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LM2840, LM2841, LM2842

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LM284x SIMPLE SWITCHER® 4.5-V to 42-V Input, 0.1-, 0.3-, or

0.6-A Output Step-Down DC/DC Regulator in Thin SOT
1 Features 3 Description
•
1 Input voltage 4.5 V to 42 V The LM284x SIMPLE SWITCHER™ devices are
PWM DC/DC buck (step-down) regulators. With an
• Output current options of 100 mA, 300 mA, and input range from 4.5 V to 42 V, they are suitable for a
600 mA wide range of applications, such as power
• Feedback pin voltage of 0.765 V conditioning from unregulated sources. They feature
• 550-kHz (X) or 1.25-MHz (Y) switching frequency a low RDSON (0.9‑Ω typical) internal switch for
maximum efficiency (85% typical). Operating
• Low shutdown IQ: 16-µA typical
frequency is fixed at 550 kHz (X option) and
• Short-circuit protected 1.25 MHz (Y option), allowing the use of small
• Internally compensated external components while still being able to have low
• Soft-start circuitry output voltage ripple. Soft start can be implemented
using the shutdown (SHDN) pin with an external RC
• Small overall solution size (SOT-6L package) circuit allowing the user to tailor the soft-start time to
• Create a custom design using the LM2840 (or a specific application.
LM2841/42) with the WEBENCH® Power Designer
The LM2840 is optimized for up to 100 mA, the
LM2841 for up to 300 mA, and the LM2842 for up to
2 Applications 600‑mA load currents. They all have a 0.765-V
• Battery-powered equipment nominal feedback voltage.
• Industrial distributed power applications Additional features include: thermal shutdown, VIN
• Portable media players undervoltage lockout, and gate-drive undervoltage
lockout. The LM284x are available in a low-profile
• Portable hand-held instruments
SOT-6L package.

Device Information(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
LM2840, LM2841,
SOT (6) 1.60 mm × 2.90 mm
LM2842
(1) For all available packages, see the orderable addendum at
the end of the data sheet.

Typical Application Circuit

CBOOT
L1 VOUT

LM2840/1/2-ADJL
VIN
VIN CB D1
SHDN SW

GND FB
R1

CIN R2 COUT

Copyright © 2016, Texas Instruments Incorporated

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
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Table of Contents
1 Features .................................................................. 1 8 Application and Implementation ........................ 11
2 Applications ........................................................... 1 8.1 Application Information............................................ 11
3 Description ............................................................. 1 8.2 Typical Applications ................................................ 11
4 Revision History..................................................... 2 9 Power Supply Recommendations...................... 16
5 Pin Configuration and Functions ......................... 3 10 Layout................................................................... 16
6 Specifications......................................................... 4 10.1 Layout Guidelines ................................................. 16
6.1 Absolute Maximum Ratings ..................................... 4 10.2 Layout Example .................................................... 16
6.2 ESD Ratings.............................................................. 4 11 Device and Documentation Support ................. 17
6.3 Recommended Operating Conditions....................... 4 11.1 Device Support...................................................... 17
6.4 Thermal Information .................................................. 4 11.2 Documentation Support ........................................ 17
6.5 Electrical Characteristics .......................................... 5 11.3 Related Links ........................................................ 17
6.6 Typical Characteristics .............................................. 7 11.4 Receiving Notification of Documentation Updates 17
7 Detailed Description .............................................. 9 11.5 Community Resources.......................................... 18
7.1 Overview ................................................................... 9 11.6 Trademarks ........................................................... 18
7.2 Functional Block Diagram ......................................... 9 11.7 Electrostatic Discharge Caution ............................ 18
7.3 Feature Description................................................... 9 11.8 Glossary ................................................................ 18
7.4 Device Functional Modes........................................ 10 12 Mechanical, Packaging, and Orderable
Information ........................................................... 18

4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision J (February 2017) to Revision K Page

• Split automotive data sheet to separate document (SNVSBE5) and remove automotive-specific content from SNVS540 .. 1
• Added SIMPLE SWITCHER® to data sheet title ................................................................................................................... 1

Changes from Revision I (September 2016) to Revision J Page

• Added new text for Pin 4 ........................................................................................................................................................ 3

• Added this new line of text in Shutdown Operation section ................................................................................................. 13

Changes from Revision H (April 2013) to Revision I Page

• Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section. ................................................................................................. 1
• Added Thermal Information table ........................................................................................................................................... 4

Changes from Revision G (April 2013) to Revision H Page

• Changed layout of National Semiconductor data sheet to TI format...................................................................................... 1

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5 Pin Configuration and Functions

DDC Package
6-Pin SOT
Top View

CB 1 6 SW
GND 2 5 VIN
FB 3 4 SHDN

Not to scale

Pin Functions
PIN
I/O DESCRIPTION
NO. NAME
1 CB I SW FET gate bias voltage. Connect CBOOT capacitor between CB and SW.
2 GND — Ground connection
Feedback pin: Set feedback voltage divider ratio with VOUT = VFB (1 + (R1 / R2)). Resistors must be from
3 FB I
100 Ω to 10 kΩ to avoid input bias errors.
Logic level shutdown input. Pull to GND to disable the device and pull high to enable the device. If this function
4 SHDN I
is not used tie to VIN . DO NOT ALLOW TO FLOAT.
5 VIN I Power input voltage pin: 4.5-V to 42-V normal operating range.
6 SW O Power FET output: Connect to inductor, diode, and CBOOT capacitor.

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6 Specifications
6.1 Absolute Maximum Ratings
(1) (2)
See
MIN MAX UNIT
VIN –0.3 45 V
SHDN –0.3 (VIN + 0.3 V) < 45 V
SW voltage –0.3 45 V
CB voltage above SW voltage 7 V
FB voltage –0.3 5 V
Power dissipation (3) Internally Limited
Maximum junction temperature 150 °C
Storage temperature, Tstg –65 150 °C

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) If Military/Aerospace specified devices are required, contact the Texas Instruments Sales Office/Distributors for availability and
specifications.
(3) The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-to-ambient thermal
resistance, RθJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated
using: PD (MAX) = (TJ(MAX) − TA) / RθJA. Exceeding the maximum allowable power dissipation causes excessive die temperature, and
the regulator goes into thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage. Thermal
shutdown engages at TJ=175°C (typical) and disengages at TJ= 155°C (typical).

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1) ±2000 V

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
Operating junction temperature (1) –40 125 °C
Input voltage VIN 4.5 42 V
SW voltage 42 V

(1) All limits specified at room temperature (TA = 25°C) unless otherwise specified. All room temperature limits are 100% production tested.
All limits at temperature extremes are ensured through correlation using standard Statistical Quality Control (SQC) methods. All limits
are used to calculate Average Outgoing Quality Level (AOQL).

6.4 Thermal Information

LM284x
THERMAL METRIC (1) DDC (SOT) UNIT
6 PINS
RθJA Junction-to-ambient thermal resistance (2) (3) 121 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 94 °C/W

(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
(2) The package thermal impedance is calculated in accordance to JESD 51-7.
(3) Thermal Resistances were simulated on a 4-layer, JEDEC board

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6.5 Electrical Characteristics

Specifications are for TJ = 25°C unless otherwise specified. Minimum and Maximum limits are specified through test, design,
or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference
purposes only. Unless otherwise stated the following conditions apply: VIN = 12 V. (1) (2) (3)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
16
SHDN = 0 V µA
TJ = −40°C to 125°C 40
1.3
IQ Quiescent current Device ON, not switching
TJ = −40°C to 125°C 1.75
mA
1.35
Device ON, no load
TJ = −40°C to 125°C 1.85

(4)
0.9
RDSON Switch ON resistance See Ω
TJ = −40°C to 125°C 1.6
0
ILSW Switch leakage current VIN = 42 V µA
TJ = −40°C to 125°C 0.5
525
LM2840 (5) mA
TJ = −40°C to 125°C 900
525
ICL Switch current limit LM2841 (5) mA
TJ = −40°C to 125°C 900
1.15
LM2842 (5) A
TJ = −40°C to 125°C 1.7
0.1
IFB Feedback pin bias current LM284[0,1,2] (6) µA
TJ = −40°C to 125°C 1
0.765
VFB FB Pin reference voltage V
TJ = −40°C to 125°C 0.747 0.782

(7)
100
tON(min) Minimum ON-time See ns
TJ = −40°C to 125°C 150
110
X option ns
TJ = −40°C to 125°C 370
tOFF(min) Minimum OFF-time
104
Y option ns
TJ = −40°C to 125°C 200
550
X option, VFB = 0.5 V
TJ = −40°C to 125°C 325 750 kHz
X option, VFB = 0 V 140
fSW Switching frequency
1.25
Y option, VFB = 0.5 V
TJ = −40°C to 125°C 0.95 1.5 MHz
Y option, VFB = 0 V 0.35
94%
X option
TJ = −40°C to 125°C 88%
DMAX Maximum duty cycle
87%
Y option
TJ = −40°C to 125°C 81%

(1) All limits specified at room temperature (TA = 25°C) unless otherwise noted. Room temperature limits are production tested. Limits at
temperature extremes are ensured through correlation using standard Statistical Quality Control (SQC) methods. Limits are used to
calculate Average Outgoing Quality Level (AOQL).
(2) Typical numbers are at 25°C and represent the most likely norm.
(3) The part numbers in this table represent both the Q1 and non-Q1 versions of the respective parts.
(4) Includes the bond wires, RDSON from VIN pin to SW pin.
(5) Current limit at 0% duty cycle. May be lower at higher duty cycle or input voltages below 6 V.
(6) Bias currents flow into pin.
(7) Minimum ON-time specified by design and simulation.
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Electrical Characteristics (continued)

Specifications are for TJ = 25°C unless otherwise specified. Minimum and Maximum limits are specified through test, design,
or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference
purposes only. Unless otherwise stated the following conditions apply: VIN = 12 V.(1)(2)(3)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
3.7
On threshold
Undervoltage lockout TJ = −40°C to 125°C 4.4
VUVP V
thresholds 3.5
Off threshold
TJ = −40°C to 125°C 3.25
1
Device ON
TJ = −40°C to 125°C 2.3
V SHDN Shutdown threshold V
0.9
Device OFF
TJ = −40°C to 125°C 0.3
0.05
VSHDN = 2.3 V (6)
Shutdown pin input bias TJ = −40°C to 125°C 1.5
ISHDN µA
current 0.02
VSHDN = 0 V
TJ = −40°C to 125°C 1.5

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6.6 Typical Characteristics

The part numbers in this section represent both the Q1 and non-Q1 versions of the respective parts.

100 100
VIN = 12V
VIN = 12V
80 80
VIN = 36V
EFFICIENCY (%)

EFFICIENCY (%)
VIN = 36V
60 60
VIN = 24V
VIN = 24V
40 40

20
20

0
0.0 0.1 0.2 0.3 0.4 0.5 0.6 0
0.0 0.1 0.2 0.3
LOAD CURRENT (A) LOAD CURRENT (A)
LM2842X VOUT = 3.3 V LM2841X VOUT = 3.3 V

Figure 1. Efficiency vs Load Current Figure 2. Efficiency vs Load Current

100
VIN = 12V
90
80
VIN = 24V
70
EFFICIENCY (%)

60
50
40
30
20
10
0
0 20 40 60 80 100 120

LOAD CURRENT (mA)

LM2840X VOUT = 8 V X option

Figure 3. Efficiency vs Load Current Figure 4. Switching Frequency vs Temperature

800
SWITCH CURRENT LIMIT (mA)

600

400

200

0
1.0 1.6 2.2 2.8 3.4 4.0

SHDN PIN VOLTAGE (V)

Soft-Start Implementation LM284[0,1]

Figure 5. Input UVLO Voltage vs Temperature Figure 6. Switch Current Limit vs SHDN Pin Voltage

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Typical Characteristics (continued)

The part numbers in this section represent both the Q1 and non-Q1 versions of the respective parts.
1.2
SWITCH CURRENT LIMIT (A)

1.0

0.9

0.7

0.6

0.4
1.1 1.7 2.3 2.8 3.4 4.0

SHDN PIN VOLTAGE (V)

Soft-Start Implementation LM2842

Figure 7. Switch Current Limit vs SHDN Pin Voltage Figure 8. SHDN Pin Current vs SHDN Pin Voltage

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7 Detailed Description

7.1 Overview
The LM284x SIMPLE SWITCHER® regulators are easy-to-use, non-synchronous, step-down DC/DC converters
with a wide input voltage range up to 42 V. The devices are capable of delivering up to 100‑mA, 300-mA, or 600-
mA DC load current with excellent line and load regulation. These devices are available in fixed frequency of 550
kHz and 1.25 MHz. The family requires few external components, and the pin arrangement was designed for
simple, optimum PCB layout.

7.2 Functional Block Diagram

CB

VIN
+ Max Duty
+ Cycle Limit
OSC
Inductor
Current
SET DC Measurement
FB LIMIT

+
PWM BUCK FET
Comp RESET DRIVE Driver
- SW
UVLO
-
Error TSD
Amp
+ UVLO
Comp
Voltage
Soft Thermal Regulator
Bandgap Shutdown BG
Start

GND

SHDN
Copyright © 2016, Texas Instruments Incorporated

7.3 Feature Description

7.3.1 Protection
The LM284x have dedicated protection circuitry running during normal operation to protect the IC. The thermal
shutdown circuitry turns off the power device when the die temperature reaches excessive levels. The UVLO
comparator protects the power device during supply power start-up and shutdown to prevent operation at
voltages less than the minimum input voltage. A gate drive (CB) undervoltage lockout is included to ensure that
there is enough gate drive voltage to drive the MOSFET before the device tries to start switching. The LM284x
also feature a shutdown mode decreasing the supply current to approximately 16 µA.

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7.4 Device Functional Modes

7.4.1 Continuous Conduction Mode
The LM284x contain a current-mode, PWM buck regulator. A buck regulator steps the input voltage down to a
lower output voltage. In continuous conduction mode (when the inductor current never reaches zero at steady-
state operation), the buck regulator operates in two cycles. The power switch is connected between VIN and SW.
In the first cycle of operation the transistor is closed and the diode is reverse biased. Energy is collected in the
inductor and the load current is supplied by COUT and the rising current through the inductor. During the second
cycle the transistor is open and the diode is forward biased due to the fact that the inductor current cannot
instantaneously change direction. The energy stored in the inductor is transferred to the load and output
capacitor. The ratio of these two cycles determines the output voltage. The output voltage is defined
approximately as shown in Equation 1.
D = VOUT / VIN (1)
D’ = (1 – D)
where
• D is the duty cycle of the switch (2)
D and D' are required for design calculations.

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8 Application and Implementation

NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LM284x are step-down DC/DC regulators. They are typically used to convert a higher DC voltage to a lower
DC voltage with a maximum output current of 100 mA, 300 mA, or 600 mA. The following design procedure can
be used to select components for the LM284x . Alternately, the WEBENCH® software may be used to generate
complete designs. When generating a design, the WEBENCH software uses iterative design procedure and
accesses comprehensive databases of components. See ti.com and Detailed Design Procedure for more details

8.2 Typical Applications

L1
CBOOT 3.3V OUT
15 PH

LM2840/1/2-ADJL 0.1 PF
4.5V to 42V IN C
VIN D1
B
MA2YD26
SHDN SW
R1
GND FB
3.4k
CIN R2 COUT
2.2 PF 1.02k 10 PF

Copyright © 2016, Texas Instruments Incorporated

Figure 9. Application Circuit With 3.3-V Output Voltage at 100 mA

8.2.1 Design Requirements

Table 1 lists the design parameters for this example.

Table 1. Design Parameters

DESIGN PARAMETER EXAMPLE VALUE
Input voltage 4.5 V to 42 V
Output voltage 3.3 V
Output current 0.1 A

8.2.2 Detailed Design Procedure

8.2.2.1 Custom Design With WEBENCH® Tools

Click here to create a custom design using the LM2840 device with the WEBENCH® Power Designer.
1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements.
2. Optimize the design for key parameters such as efficiency, footprint, and cost using the optimizer dial.
3. Compare the generated design with other possible solutions from Texas Instruments.
The WEBENCH Power Designer provides a customized schematic along with a list of materials with real-time
pricing and component availability.
In most cases, these actions are available:
• Run electrical simulations to see important waveforms and circuit performance

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• Run thermal simulations to understand board thermal performance

• Export customized schematic and layout into popular CAD formats
• Print PDF reports for the design, and share the design with colleagues
Get more information about WEBENCH tools at www.ti.com/WEBENCH.
This section presents guidelines for selecting external components.

8.2.2.2 Setting the Output Voltage

The output voltage is set using the feedback pin and a resistor divider connected to the output as shown in
Typical Application Circuit. The feedback pin voltage 0.765 V, so the ratio of the feedback resistors sets the
output voltage according to Equation 3:
VOUT = 0.765 V (1 + (R1 / R2)) (3)
Typically R2 is given as 100 Ω to 10 kΩ for a starting value. To solve for R1 given R2 and VOUT, use Equation 4:
R1 = R2 ((VOUT / 0.765 V) – 1) (4)

8.2.2.3 Inductor Selection

The most critical parameters for the inductor are the inductance, peak current, and the DC resistance. The
inductance is related to the peak-to-peak inductor ripple current, the input and the output voltages.
(VIN - VOUT)VOUT
L=
VIN x IRIPPLE x fSW (5)
A higher value of ripple current reduces inductance, but increases the conductance loss, core loss, and current
stress for the inductor and switch devices. It also requires a bigger output capacitor for the same output voltage
ripple requirement. A reasonable value is setting the ripple current to be 30% of the DC output current. Because
the ripple current increases with the input voltage, the maximum input voltage is always used to determine the
inductance. The DC resistance of the inductor is a key parameter for the efficiency. Lower DC resistance is
available with a bigger winding area. A good tradeoff between the efficiency and the core size is letting the
inductor copper loss equal 2% of the output power. See Selecting Inductors for Buck Converters for more
information on selecting inductors. A good starting point for most applications is a 10 µH to 22 µH with 1.1 A or
greater current rating for the LM2842 or a 0.7 A or greater current rating for the LM284x . Using such a rating
enables the device to current limit without saturating the inductor. This is preferable to the device going into
thermal shutdown mode and the possibility of damaging the inductor if the output is shorted to ground or other
long-term overload.

Table 2. Recommended Inductors

MANUFACTURER INDUCTOR CONTACT INFORMATION
www.coilcraft.com
Coilcraft LPS4018, DO1608C, DO3308, and LPO2506 series
800-3222645
MuRata LQH55D and LQH66S series www.murata.com
Coiltronics MP2 and MP2A series www.cooperbussman.com

8.2.2.4 Input Capacitor

A low ESR ceramic capacitor (CIN) is needed between the VIN pin and GND pin. This capacitor prevents large
voltage transients from appearing at the input. Use a 2.2-µF to 10-µF value with X5R or X7R dielectric.
Depending on construction, a ceramic capacitor’s value can decrease up to 50% of its nominal value when rated
voltage is applied. Consult with the capacitor manufacturer's data sheet for information on capacitor derating over
voltage and temperature.

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8.2.2.5 Output Capacitor

The selection of COUT is driven by the maximum allowable output voltage ripple. The output ripple in the constant
frequency, PWM mode is approximated by Equation 6.
VRIPPLE = IRIPPLE (ESR + (1 / (8fSWCOUT))) (6)
The ESR term usually plays the dominant role in determining the voltage ripple. Low-ESR ceramic capacitors are
recommended. Capacitors in the range of 22 µF to 100 µF are a good starting point with an ESR of 0.1 Ω or
less.

Table 3. Recommended Input and Output Capacitors

MANUFACTURER CAPACITOR CONTACT INFORMATION
www.vishay.com
Vishay Sprague 293D, 592D, and 595D series tantalum
407-324-4140
www.t-yuden.com
Taiyo Yuden High capacitance MLCC ceramic
408-573-4150
ESRD seriec Polymer Aluminum Electrolytic
Cornell Dubilier www.cde.com
SPV and AFK series V-chip series
MuRata High capacitance MLCC ceramic www.murata.com

8.2.2.6 Bootstrap Capacitor

A 0.15-µF ceramic capacitor or larger is recommended for the bootstrap capacitor CBOOT). For applications where
the input voltage is less than twice the output voltage a larger capacitor is recommended, generally 0.15 µF to 1
µF to ensure plenty of gate drive for the internal switches and a consistently low RDSON.

8.2.2.7 Soft-Start Components

The devices have circuitry that is used in conjunction with the SHDN pin to limit the inrush current on start-up of
the DC/DC switching regulator. The SHDN pin in conjunction with a RC filter is used to tailor the soft start for a
specific application. When a voltage applied to the SHDN pin is between 0 V and up to 2.3 V it causes the cycle-
by-cycle current limit in the power stage to be modulated for minimum current limit at 0 V up to the rated current
limit at 2.3 V. Thus controlling the output rise time and inrush current at start-up. The resistor value must be
selected so the current injected into the SHDN pin is greater then the leakage current of the SHDN pin (1.5 µA)
when the voltage at SHDN is equal or greater then 2.3 V.

8.2.2.8 Shutdown Operation

The SHDN pin of the LM284x is designed so that it may be controlled using 2.3 V or higher logic signals. If the
shutdown function is not to be used the SHDN pin may be tied to VIN. This input must not be allowed to float
The maximum voltage to the SHDN pin should not exceed 42 V. If the use of a higher voltage is desired due to
system or other constraints it may be used; however, a 100 kΩ or larger resistor is recommended between the
applied voltage and the SHDN pin to protect the device.

8.2.2.9 Schottky Diode

The breakdown voltage rating of the diode (D1) is preferred to be 25% higher than the maximum input voltage.
The current rating for the diode must be equal to the maximum output current for best reliability in most
applications. In cases where the duty cycle is greater than 50%, the average diode current is lower. In this case it
is possible to use a diode with a lower average current rating, approximately (1 – D)IOUT; however, the peak
current rating should be higher than the maximum load current. A 0.5-A to 1-A rated diode is a good starting
point.

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8.2.3 Application Curves

VIN = 12 V IOUT = 200 mA VIN = 12 V IOUT = 300 mA to 200 mA to 300 mA

VOUT = 3.3 V Top trace: VOUT, 10 mV/div, AC-Coupled VOUT = 3.3 V Top trace: VOUT, 20 mV/div, AC-Coupled
T = 1 µs/div Bottom trace: SW, 5 V/div, DC-Coupled T = 200 µs/div Bottom trace: IOUT, 100 mA/div, DC-Coupled

Figure 10. Switching Node and Output Voltage Waveforms Figure 11. Load Transient Waveforms

VIN = 12 V IOUT = 50 mA
VOUT = 3.3 V Top trace: VOUT, 1V/div, DC-Coupled
T = 40 µs/div Bottom trace: SHDN, 2V/div, DC-Coupled

Figure 12. Start-Up Waveform

8.2.4 Other Application Circuits

Figure 13 to Figure 16 show application circuit examples using the LM284x devices. Customers must fully
validate and test these circuits before implementing a design based on these examples. Unless otherwise noted,
the design procedures in are applicable to these designs.
L1
CBOOT 5V OUT
15 PH

LM2840/1/2-ADJL 0.15 PF
7V to 42V IN
VIN CB D1
MA2YD26
SHDN SW
R1
GND FB
5.62k
CIN R2 COUT
2.2 PF 1.02k 47 PF

Copyright © 2016, Texas Instruments Incorporated

Figure 13. Step-Down Converter With 5-V Output Voltage

14 Submit Documentation Feedback Copyright © 2009–2019, Texas Instruments Incorporated

Product Folder Links: LM2840 LM2841 LM2842

 LM2840, LM2841, LM2842
www.ti.com SNVS540K – MARCH 2009 – REVISED APRIL 2019

L1
CBOOT 47 PH 12V OUT

LM2840/1/2-ADJL 0.15 PF
15V to 42V IN
CB D1
VIN
MA2YD26
SHDN SW
R1
GND FB
14.7k
CIN R2 COUT
2.2 PF 1k 22 PF

Copyright © 2016, Texas Instruments Incorporated

Figure 14. Step-Down Converter With 12-V Output Voltage

L1
CBOOT 47 PH 15V OUT

LM2840/1/2-ADJL 0.15 PF
18V to 42V IN
D1
VIN CB
MA2YD26
SHDN SW
R1
GND FB
28k
CIN R2 COUT
2.2 PF 1.5k 22 PF

Copyright © 2016, Texas Instruments Incorporated

Figure 15. Step-Down Converter With 15-V Output Voltage

L1
CBOOT 0.8V OUT
10 PH

LM2840/1/2-ADJL 0.15 PF
4.5V to 12V IN
VIN D1
CB
MA2YD26
SHDN SW
R1
GND FB
30.9
CIN R2 COUT
2.2 PF 787 100 PF

Copyright © 2016, Texas Instruments Incorporated

Figure 16. Step-Down Converter With 0.8-V Output Voltage

Copyright © 2009–2019, Texas Instruments Incorporated Submit Documentation Feedback 15

Product Folder Links: LM2840 LM2841 LM2842
LM2840, LM2841, LM2842
SNVS540K – MARCH 2009 – REVISED APRIL 2019 www.ti.com

9 Power Supply Recommendations

The LM284x are designed to operate from an input voltage supply range between 4 V and 42 V. This input
supply must be able to withstand the maximum input current and maintain a voltage above 4.5 V. The resistance
of the input supply rail must be low enough that an input current transient does not cause a drop at the device
supply voltage high enough to cause a false UVLO fault triggering and system reset. If the input supply is located
more than a few inches from the device, additional bulk capacitance may be required in addition to the ceramic
input capacitors.

10 Layout

10.1 Layout Guidelines

To reduce problems with conducted noise pickup, the ground side of the feedback network should be connected
directly to the GND pin with its own connection. The feedback network, resistors R1 and R2, must be kept close
to the FB pin, and away from the inductor to minimize coupling noise into the feedback pin. The input bypass
capacitor CIN must be placed close to the VIN pin. This reduces copper trace resistance, which effects input
voltage ripple of the IC. The inductor L1 must be placed close to the SW pin to reduce EMI and capacitive
coupling. The output capacitor, COUT must be placed close to the junction of L1 and the diode D1. The L1, D1,
and COUT trace must be as short as possible to reduce conducted and radiated noise and increase overall
efficiency. The ground connection for the diode, CIN, and COUT must be as small as possible and tied to the
system ground plane in only one spot (preferably at the COUT ground point) to minimize conducted noise in the
system ground plane. See Layout Guidelines for Switching Power Supplies for more detail on switching power
supply layout considerations.

10.2 Layout Example

Figure 17. Recommended Layout

16 Submit Documentation Feedback Copyright © 2009–2019, Texas Instruments Incorporated

Product Folder Links: LM2840 LM2841 LM2842

 LM2840, LM2841, LM2842
www.ti.com SNVS540K – MARCH 2009 – REVISED APRIL 2019

11 Device and Documentation Support

11.1 Device Support

11.1.1 Third-Party Products Disclaimer
TI'S PUBLICATION OF INFORMATION REGARDING THIRD-PARTY PRODUCTS OR SERVICES DOES NOT
CONSTITUTE AN ENDORSEMENT REGARDING THE SUITABILITY OF SUCH PRODUCTS OR SERVICES
OR A WARRANTY, REPRESENTATION OR ENDORSEMENT OF SUCH PRODUCTS OR SERVICES, EITHER
ALONE OR IN COMBINATION WITH ANY TI PRODUCT OR SERVICE.

11.1.2 Development Support

11.1.2.1 Custom Design With WEBENCH® Tools

Click here to create a custom design using the LM2840 device with the WEBENCH® Power Designer.
1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements.
2. Optimize the design for key parameters such as efficiency, footprint, and cost using the optimizer dial.
3. Compare the generated design with other possible solutions from Texas Instruments.
The WEBENCH Power Designer provides a customized schematic along with a list of materials with real-time
pricing and component availability.
In most cases, these actions are available:
• Run electrical simulations to see important waveforms and circuit performance
• Run thermal simulations to understand board thermal performance
• Export customized schematic and layout into popular CAD formats
• Print PDF reports for the design, and share the design with colleagues
Get more information about WEBENCH tools at www.ti.com/WEBENCH.

11.2 Documentation Support

11.2.1 Related Documentation
For related documentation, see the following:
• AN-1197 Selecting Inductors for Buck Converters (SNVA038)
• AN-1149 Layout Guidelines for Switching Power Supplies (SNVA021)

11.3 Related Links

The table below lists quick access links. Categories include technical documents, support and community
resources, tools and software, and quick access to order now.

Table 4. Related Links

TECHNICAL TOOLS & SUPPORT &
PARTS PRODUCT FOLDER ORDER NOW
DOCUMENTS SOFTWARE COMMUNITY
LM2840 Click here Click here Click here Click here Click here
LM2841 Click here Click here Click here Click here Click here
LM2842 Click here Click here Click here Click here Click here

11.4 Receiving Notification of Documentation Updates

To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.

Copyright © 2009–2019, Texas Instruments Incorporated Submit Documentation Feedback 17

Product Folder Links: LM2840 LM2841 LM2842
LM2840, LM2841, LM2842
SNVS540K – MARCH 2009 – REVISED APRIL 2019 www.ti.com

11.5 Community Resources

The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.

11.6 Trademarks
SIMPLE SWITCHER, E2E are trademarks of Texas Instruments.
WEBENCH, SIMPLE SWITCHER are registered trademarks of Texas Instruments.
All other trademarks are the property of their respective owners.
11.7 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.

11.8 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.

12 Mechanical, Packaging, and Orderable Information

The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.

18 Submit Documentation Feedback Copyright © 2009–2019, Texas Instruments Incorporated

Product Folder Links: LM2840 LM2841 LM2842

 PACKAGE OPTION ADDENDUM

www.ti.com 10-Dec-2020

PACKAGING INFORMATION

Orderable Device Status Package Type Package Pins Package Eco Plan Lead finish/ MSL Peak Temp Op Temp (°C) Device Marking Samples
(1) Drawing Qty (2) Ball material (3) (4/5)
(6)

LM2840XMK-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 SE8B

LM2840XMKX-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 3000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 SE8B

LM2840YMK-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 SF1B

LM2841XMK-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 STFB

LM2841XMKX-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 3000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 STFB

LM2841YMK-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 STTB

LM2841YMKX-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 3000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 STTB

LM2842XMK-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 STVB

LM2842XMKX-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 3000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 STVB

LM2842YMK-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 1000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 STXB

LM2842YMKX-ADJL/NOPB ACTIVE SOT-23-THIN DDC 6 3000 RoHS & Green SN Level-1-260C-UNLIM -40 to 125 STXB

(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.

(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based
flame retardants must also meet the <=1000ppm threshold requirement.

(3)
MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

Addendum-Page 1
 PACKAGE OPTION ADDENDUM

www.ti.com 10-Dec-2020

(4)
There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

(5)
Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.

(6)
Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two
lines if the finish value exceeds the maximum column width.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information
provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and
continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.
TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

OTHER QUALIFIED VERSIONS OF LM2840, LM2841, LM2842 :

• Automotive: LM2840-Q1, LM2841-Q1, LM2842-Q1

NOTE: Qualified Version Definitions:

• Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects

Addendum-Page 2
 PACKAGE MATERIALS INFORMATION

www.ti.com 9-Aug-2022

TAPE AND REEL INFORMATION

REEL DIMENSIONS TAPE DIMENSIONS

K0 P1

B0 W
Reel
Diameter
Cavity A0
A0 Dimension designed to accommodate the component width
B0 Dimension designed to accommodate the component length
K0 Dimension designed to accommodate the component thickness
W Overall width of the carrier tape
P1 Pitch between successive cavity centers

Reel Width (W1)

QUADRANT ASSIGNMENTS FOR PIN 1 ORIENTATION IN TAPE

Sprocket Holes

Q1 Q2 Q1 Q2

Q3 Q4 Q3 Q4 User Direction of Feed

Pocket Quadrants

*All dimensions are nominal

Device Package Package Pins SPQ Reel Reel A0 B0 K0 P1 W Pin1
Type Drawing Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
LM2840XMK-ADJL/NOPB SOT-23- DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
THIN
LM2840XMKX- SOT-23- DDC 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
ADJL/NOPB THIN
LM2840YMK-ADJL/NOPB SOT-23- DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
THIN
LM2841XMK-ADJL/NOPB SOT-23- DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
THIN
LM2841XMKX- SOT-23- DDC 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
ADJL/NOPB THIN
LM2841YMK-ADJL/NOPB SOT-23- DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
THIN
LM2841YMKX- SOT-23- DDC 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
ADJL/NOPB THIN
LM2842XMK-ADJL/NOPB SOT-23- DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
THIN
LM2842XMKX- SOT-23- DDC 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
ADJL/NOPB THIN

Pack Materials-Page 1
 PACKAGE MATERIALS INFORMATION

www.ti.com 9-Aug-2022

Device Package Package Pins SPQ Reel Reel A0 B0 K0 P1 W Pin1

Type Drawing Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant
(mm) W1 (mm)
LM2842YMK-ADJL/NOPB SOT-23- DDC 6 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
THIN
LM2842YMKX- SOT-23- DDC 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
ADJL/NOPB THIN

Pack Materials-Page 2
 PACKAGE MATERIALS INFORMATION

www.ti.com 9-Aug-2022

TAPE AND REEL BOX DIMENSIONS

Width (mm)
H
W

*All dimensions are nominal

Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LM2840XMK-ADJL/NOPB SOT-23-THIN DDC 6 1000 210.0 185.0 35.0
LM2840XMKX- SOT-23-THIN DDC 6 3000 210.0 185.0 35.0
ADJL/NOPB
LM2840YMK-ADJL/NOPB SOT-23-THIN DDC 6 1000 210.0 185.0 35.0
LM2841XMK-ADJL/NOPB SOT-23-THIN DDC 6 1000 210.0 185.0 35.0
LM2841XMKX- SOT-23-THIN DDC 6 3000 210.0 185.0 35.0
ADJL/NOPB
LM2841YMK-ADJL/NOPB SOT-23-THIN DDC 6 1000 210.0 185.0 35.0
LM2841YMKX- SOT-23-THIN DDC 6 3000 208.0 191.0 35.0
ADJL/NOPB
LM2842XMK-ADJL/NOPB SOT-23-THIN DDC 6 1000 208.0 191.0 35.0
LM2842XMKX- SOT-23-THIN DDC 6 3000 208.0 191.0 35.0
ADJL/NOPB
LM2842YMK-ADJL/NOPB SOT-23-THIN DDC 6 1000 208.0 191.0 35.0
LM2842YMKX- SOT-23-THIN DDC 6 3000 208.0 191.0 35.0
ADJL/NOPB

Pack Materials-Page 3
 PACKAGE OUTLINE
DDC0006A SCALE 4.000
SOT-23 - 1.1 max height
SMALL OUTLINE TRANSISTOR

3.05 1.1
2.55 0.7
1.75 0.1 C
B A
1.45
PIN 1
INDEX AREA

1
6

4X 0.95

3.05
1.9
2.75

4
3 4X 0 -15

0.5 0.1
6X TYP
0.3 0.0
0.2 C A B

4X 4 -15

C
0 -8 TYP

SEATING PLANE 0.25

0.20
TYP GAGE PLANE
0.12
0.6
TYP
0.3

4214841/E 08/2024

NOTES:

1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. Reference JEDEC MO-193.

www.ti.com
 EXAMPLE BOARD LAYOUT
DDC0006A SOT-23 - 1.1 max height
SMALL OUTLINE TRANSISTOR

SYMM
6X (1.1)
1

6X (0.6) 6

SYMM

4X (0.95)

4
3

(R0.05) TYP
(2.7)

LAND PATTERN EXAMPLE

EXPLOSED METAL SHOWN
SCALE:15X

METAL UNDER SOLDER MASK

SOLDER MASK METAL SOLDER MASK OPENING
OPENING

EXPOSED METAL

EXPOSED METAL

0.07 MAX 0.07 MIN

ARROUND ARROUND

NON SOLDER MASK SOLDER MASK

DEFINED DEFINED

SOLDERMASK DETAILS

4214841/E 08/2024

NOTES: (continued)

4. Publication IPC-7351 may have alternate designs.

5. Solder mask tolerances between and around signal pads can vary based on board fabrication site.

www.ti.com
 EXAMPLE STENCIL DESIGN
DDC0006A SOT-23 - 1.1 max height
SMALL OUTLINE TRANSISTOR

SYMM
6X (1.1)
1

6X (0.6) 6

SYMM

4X(0.95)

4
3

(R0.05) TYP
(2.7)

SOLDER PASTE EXAMPLE

BASED ON 0.125 THICK STENCIL
SCALE:15X

4214841/E 08/2024

NOTES: (continued)

6. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
7. Board assembly site may have different recommendations for stencil design.

www.ti.com
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