Preliminary Datasheet LP6216

High Efficiency 3A Boost DC/DC Convertor

General Description Features

The LP6216 is a current mode boost DC-DC converter.  Up to 94% efficiency

Its PWM circuitry with built-in 3A current power  Shut-down current:1uA

MOSFET makes this converter highly power efficiently.  Input and Output voltage Up to 24V
The LP6216 implements a constant frequency 1MHz
 Internal Compensation, Soft-start
PWM control scheme. The high frequency PWM
 1MHz fixed frequency switching
operation also saves board space by reducing external
 High switch on current:3A
component sizes. The LP6216 features automatic
shifting to pulse frequency modulation mode at light  Available in SOT23-6 Package

loads.Highly integration and internal compensation

network minimizes as 6 external component counts.
Optimized operation frequency can meet the Typical Application Circuit
requirement of small LC filters value and low operation
VIN VOUT
current with high efficiency. 4.7uH Diode

The LP6216 includes under-voltage lockout, current C1 C2

22uF 22uF
limiting, and thermal overload protection to prevent R1
SW
110K
damage in the event of an output overload. The VIN C3
NC
LP6216 is available in a small 6-pin SOT23-6 R3 FB
500K R2
package. 15K
EN
Order Information GND

LP6216

F: Pb-Free
Marking Information
Package Type
B6: SOT23-6 Device Marking Package Shipping
Feedback Voltage LPS
LP6216B6F SOT23-6 3K/REEL
Default: 0.6V 5EYWX
A: 1.24V
Marking indication:
Y:Production year W:Production period X:Production batch

Applications
 Battery products

 Host Products

 Panel

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 Preliminary Datasheet LP6216

Functional Pin Description

Package Type Pin Configurations

6 5 4

SOT23-6 LP6216

1 2 3

Pin Name Description

1 SW switching pin.

2 GND Ground.
Regulation Feedback Input. Connect to an external resistive voltage divider from the
3 FB
output to FB to set the output voltage.
Regulator ON/OFF Control Input. A logic high input(VEN>1.4V) turns on the regulator. A
4 EN
logic low input(VEN<0.4V) puts the LP6216 into low current shutdown mode.
5 VIN Power Supply pin.

6 NC No connecter.

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 Preliminary Datasheet LP6216

Function Block Diagram

VIN EN
SHORT
CIRCUIT
COMP. UVLO
0.3V +
SHUTDOWN
- CIRCUITRY

10μA
OVP SW

Error
Amp.
OTP
FB -

0.6V/ +
CONTROL
1.24V - AND DRIVER
LOGIC
+
PWM
COMP.

SOFT
START
+

- GND
CURRENT
SENSE
SLOPE Σ AMP.
OSCILLATOR
COMPENSASION

Absolute Maximum Ratings Note 1

 VIN to GND ---------------------------------------------------------------------------------------------------------------- 26V
 SW to GND ---------------------------------------------------------------------------------------------------------------- 30V
 EN to GND ----------------------------------------------------------------------------------------------------------------- 26V
 Other Pin Voltage to GND ----------------------------------------------------------------------------------------------- 6V
 Maximum Junction Temperature ---------------------------------------------------------------------------------- 150°C
 Operating Ambient Temperature Range (TA) -------------------------------------------------------- -40℃ to 85°C
 Maximum Soldering Temperature (at leads, 10 sec) -------------------------------------------------------- 260°C

Note 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress
ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational
sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.

Thermal Information
 Maximum Power Dissipation (PD,TA=25℃) -------------------------------------------------------------------- 0.45W
 Thermal Resistance (JA) ----------------------------------------------------------------------------------------- 250℃/W

ESD Susceptibility
 HBM(Human Body Mode) --------------------------------------------------------------------------------------------- 2KV
 MM(Machine Mode) --------------------------------------------------------------------------------------------------- 200V

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 Preliminary Datasheet LP6216

Electrical Characteristics
(VIN=3.3V, VOUT=5V, CIN=22uF, COUT=22uF, L=4.7uH, R1=110K, R2=15K)
Parameter Condition Min Typ Max Units

Supply Voltage VIN 2.5 24 V

Output Voltage Range VOUT 2.5 24 V

Supply Current(Shutdown) ISD VEN=0V, VSW=5V 1 μA

Supply Current IQ 0.35 mA

LP6216B6F 0.588 0.6 0.612 V

Feedback Voltage VFB
LP6216AB6F 1.215 1.24 1.265 V

Feedback Input Current IFB VFB=1.2V 50 nA

Switching Frequency fOSC 1 MHz

Maximum Duty Cycle 85 92 98 %

EN Input Low Voltage VEN-L 0.4 V

EN Input High Voltage VEN-H 1.4 V

EN input current IEN VEN=5 1 uA

Switch MOSFET Current Limit ISW 3 A

High-side On Resistance RDS(ON) VOUT=5V 150 mΩ

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 Preliminary Datasheet LP6216

Typical Operating Characteristics

(CIN=22uF,COUT=22uF,L=4.7uH,TA=25℃,unless otherwise noted)

Efficiency VS. Iout @Vout=5V Efficiency VS. Iout @Vout=10V

100 100
95 95
90 90
85 85

Efficiency(%)
Efficiency(%)

80 80
75 75
70 70
65 65
VIN=3V VIN=3V
60 60
VIN=3.3V VIN=3.3V
55 55
VIN=3.7V VIN=3.7V
50 50
0.0 0.5 1.0 1.5 2.0 0.0 0.2 0.4 0.6 0.8
Iout(A) Iout(A)

VIN=3V,VOUT=5V,IOUT=50mA,CH1=VSW,CH2=△VOUT VIN=3V,VOUT=5V, IOUT=200mA,CH1= VSW,CH2=△VOUT

VIN=3V,VOUT=5V,IOUT=500mA,CH1= VSW,CH2=△VOUT VIN=3V,VOUT=5V, IOUT=1A,CH1= VSW,CH2=△VOUT

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 Preliminary Datasheet LP6216

Operation Information Current Limitation

The LP6216 uses a fixed frequency, peak current The internal power-MOS switch current is monitored
mode boost regulator architecture to regulate voltage cycle-by-cycle and is limited to the value not exceed
at the feedback pin. At the start of each oscillator 3A(Typ.). When the switch current reaches the
cycle the MOSFET is turned on through the control limited value, the internal power-MOS is turned off
circuitry. To prevent sub-harmonic oscillations at immediately until the next cycle. Keep traces at this
duty cycles greater than 50 percent, a stabilizing pin as short as possible. Do not put capacitance at
ramp is added to the output of the current sense this pin.
amplifier and the result is fed into the negative input
Inductor Selection
of the PWM comparator. When this voltage equals
For a better efficiency in high switching frequency
The output voltage of the error amplifier the power
converter, the inductor selection has to use a proper
MOSFET is turned off. The voltage at the output of
core material such as ferrite core to reduce the core
the error amplifier is an amplified version of the
loss and choose low ESR wire to reduce copper loss.
difference between the 0.6V bandgap reference
The most important point is to prevent the core
voltage and the feedback voltage. In this way the
saturated when handling the maximum peak current.
peak current level keeps the output in regulation. If
Using a shielded inductor can minimize radiated
the feedback voltage starts to drop, the output of the
noise in sensitive applications. The maximum peak
error amplifier increases. These results in more
inductor current is the maximum input current plus
current to flow through the power MOSFET, thus
the half of inductor ripple current. The calculated
increasing the power delivered to the output.
peak current has to be smaller than the current
TheLP6216 has internal soft start to limit the amount
limitation in the electrical characteristics. A typical
of input current at startup and to also limit the amount
setting of the inductor ripple current is 20% to 40% of
of overshoot on the output.
the maximum input current. If the selection is 40%,
Setting the Output Voltage
the maximum peak inductor current is
Set the output voltage by selecting the resistive
voltage divider ratio. The voltage divider drops the
output voltage to the 0.6V feedback voltage. Use a
100K resistor for R2 of the voltage divider. Determine
The minimum inductance value is derived from the
the high-side resistor R1 by the equation:
following equation:
VOUT = ( R1 / R2 + 1 ) x VFB

Depending on the application, the recommended

inductor value is between 2.2μH to 10μH.

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 Preliminary Datasheet LP6216

Diode Selection Layout Guideline

To achieve high efficiency, Schottky diode is good For high frequency switching power supplies, the
choice for low forward drop voltage and fast PCB layout is important step in system application
switching time. The output diode rating should be design. In order to let IC achieve good regulation,
able to handle the maximum output voltage, average high efficiency and stability, it is strongly
power dissipation and the pulsating diode peak recommended the power components should be
current. placed as close as possible. The set races should be
wide and short. The feedback pin and then works of
Input Capacitor Selection
feedback and compensation should keep away from
For better input bypassing, low-ESR ceramic
the power loops, and be shielded with a ground trace
capacitors are recommended for performance. A
or plane to prevent noise coupling.Input and Output
22μF input capacitor is sufficient for most
capacitors should be placed close to the IC and
applications. For a lower output power requirement
connected to ground plane to reduce noise coupling.
application, this value can be decreased.

Output Capacitor Selection

For lower output voltage ripple, low-ESR ceramic

capacitors are recommended. The tantalum
capacitors can be used as well, but the ESR is bigger
than ceramic capacitor. The output voltage ripple
consists of two components: one is the pulsating
output ripple current flows through the ESR, and the
other is the capacitive ripple caused by charging and
discharging.

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 Preliminary Datasheet LP6216

Packaging Information

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