MIC2033

High-Accuracy, High-Side, Fixed

Current Limit Power Switch

General Description Features

The MIC2033 is a high-side MOSFET power distribution  ±5% current limit accuracy
switch providing increased system reliability utilizing 5%  Input supply range from 2.5V to 5.5V
current limit accuracy.
 Low quiescent current: 100µA typical (switch ON)
The MIC2033 has an operating input voltage range from
 75mΩ typical RDS(ON) at 5V
2.5V to 5.5V, is internally current limited and has thermal
shutdown to protect the device and system. The MIC2033  Current limit options: 0.5A, 0.8A, 1A, and 1.2A
is offered with either active-high or active-low logic level  Soft-start control via an external capacitor
enable input controls, has an open drain fault status output  Undervoltage lockout (UVLO)
flag with a built-in 32ms delay that asserts low during over  Fast response time (10µs) to short circuit loads
current or thermal shutdown conditions.
 Fault status output flag
The MIC2033 is available in several different fixed current
limit options: 0.5A, 0.8A, 1A, and 1.2A. A capacitor  Logic controlled enable (active-high, active-low)
adjustable soft-start circuit minimizes inrush current in  Thermal shutdown
applications where high capacitive loads are used.  Pin compatible with MIC2005
The MIC2033 is offered in both 6-pin SOT-23 and 6-pin  6-pin 2mm  2mm thin DFN and 6-pin SOT-23
2mm x 2mm thin DFN packages. The MIC2033 has an packages
operating junction temperature range of 40°C to +125°C.  Junction temperature range from 40°C to +125°C
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com.
Applications
 USB peripherals and USB 2.0/3.0 compatible
 DTV/STB
 Notebooks and consumer electronics
 General purpose power distribution

____________________________________________________________________________________________________________
Typical Application

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

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Ordering Information
Part Number Top Mark Current Limit Enable Package
MIC2033-05AYM6 35A 0.5A Active High SOT-23-6L
MIC2033-05BYM6 35B 0.5A Active Low SOT-23-6L
MIC2033-05AYMT 3A5 0.5A Active High 6-pin 2mm x 2mm Thin DFN
MIC2033-05BYMT 3B5 0.5A Active Low 6-pin 2mm x 2mm Thin DFN
MIC2033-55AYM6* 55A 0.55A Active High SOT-23-6L
MIC2033-55AYMT* 5A5 0.55A Active High 6-pin 2mm x 2mm Thin DFN
MIC2033-08AYM6 38A 0.8A Active High SOT-23-6L
MIC2033-08BYM6 38B 0.8A Active Low SOT-23-6L
MIC2033-08AYMT 3A8 0.8A Active High 6-pin 2mm x 2mm Thin DFN
MIC2033-08BYMT 3B8 0.8A Active Low 6-pin 2mm x 2mm Thin DFN
MIC2033-10AYM6 31A 1.0A Active High SOT-23-6L
MIC2033-10BYM6 31B 1.0A Active Low SOT-23-6L
MIC2033-10AYMT 3A1 1.0A Active High 6-pin 2mm x 2mm Thin DFN
MIC2033-10BYMT 3B1 1.0A Active Low 6-pin 2mm x 2mm Thin DFN
MIC2033-12AYM6 32A 1.2A Active High SOT-23-6L
MIC2033-12BYM6 32B 1.2A Active Low SOT-23-6L
MIC2033-12AYMT 3A2 1.2A Active High 6-pin 2mm x 2mm Thin DFN
MIC2033-12BYMT 3B2 1.2A Active Low 6-pin 2mm x 2mm Thin DFN

Notes:
1. Under bar symbol ( _ ) may not be to scale.
2. Thin DFN is a GREEN RoHS compliant package. Lead finish is NiPdAu. Mold compound is Halogen Free.
3. * Contact Micrel for availability.

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Pin Configuration

SOT-23 6-Lead (M6) 2mm x 2mm 6-pin Thin DFN (MT)

Top View Top View

Notes:
1. Thin DFN ▲ = Pin 1 identifier.

Pin Description
Pin Number
6-pin Pin
Pin Function
SOT-23-6L 2mmx2mm Name
Thin DFN
1 6 VIN Input: Power switch and logic supply input.
2 5 GND Ground: Input and output return pin.
Enable (Input): Logic compatible, enable control input that allows turn-on/-off of
3 4 EN
the switch. Do not leave the EN pin floating.
Fault Status Flag (Output): Active-low, open-drain output. A logic LOW state
indicates an over current or thermal shutdown condition. An over current condition
4 3 FAULT/
must last longer than tFAULT/ in order to assert FAULT/. A pull-up resistor (10kΩ
recommended) to an external supply is required.
Slew Rate Control: Adjustable soft-start input. Adding a small value capacitor from
5 2 CSLEW
CSLEW to VIN slows the turn-on time of the power MOSFET.
6 1 VOUT Switch Output: Power switch output.

Exposed Pad: Exposed pad on bottom side of package. Connect to electrical

— EP ePad
ground for optimum thermal dissipation.

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Absolute Maximum Ratings(1) Operating Ratings(3)

VIN to GND....................................................... 0.3V to +6V Supply Voltage (VIN)..................................... +2.5V to +5.5V
VOUT to GND ...................................................... 0.3V to VIN VEN, VFAULT/ ................................................... 0.3V to +5.5V
VCSLEW to GND................................................. 0.3V to +6V VCSLEW, VOUT ...................................................... 0.3V to VIN
VEN to GND...................................................... 0.3V to +6V Ambient Temperature Range (TA) .............. –40°C to +85°C
VFAULT/ to GND................................................. 0.3V to +6V Junction Temperature (TJ) ........................ –40°C to +125°C
FAULT/ Current (IFAULT/) ..............................................25mA Package Thermal Resistance
Maximum Power Dissipation (PD) .............Internally Limited SOT-23-6 (JA) ..............................................177.2°C/W
Lead Temperature (soldering, 10 sec.)...................... 260°C 6-pin 2mm  2mm DFN (JA) .............................90°C/W
Storage Temperature (TS).........................65°C to +150°C
ESD Rating(2)
HBM ......................................................................... 3kV
MM .........................................................................300V
Electrical Characteristics(4)
VIN = VEN = 5V; CIN = 1µF; CCSLEW = 0.1µF; COUT = 1µF; TJ = 25°C. Bold values indicate –40°C ≤ TJ ≤ +125°C, unless noted.
Symbol Parameter Condition Min. Typ. Max. Units
Power Supply Input
VIN Input Voltage Range 2.5 5.5 V

Input Supply Under-voltage VIN rising 2.0 2.25 2.5 V

VUVLO
Lockout Threshold VIN falling 1.9 2.15 2.4
Input Supply Under-voltage
VUVLOHYS VIN rising or VIN falling 100 mV
Lockout Threshold Hysteresis

Switch Active High Enable (A): VEN = 0V,

OFF VIN = 5V
0.75 5
(IOUT = 0A) Active Low Enable (B): VEN = VIN = 5V
IDD Supply Current µA
Active High Enable (A): VEN = 1.5V,
Switch ON VIN = 5V
100 300
(IOUT = 0A) Active Low Enable (B): VEN = 0V,
VIN = 5V
Power MOSFET
VIN = 2.5V, IOUT = 350mA 100 177
RDS(ON) Switch On-Resistance VIN = 3.3V, IOUT = 350mA 85 145 mΩ

VIN = 5V, IOUT = 350mA 75 125

ILKG Output Leakage Current Switch Off, VOUT = 0V 0.22 15 µA
Current Limit
MIC2033-05xxxx, VOUT = 0.8 x VIN 0.475 0.50 0.525
MIC2033-55xxx, VOUT = 0.8 x VIN(5) 0.517 0.550 0.578
ILIMIT Current Limit MIC2033-08xxxx, VOUT = 0.8 x VIN 0.76 0.80 0.84 A
MIC2033-10xxxx, VOUT = 0.8 x VIN 0.95 1.00 1.05
MIC2033-12xxxx, VOUT = 0.8 x VIN 1.14 1.20 1.26
I/O
Logic Low 0.5
V
VEN Enable Voltage Logic High 1.5

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IEN Enable Input Current 0V ≤ VEN ≤ 5V 1 µA

(4)
Electrical Characteristics (Continued)
Symbol Parameter Condition Min. Typ. Max. Units
RFAULT/ FAULT/ Output Resistance IOUT = 10mA 25 Ω
IFAULT/_OFF FAULT/ Off Current VFAULT/ = VIN 10 µA
ICSLEW CSLEW Input Current VCSLEW = VIN 0.6 µA
Thermal Protection
TSD Thermal Shutdown Threshold TJ Rising 157 °C
TSDHYS Thermal Shutdown Hysteresis 15 °C
Timing Specifications (AC Parameters)
tRISE Output Turn-on Rise Time(6) RLOAD = 10Ω; COUT = 1µF 700 µs
(6)
tFALL Output Turn-off Fall Time VEN = OFF; RLOAD = 10Ω; COUT = 1µF 32 µs
(6)
tON_DLY Output Turn-on Delay RLOAD = 10Ω; COUT = 1µF 700 µs
(6)
tOFF_DLY Output Turn-off Delay RLOAD = 10Ω; COUT = 1µF 5 µs
tSC_RESP Short Circuit Response
VOUT = 0V (short circuit) 10 µs
Time(6)
Over-current Fault Response
tFAULT/ (6) 16 32 49 ms
Delay Time
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. Devices are ESD sensitive. Handling precautions recommended. Human body model (HBM), 1.5kΩ in series with 100pF.
3. The device is not guaranteed to function outside its operating rating.
4. Specification for packaged product only.
5. Preliminary.
6. See Timing Diagrams (Figures 1-3).

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Timing Diagrams

EN

0
tFALL
tRISE

90% 90%

VOUT
10% 10%
0

Figure 1. Output Rise/Fall Time

EN 50% 50%

tON_DLY
tOFF_DLY
90%

VOUT
10%
0

Figure 2. Turn-On/Off Delay

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Figure 3. Short Circuit Response Time and Over Current Fault Flag Delay

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Typical Characteristics
Input Supply Current VIN OFF Current Undervoltage Lockout
vs. Temperature vs. Temperature vs. Temperature
200 1.50 2.50

SUPPLY OFF CURRENT (µA)

V IN = 5V VIN = 5V
175
IOUT = 0mA 1.25

UVLO THRESHOLD (V)

VEN = OFF
SUPPLY CURRENT (µA)

VIN Rising
150 2.25
IOUT = 0mA
1.00
125
VIN Falling
100 0.75 2.00

75
0.50
50 1.75

0.25
25

0 0.00 1.50
-50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125

TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C)

RDS(ON) RDS(ON) RDS(ON)

vs. Temperature vs. Temperature vs. Output Current
125 125 125
VIN = 5V
IOUT = 350mA V IN = 5V VIN = 5V
100 MIC2033-05xx 100 IOUT = 350mA 100 TA = 25°C
MIC2033-12xx MIC2033-05xx
RDS (ON) (mΩ)

RDS (ON) (mΩ)

RDS (ON) (mΩ)

75 75 75

50 50 50

25 25 25

0 0 0
-50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125 0 100 200 300 400 500
TEMPERATURE (°C) TEMPERATURE (°C) OUTPUT CURRENT (mA)

RDS(ON) RDS(ON) RDS(ON)

vs. Output Current vs. Output Current vs. Output Current
125 125 125
V IN = 3.3V VIN = 5V VIN = 3.3V
TA = 25°C TA = 25°C TA = 25°C
100 100 100
MIC2033-05xx MIC2033-12xx MIC2033-12xx
RDS (ON) (mΩ)
RDS (ON) (mΩ)

RDS (ON) (mΩ)

75 75 75

50 50 50

25 25 25

0 0 0
0 100 200 300 400 500 0.00 0.25 0.50 0.75 1.00 1.25 0.00 0.25 0.50 0.75 1.00 1.25
OUTPUT CURRENT (mA) OUTPUT CURRENT (A) OUTPUT CURRENT (A)

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Typical Characteristics (Continued)

Current Limit Current Limit Current Limit
vs. Temperature vs. Temperature vs. Temperature
600 1200 1.50
VIN = 5V

V IN = 5V VOUT = 4V
1000 1.25

CURRENT LIMIT (mA)

MIC2033-10xx
CURRENT LIMIT (mA)

CURRENT LIMIT (A)

V OUT = 4V
550
MIC2033-05xx
800 1.00

500 600 0.75

VIN = 5V
400 VOUT = 4V 0.50
MIC2033-08xx
450
200 0.25

400 0 0.00
-50 -25 0 25 50 75 100 125 -50 -20 10 40 70 100 130 -50 -20 10 40 70 100 130

TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C)

Current Limit VIN - VOUT VIN - VOUT

vs. Temperature vs. Output Current vs. Output Current
1.30 50 125
VIN = 5V
VIN = 5V
VIN = 5V TA = 25°C
40 TA = 25°C 100
VOUT = 4V MIC2033-12xx
CURRENT LIMIT (A)

1.25 MIC2033-05xx

VIN - VOUT (mV)

VIN - VOUT (mV)

MIC2033-12xx

30 75

1.20

20 50

1.15
10 25

1.10 0 0
-50 -25 0 25 50 75 100 125 0 100 200 300 400 500 0.00 0.25 0.50 0.75 1.00 1.25
TEMPERATURE (°C) OUTPUT CURRENT (mA) OUTPUT CURRENT (A)

FAULT/ Pin Resistance FAULT/ Response Time

vs. Temperature vs. Temperature
25 50
FAULT/ RESPONSE TIME (ms)
FAULT/ PIN RESISTANCE (Ω)

V IN = 5V
VIN = 5V
IFLAG = 10mA
20 40 MIC2033-xxxx

15 30

10 20

5 10

0 0
-50 -25 0 25 50 75 100 125 -50 -25 0 25 50 75 100 125
TEMPERATURE (°C) TEMPERATURE (°C)

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Functional Characteristics

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Functional Characteristics (Continued)

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Functional Diagram

Figure 4. MIC2033 Block Diagram

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Functional Description directly tied to VIN or driven by a voltage that is equal to

or less than VIN, but do not leave this pin floating.
The MIC2033 is a high-side MOSFET power distribution
switch providing increased system reliability utilizing 5% Current Limit
current limit accuracy. The MIC2033 has an operating The MIC2033 is available with four fixed current limit
input voltage range from 2.5V to 5.5V and is internally settings: 0.5A, 0.8A, 1A, and 1.2A. If the output current
current limited and has thermal shutdown that protects exceeds the set current limit, then the MIC2033 switch
the device and system. will enter constant current limit mode. The maximum
allowable current limit may be less than the full specified
Soft-Start
and/or expected current if the MIC2033 is not mounted
Soft-start reduces the power supply input surge current on a circuit board with sufficiently low thermal resistance.
at startup by controlling the output voltage rise time. The The MIC2033 responds within 10µs to short circuits to
input surge appears while the output capacitor is limit the output current and also provides an output fault
charged up. A slower output rise time will draw a lower flag that will assert (low) for an over current condition
input surge current. that lasts longer than 32ms.
During soft-start, an internal current sink discharges the
external capacitor at CSLEW to ground to control the Thermal Design
ramp of the output voltage. The output voltage rise time To help reduce the thermal resistance, the ePad
is dependent upon the value of CCSLEW, the input voltage, (underneath the IC) should be soldered to the PCB
output voltage, and the current limit. The value of the ground and the placement of thermal vias either
CSLEW external capacitor is recommended to be in the underneath or near the ePad is highly recommended.
range of 0.1µF to 1µF. Thermal design requires the following application-
Input Capacitor specific parameters:
A 1µF to 10µF ceramic input capacitor is recommended  Maximum ambient temperature (TA)
for most applications.  Output current (IOUT)
The input capacitor must be placed on the same side of  Input voltage (VIN)
the board and next to the MIC2033 to minimize the  Current Limit (ILIMIT)
voltage ringing during transient and short circuit
When the MIC2033 is in constant current limit mode, it
conditions. It is also recommended to use two vias for
may exceed the over temperature threshold. If this
each end of the capacitor to connect to the power and
occurs, the over temperature condition will shut down
ground plane.
the MIC2033 switch and the fault status flag will go
X7R or X5R dielectric ceramic capacitors are active (assert low). After the switch cools down, it will
recommended because of their temperature turn on again. The MIC2033 power dissipation can be
performance. X7R-type capacitors change capacitance maximized by either lowering the thermal resistance on
by 15% over their operating temperature range and are the exposed pad (only the DFN package has an
the most stable type of ceramic capacitors. Z5U and exposed pad) on the printed circuit board, or by limiting
Y5V dielectric capacitors change value by as much as the maximum allowable ambient temperature.
50% and 60% respectively over their operating
temperature ranges. To use a ceramic chip capacitor Thermal Measurements
with Y5V dielectric, the value must be much higher than It is always wise to measure the IC’s case temperature
an X7R ceramic or a tantalum capacitor to ensure the to make sure that it is within its operating limits. Although
same capacitance value over the operating temperature this might seem like a very elementary task, it is very
range. easy to get erroneous results. The most common
mistake is to use the standard thermal couple that
Output Capacitor comes with the thermal voltage meter. This thermal
The output capacitor type and placement criteria are the couple wire gauge is large, typically 22 gauge, and
same as the input capacitor. See the Input Capacitor behaves like a heatsink, resulting in a lower case
section for a detailed description. measurement.
Enable There are two suggested methods for measuring the IC
case temperature: a thermal couple or an infrared
The MIC2033 offers either an active high or active low thermometer. If a thermal couple is used, it must be
enable input (EN) that allows ON/OFF control of the constructed of 36 gauge wire or higher to minimize the
switch output. The current through the device reduces to wire heatsinking effect. In addition, the thermal couple tip
near “zero” when the device is shutdown, with only must be covered in either thermal grease or thermal glue
microamperes of leakage current. The EN input may be

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to make sure that the thermal couple junction is making thermometers’ spot size is too large for an accurate
good contact to the case of the IC. This thermal couple reading on small form factor ICs. However, an IR
from Omega (5SC-TT-K-36-36) is adequate for most thermometer from Optris has a 1mm spot size, which
applications. makes it ideal for the 3mm  3mm DFN package. Also,
To avoid this messy thermal couple grease or glue, an get the optional stand. The stand makes it easy to hold
infrared thermometer is recommended. Most infrared the beam on the IC for long periods of time.

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Evaluation Board Schematic

Bill of Materials
Item Part Number Manufacturer Description Qty.
C1608X5R0J105K TDK(1)
C1, C2 1µF/6.3V ceramic capacitor, X5R, 0603 2
06036D105KAT2A AVX(2)
06033C104KAT2A TDK
C3 0.1µF/25V ceramic capacitor, X7R, 0603 1
C1608X7R1E104K AVX
R1, R2 CRCW060310K0FKEA Vishay/Dale(3) 10kΩ, film resistor, 0603, 1% 2
(4)
U1 MIC2033-xxxYMT Micrel High-accuracy, high-side, fixed current limit power switch 1

Notes:
1. TDK: www.tdk.com.
2. AVX.: www.avx.com.
3. Vishay: www.vishay.com.
4. Micrel, Inc.: www.micrel.com

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PCB Layout (MIC2033-xxxYMT Evaluation Board)

MIC2033-xxxYMT Evaluation Board – Top Layer

MIC2033-xxxYMT Evaluation Board – Bottom Layer

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PCB Layout (MIC2033-xxxYM6 Evaluation Board)

MIC2033-xxxYM6 Evaluation Board – Top Layer

MIC2033-xxxYM6 Evaluation Board – Bottom Layer

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Package Information

6-Pin 2mm x 2mm Thin DFN (MT)

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Package Information (Continued)

SOT23-6L (M6)

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MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA

TEL +1 (408) 944-0800 FAX +1 (408) 474-1000 WEB http://www.micrel.com

Micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. This
information is not intended as a warranty and Micrel does not assume responsibility for its use. Micrel reserves the right to change circuitry,
specifications and descriptions at any time without notice. No license, whether express, implied, arising by estoppel or otherwise, to any intellectual
property rights is granted by this document. Except as provided in Micrel’s terms and conditions of sale for such products, Micrel assumes no liability
whatsoever, and Micrel disclaims any express or implied warranty relating to the sale and/or use of Micrel products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right

Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product
can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant
into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A
Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully
indemnify Micrel for any damages resulting from such use or sale.

© 2012 Micrel, Incorporated.

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