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CAT4139
22 V High Current Boost
White LED Driver
Description
The CAT4139 is a DC/DC step ? up converter that delivers an
accurate constant current ideal for driving LEDs. Operation at a fixed
switching frequency of 1 MHz allows the device to be used with small
value external ceramic capacitors and inductor. LEDs connected in
series are driven with a regulated current set by the external resistor
R1. The CAT4139 is ideal for driving parallel strings of up to five
white LEDs in series or up to 22 V.
LED dimming can be done by using a DC voltage, a logic signal, or
a pulse width modulation (PWM) signal. The shutdown input pin
allows the device to be placed in power ? down mode with “zero”
quiescent current.
In addition to thermal protection and overload current limiting, the
device also enters a very low power operating mode during “Open
LED” fault conditions. The device is housed in a low profile (1 mm
max height) 5 ? lead TSOT ? 23 package for space critical applications.
http://onsemi.com
5
1
TSOT ? 23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
SW VIN
GND
Features
FB
SHDN
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Switch Current Limit 750 mA
Drives LED Strings up to 22 V
Up to 87% Efficiency
Low Quiescent Ground Current 0.6 mA
1 MHz Fixed Frequency Low Noise Operation
Soft Start “In ? rush” Current Limiting
Shutdown Current Less than 1 m A
Open LED Overvoltage Protection
Automatic Shutdown at 1.9 V (UVLO)
Thermal Overload Protection
TSOT ? 23 5 ? Lead (1 mm Max Height)
These Devices are Pb ? Free, Halogen Free/BFR Free and are RoHS
Compliant
(Top View)
MARKING DIAGRAM
TPYM
TP = Specific Device Code
Y = Production Year (Last Digit)
M = Production Month (1 ? 9, A, B, C)
ORDERING INFORMATION
Device Package Shipping
Applications
? GPS Navigation Systems
? Portable Media Players
? Handheld Devices
CAT4139TD ? GT3 TSOT ? 23 3,000/
(Note 1) (Pb ? Free) Tape & Reel
1. NiPdAu Plated Finish (RoHS ? compliant)
? Semiconductor Components Industries, LLC, 2010
February, 2010 ? Rev. 1
1
Publication Order Number:
CAT4139/D
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