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CAT4237
High Voltage CMOS Boost
White LED Driver
Description
The CAT4237 is a DC/DC step ? up converter that delivers an
accurate constant current ideal for driving LEDs. Operation at a
constant 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 R 1 . LED currents up to 40 mA can be supported over
a wide range of input supply voltages from 2.8 V to 5.5 V, making the
device ideal for battery ? powered applications. The CAT4237
high ? voltage output stage is perfect for driving six, seven or eight
white LEDs in series with inherent current matching in LCD backlight
applications.
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.
http://onsemi.com
5
1
TSOT ? 23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
SW VIN
GND
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
FB
(Top View)
SHDN
max height) 5 ? lead thin SOT23 package for space critical
applications.
Features
MARKING DIAGRAMS
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Drives 6 to 8 White LEDs in Series from 3 V
Up to 87% Efficiency
Low Quiescent Ground Current 0.6 mA
Adjustable Output Current (up to 40 mA)
High Frequency 1 MHz Operation
High Voltage Power Switch
Shutdown Current Less than 1 m A
Open LED Low Power Mode
Automatic Shutdown at 1.9 V (UVLO)
Thermal Shutdown Protection
Thin SOT23 5 ? lead (1 mm Max Height)
These Devices are Pb ? Free, Halogen Free/BFR Free and are RoHS
Compliant
LTYM UDYM
LT = CAT4237TD ? T3
UD = CAT4237TD ? GT3
Y = Production Year (Last Digit)
M = Production Month (1 ? 9, A, B, C)
ORDERING INFORMATION (Note 3)
Device Package Shipping (Note 4)
CAT4237TD ? T3 TSOT ? 23 3,000/
(Note 1) (Pb ? Free) Tape & Reel
CAT4237TD ? GT3 TSOT ? 23 3,000/
(Note 2) (Pb ? Free) Tape & Reel
Applications
? Color LCD and Keypad Backlighting
? Cellular Phones
? Handheld Devices
? Digital Cameras
? PDAs
? Portable Game Machine
1. Matte ? Tin Plated Finish (RoHS ? compliant).
2. NiPdAu Plated Finish (RoHS ? compliant)
3. For detailed information and a breakdown of
device nomenclature and numbering systems,
please see the ON Semiconductor Device No-
menclature document, TND310/D, available at
www.onsemi.com
4. For information on tape and reel specifications, in-
cluding part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifica-
tions Brochure, BRD8011/D.
? Semiconductor Components Industries, LLC, 2011
November, 2011 ? Rev. 3
1
Publication Order Number:
CAT4237/D
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