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ON Semiconductor - High Voltage CMOS Boost White LED Driver

Numéro de référence CAT4237
Description High Voltage CMOS Boost White LED Driver
Fabricant ON Semiconductor 
Logo ON Semiconductor 





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CAT4237 fiche technique
CAT4237
High Voltage CMOS Boost
White LED Driver
Description
The CAT4237 is a DC/DC stepup 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 R1. 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 batterypowered applications. The CAT4237
highvoltage 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 powerdown 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) 5lead thin SOT23 package for space critical
applications.
Features
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 mA
Open LED Low Power Mode
Automatic Shutdown at 1.9 V (UVLO)
Thermal Shutdown Protection
Thin SOT23 5lead (1 mm Max Height)
These Devices are PbFree, Halogen Free/BFR Free and are RoHS
Compliant
Applications
Color LCD and Keypad Backlighting
Cellular Phones
Handheld Devices
Digital Cameras
PDAs
Portable Game Machine
http://onsemi.com
5
1
TSOT23
TD SUFFIX
CASE 419AE
PIN CONNECTIONS
1
SW VIN
GND
FB SHDN
(Top View)
MARKING DIAGRAMS
LTYM
UDYM
LT = CAT4237TDT3
UD = CAT4237TDGT3
Y = Production Year (Last Digit)
M = Production Month (19, A, B, C)
ORDERING INFORMATION (Note 3)
Device
CAT4237TDT3
(Note 1)
Package Shipping (Note 4)
TSOT23
(PbFree)
3,000/
Tape & Reel
CAT4237TDGT3 TSOT23
(Note 2)
(PbFree)
3,000/
Tape & Reel
1. MatteTin Plated Finish (RoHScompliant).
2. NiPdAu Plated Finish (RoHScompliant)
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

PagesPages 12
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