W-6237 Datasheet, PDF (1/13 Pages) Copal Electronics – High Voltage CMOS Boost

W-6237
High Voltage CMOS Boost
White LED Driver
Description
The W-6237 is a DC/DC VWHSïXS converter that delivers an
DFFXUDWe constant FXUUHQW ideal for driving LEDs. Operation at a
constant switching IUHTXHQF\ of 1 MHz allows the device to be XVHG
with small YDOXH external ceramic capacitors and LQGXFWRr. LEDs
connected in series are driven with a UHJXODWHG FXUUHQW set E\ the
external resistor R₁. LEDFXUUHQWsXSWRPA can be sXSSRUWHGRYHr
a wLGHUDQJHRILQSXWsXSSO\YROWDJHs from 2.8 V to 5.5 V, making the
device ideal for batter\ïpowered applications. The W-6237
highïvoltage RXWSXW stage is perfect for driving six, seven or eight
white /('VLQVHULHVZLWKLQKHUHQWFXUUHQWPDWFKLQJLQ/&'EDFNOLJKt
applications.
LEDGLPPLQJFDQEHGRQHE\XVLQJD'&YROWDJHDORJLFVLJQDORr
a SXOVH width PRGXODWLRQ (PWM) signal. The VKXWGRZQ LQSXW pin
allows the device to be placed in powerïdown mode with “zero”
TXLHVFHQtFXUUHQW
In addition to thermal protection and overload FXUUHQW limiting, the
device also enters a YHU\ low power operating mode GXULQJ “Open
LED” IDXOW conditions. The device is KRXVHG in a low profile (1 mm
max height) 5ïlead thin SOT23 package for space critical
applications.
Features
v Drives 6 to 8 White LEDs in Series from 3 V
v Up to 87% EfILFLHQF\
v LoZ4Xiescent GroXQd CXUUent.6 mA
v $GMXVWDEOH2XWSXW&XUUHQWXSWRP$
v High FreTXenc\0+z Operation
v High Voltage Power Switch
v ShXtdown &Xrrent Less than 1 A
v Open LED Low Power Mode
v $XWRPDWLF6KXWGRZQDW989/2
v 7KHUPDO6KXWGRZQ3URWHFWLRQ
v Thin SOT23 5ïlead (1 mm Max Height)
v These Devices are PbïFree, Halogen Free/BFR Free and are RoHS
Compliant
Applications
v Color LCD and Ke\Sad Backlighting
v CellXlar Phones
v Handheld Devices
v Digital Cameras
v PDAs
v Portable Game Machine
5
1
TSOTï23
PIN CONNECTIONS
1
SW
VIN
*1'
FB
SHDN
(Top View)
MARKING DIAGRAMS
UDYM
8' :7'ï*7
Y = Production Year (Last Digit)
M = Production Month (1ï9, A, B, C or O, N, D)
ORDERING INFORMATION
Device
:7'ï*7
(Note 1)
Package
TSOTï23
(PbïFree)
Shipping
3,000/
Tape & Reel
1. ^{NiPdAu Plated Finish (RoHSïcompliant)}
¢NIDEC COPAL ELECTRONICS CORP.
1
'HFHPEHU,201ïRev. 
Publication Order Number:
W-6237/(