CP2126 Datasheet PDF - CHIP

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CP2126
CHIP

Part Number CP2126
Description White LED Step-up Converter
Page 2 Pages


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Step-Up White-LED Driver
Product Brief
CP2126
DC/DC Series
CP2126_PB_ ENG _Rev1.0 March,2004
www.daOtasVheEet4Ru.cVomIEW
The CP2126 is a step-up DC/DC converter specifically designed to drive white
LEDs with a constant current. The device can drive two, three or four white LEDs
in series from a Li-Ion cell. Series connection of LEDs provides identical LED
currents resulting in uniform brightness. The CP2126 switches at 900KHz
allowing the use of tiny components. The external capacitor can be as small as
0.22uF, saving space and cost versus alternative solutions. A low 95mV feedback
voltage minimizes power loss in the current setting resistor for better efficiency.
SOT23-5L
-40℃~85
FEATURES
Inherently matched LED current
High efficiency: 85% typical
Drives up to four LEDs from a 3.2V supply
20V stable bipolar switch
Fast 900KHz switching frequency
Uses tiny 1mm tall inductors
Requires only 0.22uF output capacitor
Operating Industrial temperature range: -40~ 85
SOT23-5L package
VIN
5
VREF
1.25V
CS
3
-
95mV A1
+
SHDN
4
Power Down
-
A2
+
RC
CC
+
Ramp
Generator
900KHz
Oscillator
LX
1
RQ
S
+
A3
-
Q1
0.2 Ohm
2 GND
Copyright ©2004 Chiphomer Technology Limited
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