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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Step-Up White-LED Driver
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Cellular phones
Digital Cameras
MP3 Players
PDAsHandheld computers
GPS Receivers
TYPICAL APPLICATION
VIN
Product Brief
L1
22uH
D1
VIN LX
C1
1uF CP2126
OFF ON
SHDN
GND
CS
CP2126
DC/DC Series
CP2126_PB_ ENG _Rev1.0 March,2004
Vout
LED1
LED2
LED3
R1
C2
0.22uF
RELATED PRODUCTS
CP2127:
CP2128:
Step up White LED Driver, Switches at 1200kHz, can drive two to four LEDs in series.
Regulated Charge Pump DC/DC Converter with low noise, constant frequency.
Chiphomer Technology Limited
Add: 4F, Building D, 1618 Yishan Road, Shanghai, P.R.C.
Tel: +86-(0)21-64058488, 64014543
Fax: +86-(0)21-64050030
Email: sales@chiphomer.com
Web: www.chiphomer.com
Copyright ©2004 Chiphomer Technology Limited
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