CP2122 Datasheet PDF - CHIP

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CP2122
CHIP

Part Number CP2122
Description Step-Up White-LED Driver
Page 2 Pages


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Product Brief
CP2122
V1.0
LED Driver Series
Step-Up White-LED Driver for Mid-size or Large Panel
www.datasheet4Gu.econmeral Description
The CP2122 is a step-up DC/DC converter specifically designed for
driving white LEDs with a constant current. Operation at a fixed
switching frequency of 1.4MHz allows the device to be used with small
value external ceramic capacitors and inductors. Series connection of
LEDs provides equal LED current which results in uniform brightness.
300mV feedback voltage minimizes the power loss in the current setting
resistor for better efficiency. The CP2122 high-voltage output stage is
ideal for driving parallel strings of up to seven white LEDs in series or up
to 34V. The CP2122 features an internal soft start to eliminate inrush
current during startup. Equipped with built-in over-voltage protection
function, the device enters a very low power operating mode during the
“OPEN LED” fault conditions. The CP2122 is available in SOT23-5L
package.
Features
y Switch current limit 700mA
y Drives LED strings up to 34V
y Up to 84% efficiency
y Soft start “in-rush” current limiting
y Fast 1.4 MHz switching frequency
y Built-in over-voltage protection
y Shutdown current: <1μA
y Low profile SOT23-5L package
Applications
y Portable navigation devices
y Digital photo frames
y Portable media players
y Personal digital assistants
y Portable game machines
Pin Configurations
SOT23-5L
-40~85
CP2122 Top View
SOT23-5L
Copyright ©2008 Chiphomer Technology Limited
1

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