LP5526 Datasheet, PDF (1/33 Pages) National Semiconductor (TI) – Lighting Management Unit with High Voltage Boost Converter with up to 150mA Serial FLASH LED Driver

March 2006
LP5526
Lighting Management Unit with High Voltage Boost
Converter with up to 150mA Serial FLASH LED Driver
General Description
LP5526 is a Lighting Management Unit for portable applica-
tions. It is used to drive display backlights, keypad LEDs,
RGB LEDs and camera flash LEDs. LP5526 can drive 2
separately connected strings of LEDs with high voltage
boost converter. The RGB driver allows driving either indi-
vidual color LEDs or RGB LED from separate supply power,
or it can be used to drive series connecter flash LEDs from
high voltage boost converter.
The backlight drivers (MAIN and SUB pins) are both high
resolution constant current mode drivers. The flash outputs
can drive series connected flash LED with up to 150mA of
current. External PWM control can be used for dimming any
selected LED outputs or it can be used to trigger the flash.
The flash has also 1-second safety timer.
The device is controlled through 2-wire low voltage I²C
compatible interface that reduces the number of required
connections.
Features
n High efficiency boost converter with programmable
output voltage up to 20V
n 2 individual drivers for serial display backlight LEDs
n Automatic dimming controller
n Stand alone RGB controller
n Dedicated flash function
n Safety function to avoid prolonged flash
n 3 general purpose IO pins
n 25-bump micro SMD Package: (2.54mm x 2.54mm x
0.6mm)
Applications
n Cellular Phones and PDAs
n MP3 Players
n Digital Cameras
Typical Application
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