LP3958 Datasheet, PDF (1/28 Pages) National Semiconductor (TI) – Lighting Management Unit with High Voltage Boost Converter

February 2006
LP3958
Lighting Management Unit with High Voltage Boost
Converter
General Description
LP3958 is a Lighting Management Unit for portable applica-
tions. It is used to drive display backlight and keypad LEDs.
The device can drive 5 separately connected strings of LEDs
with high voltage boost converter.
The keypad LED driver allows driving LEDs from high volt-
age boost converter or separate supply voltage.The MAIN
and SUB outputs are high resolution current mode drivers.
Keypad LED outputs can be used in switch mode and cur-
rent mode. External PWM control can be used for any se-
lected outputs.
The device is controlled through 2-wire low voltage I²C
compatible interface that reduces the number of required
connections.
LP3958 is offered in a tiny 25-bump micro-SMD package.
Features
n High efficiency boost converter with programmable
output voltage
n 2 individual drivers for serial display backlight LEDs
n 3 drivers for serial keypad LEDs
n Automatic dimming controller
n Stand alone serial keypad LEDs controller
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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