LP39542 Datasheet, PDF (1/58 Pages) National Semiconductor (TI) – Advanced Lighting Management Unit

August 2007
LP39542
Advanced Lighting Management Unit
General Description
LP39542 is an advanced lighting management unit for hand-
held devices. It drives any phone lights including display
backlights, RGB, keypad and camera flash LEDs. The boost
DC-DC converter drives high current loads with high efficien-
cy. White LED backlight drivers are high efficiency low voltage
structures with excellent matching and automatic fade in/ fade
out function. The stand-alone command based RGB con-
troller is feature rich and easy to configure. Built-in audio
synchronization feature allows user to synchronize the color
LEDs to audio input. Integrated high current driver can drive
camera flash LED or motor/vibra. Internal ADC can be used
for ambient light or temperature sensing. The flexible I²C in-
terface allows easy control of LP39542. Small micro SMD
package together with minimum number of external compo-
nents is a best fit for handheld devices.
Features
■ ^{Audio synchronization for color/RGB LEDs}
■ ^{Command based PWM controlled RGB LED drivers}
■ ^{Programmable ON/OFF blinking sequences for RGB LED}
■ ^{High current driver for flash LED with built-in timing and}
safety feature.
■ ^{4+2 or 6 low voltage constant current white LED drivers}
with programmable 8-bit adjustment (0...25 mA/LED)
■ ^{High efficiency Boost DC-DC converter}
■ ^{I2C compatible interface}
■ ^{Possibility for external PWM dimming control}
■ ^{Possibility for clock synchronization for RGB timing}
■ ^{Ambient light and temperature sensing possibility}
■ ^{Small package – microSMD-36, 3.0 x 3.0 x 0.6 mm}
Applications
■ ^{Cellular Phones}
■ ^{PDAs, MP3 players}
Typical Applications
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