LP3958 Datasheet | National Semiconductor

Description LP3958 is a Lighting Management Unit for portable applications. 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 voltage 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 current mode. External PWM control can be used for any selected outputs. The device is controlled through 2-wire low voltage I2C patible 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 © 2006 National Semiconductor Corporation DS201755 .national. Connection Diagrams and Package Mark Information CONNECTION DIAGRAMS 25-Bump Thin Micro SMD Package, Large Bump NS Package Number TLA25CCA .. Top View Bottom View PACKAGE MARK ORDERING INFORMATION Order Number LP3958TL LP3958TLX Package Marking SJHB SJHB Supplied As TNR 250 TNR 3000 Spec/Flow No Pb No Pb .national. Connection Diagrams and Package Mark Information PIN DESCRIPTIONS Pin # 5E 5D 5C 5B 5A 4E 4D 4C 4B 4A 3E 3D 3C 3B 3A 2E 2D 2C 2B 2A 1E 1D 1C 1B 1A Name SW FB KEY1 KEY2 KEY3 GND_SW NRST SCL IKEY GND_KEY VDD2 VDDIO SDA GPIO[2] GPIO[0] / PWM GND_WLED GNDT VDD1 VREF GPIO[1] MAIN SUB VDDA GND IRT Type Output Input Output Output Output Ground Input Logic Input Input Ground Power Power Logic Input/Output Logic Input/Output Logic...