LP3958

LP3958 www.ti.com SNVS423C – JANUARY 2006 – REVISED MARCH 2013 Lighting Management Unit with High Voltage Boost Converter Check for Samples: LP3958 FEATURES 1 2 High-Efficiency Boost Converter With Programmable Output Voltage Two Individual Drivers for Serial Display Backlight LEDs Three Drivers for Serial Keypad LEDs Automatic Dimming Controller Stand Alone Serial Leypad LEDs Controller Three General-Purpose IO Pins 25-Bump DSBGA Package: 2.54mm x 2.54mm x 0.6mm APPLICATIONS Cellular Phones and PDAs MP3 Players Digital Cameras 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 compatible interface that reduces the number of required connections. LP3958 is offered in a tiny 25-bump DSBGA package. Typical Application Li-Ion Battery or Charger CIN CVDD 10 PF 100 nF + CVDDA CVREF RKEY RRT 1 PF 100 nF VDDIO L1 10 PH VDD1 VDD2 VDDA VREF IKEY IRT MCU RSDA CVDDIO 100 nF SDA SCL NRST VDDIO D1 SW FB MAIN LP3958 SUB KEY1 KEY2 KEY3 G...