Charge Pump, 7-Channel Fun Lighting LED Driver

The ADP8863 combines a powerful charge pump driver with advanced autonomous LED lighting features. It allows as many as seven LEDs to be independently driven up to 30 mA (maximum). The seventh LED can also be driven to 60 mA (maximum). All LEDs are programmable for maximum current and fade in/fade out times via the I2C interface.

Additionally, automated blinking routines can be independently programmed and enabled for all seven LED channels. These LEDs can also be combined into groups to reduce the processor instructions.

This entire configuration is driven by a two-capacitor charge pump with gains of 1×, 1.5×, and 2×. The charge pump is capable of driving a maximum IOUT of 240 mA from a supply of 2.5 V to 5.5 V. The device includes a variety of safety features including short-circuit, overvoltage, and overtemperature protection.

These features allow easy implementation of a safe and robust design. Additionally, input inrush currents are limited via an integrated soft start combined with controlled input-to-output isolation.

APPLICATIONS

* LED indication

* Funlight indicator lighting

* Keypad backlighting

* RGB LED color generation and mixing

* General backlighting of small format displays

* Automated blinking and funlight timing for each LED driver

* 16 programmable fade in and fade out times

* 0.1 sec to 5.5 sec

* Selectable linear, square, or cubic fade rates

* 7 independent and programmable LED drivers

* 7 drivers capable of 30 mA (maximum)

* 1 driver also capable of 60 mA (maximum)

* Programmable maximum current limit (128 levels)

* Separate and independent controls for backlight LEDs

* Backlight fade override

* Up to two built-in comparator inputs with programmable modes for ambient light sensing

* Charge pump with automatic gain selection of 1×, 1.5×, and 2× for maximum efficiency