Charge Pump Based, Smart LED Driver Family with IC Interface

The ADP886X family combines a programmable backlight LED charge pump driver with automatic phototransistor control. This combination allows for significant power savings because it changes the current intensity in different ambient light conditions. By performing this function automatically, it eliminates the need for a processor to monitor the phototransistor. The light intensity thresholds are fully programmable via the I2C® interface.

All LEDs are programmable for minimum/ maximum current and fade in/out times via the I2C interface. These LEDs can also be combined into groups to reduce the processor instructions during fade in/out. Driving this entire configuration is a two-capacitor charge pump with gains of 1×, 1.5×, and 2×. This setup 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 shortcircuit, 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.

The ADP886X family is offered in two package types, either a compact WLCSP (wafer level chip scale package) or a small LFCSP (lead frame chip scale package).

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

* Built-in comparator inputs with programmable modes for ambient light sensing

* Programmable maximum current limit

* Programmable fade in and fade out times