ADP8866 Charge Pump Driven 9-Channel LED Driver with Automated LED Lighting Effects

The ADP8866 combines a programmable backlight LED charge pump driver with automatic blinking functions. Nine LED drivers can be independently programmed at currents up to 25 mA. The current level, fade time, and blinking rate can be programmed once and executed autonomously on a loop. Separate fade in and out times can be set for the backlight LEDs.

Driving all of this 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. A full suite of safety features including short-circuit, overvoltage, and over-temperature protection 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.

Features and Benefits

Charge pump with automatic gain selection of 1x, 1.5x, and 2x for maximum efficiency.
92% peak efficiency
9 independent and programmable LED drivers
Each driver capable of 25 mA (full scale)
Each driver has 7 bits (128 levels) of non-linear current settings
Standby mode for <1 μA current consumption
16 programmable fade in and fade out times (0.0 sec to 1.75 sec) with choice of square or cubic rates
Automated and customizable LED blinking for all 9 channels.
Unique heartbeat mode for customizable double pulse lighting effects