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ADP8870

Analog Devices
Part Number ADP8870
Manufacturer Analog Devices
Description Parallel Backlight Driver
Published Oct 20, 2010
Detailed Description Data Sheet Charge-Pump, Parallel Backlight Driver with Image Content PWM Input ADP8870 FEATURES Charge pump with autom...
Datasheet PDF File ADP8870 PDF File

ADP8870
ADP8870

Overview
Data Sheet Charge-Pump, Parallel Backlight Driver with Image Content PWM Input ADP8870 FEATURES Charge pump with automatic gain selection of 1×, 1.
5×, and 2× for maximum efficiency Two high accuracy (±5%) phototransistor inputs for automated ambient light sensing (ALS) 5 programmable ambient light-sensing zones for optimal backlight power savings Independent ALS control of D7, for automated response of keypad lighting to ambient light levels PWM input can be used for content adaptive brightness control (CABC) of any, or all, of the LEDs PWM input scales the LED output current 7 independent, programmable LED drivers 6 drivers capable of 30 mA (maximum) 1 driver capable of 60 mA (maximum) Programmable maximum current limit (128 levels) Standby mode for <1 μA current consumption 16 programmable fade-in and fade-out times (0.
1 sec to 5.
5 sec) with choice of square or cubic rates Fading override I2C-compatible interface for all programming Dedicated reset pin and built-in power-on reset (POR) Short-circuit, overvoltage, and overtemperature protection Internal soft start to limit inrush currents Input-to-output isolation during faults or shutdown Operates down to VIN = 2.
5 V, with undervoltage lockout (UVLO) at 2.
0 V.
Available in a small, 2.
15 mm × 2.
36 mm × 0.
6 mm wafer level chip scale package (WLCSP) or a 4 mm × 4 mm × 0.
75 mm lead frame chip scale package (LFCSP) APPLICATIONS Mobile display backlighting Mobile phone keypad backlighting RGB LED lighting LED indication General backlighting of small format displays TYPICAL OPERATING CIRCUIT VOUT VDD_ALS OPTIONAL PHOTOSENSOR PHOTOSENSOR 0.
1µF D1 D2 D3 D4 D5 D6 D7 CMP_IN 0.
1µF VIN 1µF VDDIO VOUT 1µF nRST SDA SCL nINT PWM ADP8870 C1+ C1 C1– 1µF C2+ C2 C2– 1µF GND Figure 1.
08829-001 GENERAL DESCRIPTION The ADP8870 combines a programmable backlight LED charge-pump driver with automatic phototransistor control of the brightness (LED current) and a PWM input to control the scale of the output current.
This c...


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