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ADP8860 Dataheets PDF



Part Number ADP8860
Manufacturers Analog Devices
Logo Analog Devices
Description 7-Channel Smart LED Driver
Datasheet ADP8860 DatasheetADP8860 Datasheet (PDF)

Data Sheet Charge Pump, 7-Channel Smart LED Driver with I2C Interface ADP8860 FEATURES Charge pump with automatic gain selection of 1×, 1.5×, and 2× for maximum efficiency Up to two built-in comparator inputs with programmable modes for ambient light sensing Outdoor, office, and dark modes for maximum backlight power savings 7 independent and programmable LED drivers 6 drivers capable of 30 mA (typical) 1 driver capable of 60 mA (typical) Programmable maximum current limit (128 levels) Standby.

  ADP8860   ADP8860


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Data Sheet Charge Pump, 7-Channel Smart LED Driver with I2C Interface ADP8860 FEATURES Charge pump with automatic gain selection of 1×, 1.5×, and 2× for maximum efficiency Up to two built-in comparator inputs with programmable modes for ambient light sensing Outdoor, office, and dark modes for maximum backlight power savings 7 independent and programmable LED drivers 6 drivers capable of 30 mA (typical) 1 driver capable of 60 mA (typical) 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 Choose from linear, 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 Operation down to VIN = 2.5 V with undervoltage lockout (UVLO) at VIN = 2.0 V Small wafer level chip scale package (WLCSP) or lead frame chip scale package (LFCSP) APPLICATIONS Mobile display backlighting Mobile phone keypad backlighting Dual RGB backlighting LED indication General backlighting of small format displays GENERAL DESCRIPTION The ADP8860 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 office and dark 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. A second phototransistor input, with dedicated comparators, improves the ambient light detection levels for various user operating conditions. TYPICAL OPERATING CIRCUIT VOUT VALS OPTIONAL PHOTOSENSOR PHOTOSENSOR 0.1µF VIN 1µF D1 D2 D3 D4 D5 D7 CMP_IN D3 E3 E4 D4 C4 B4 B3 C3 A3 D6/ CMP_IN2 A2 VDDIO 0.1µF VOUT 1µF nRST E1 VDDIO SDA C2 VDDIO SCL E2 VDDIO ADP8860 C1+ A1 C1 C1– 1µF C1 C2+ B1 C2 B2 C2– 1µF 07967-001 nINT D2 A4 GND1 D1 GND2 Figure 1. The ADP8860 allows as many as six LEDs to be independently driven up to 30 mA (typical). A seventh LED can be driven to 60 mA (typical). 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 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. The ADP8860 is available in two package types, either a compact 2 mm × 2.4 mm × 0.6 mm WLCSP (wafer level chip scale package) or a small LFCSP (lead frame chip scale package). Rev. A Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2009–2018 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com ADP8860 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Typical Operating Circuit................................................................ 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 I2C Timing Diagram .................................................................... 4 Absolute Maximum Ratings............................................................ 5 Maximum Temperature Ranges ................................................. 5 Thermal Resistance ...................................................................... 5 ESD Caution.................................................................................. 5 Pin Configurations and.


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