ADP8870

PRODUCTION

Charge Pump Parallel Backlight Driver with Image Content PWM Input

Data Sheet (Rev. C) Product Selection Table

Part Models: 2
1ku List Price: Starting From $1.27

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Overview

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)

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 combination allows significant power savings because it automatically changes the current intensity based on the sensed ambient lighting levels and the display image content. It performs this function automatically, eliminating the need for a processor to monitor the phototransistor. The light intensity thresholds are fully programmable via the I²C interface.

The ADP8870 allows up to six LEDs to be independently driven up to 30 mA (maximum). An additional seventh LED can be driven to 60 mA (maximum). All LEDs are individually programmable for minimum/maximum current and fade-in/fade-out times through an I²C interface. These LEDs can also be combined into groups to reduce the processor instructions during fade-in and fade-out.

Driving these components 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 overtemperature protection, allows 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

Mobile display backlighting
Mobile phone keypad backlighting
RGB LED lighting
LED indication
General backlighting of small format displays

Part Models: 2
1ku List Price: Starting From $1.27

Documentation

Data Sheet 1

ADP8870: Charge-Pump, Parallel Backlight Driver with Image Content PWM Input Data Sheet (Rev.C) 08/12/2010

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
ADP8870ACBZ-R7	20-Ball WLCSP (2.15mm x 2.35mm x 0.6mm)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
ADP8870ACPZ-R7	20-Lead LFCSP (4mm x 4mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 28, 2012 - 11_0175 Shipping Changes for WLCSP Products with 8mm Carrier Tape Width
		PCN11_0175_Form Material_Report Qualification Report Summary Detailed Parts List
ADP8870ACBZ-R7	PRODUCTION
Feb 6, 2017 - 16_0234 Assembly Transfer to ASE Korea and Test Transfer to STATS ChipPAC Singapore of Select LFCSP Parts.
		PCN16_0234_Form Material_Report Detailed Change Description Detailed Change Description Qualification Results Summary Test Correlation Report
ADP8870ACPZ-R7	PRODUCTION
Aug 6, 2014 - 13_0230 Assembly and Test Transfer of Select 3.5x3.5, 4x3, 4x4, and 5x5mm LFCSP Products to STATS ChipPAC China
		PCN13_0230_Form Material_Report Detailed Change Description Qualification Results Summary Test Correlation Report
ADP8870ACPZ-R7	PRODUCTION