LED Backlight Driver and Multiple LDO Lighting Management Unit

Manufacturer's part number :


Manufacturer Skyworks


Description :

The AAT2870 is a highly integrated charge pump-based lighting management unit (LMU) providing eight independently configurable LED channels that can also be grouped into main or sub backlight controls. The built-in support for low cost ambient light sensors automates all brightness adjustments. In addition, four programmable low dropout (LDO) linear regulators are provided to supply other lighting and camera module functions. The LMU is optimized for single-cell lithium-ion/polymer systems making it ideal for portable devices. A tri-mode negative charge pump provides power to backlight LEDs with improved efficiency over conventional charge pump topologies. All eight backlight LED current sinks are programmable up to 27.9mA. LEDs may be set individually or in groups for various arrays of backlight or keypad lighting applications. High frequency PWM dimming for both Main and Sub display backlighting is provided and is compliant to Content Adaptive Brightness Control (CABC) specifications with a PWM frequency up to 100 kHz. The ambient light control features automatic sensor calibration and 50Hz/60Hz noise rejection for accurate brightness adjustment without processor intervention. All AAT2870 functions are programmed using an industry standard bi-directional I2C interface. This interface can enable, disable, and set the backlight current to one of 32 levels (5 bits) for the backlight. Backlight current matching is better than ±3% for uniform display/sub display brightness. The AAT2870 also contains four high-performance low noise, low dropout (LDO) linear regulators. Each regulator starts up with a default 1.2V and is adjustable by programming through the I2C interface. LDOA can supply up to 300mA, while LDOB, C and D can source up to 150mA to a system load. The AAT2870 is available in a Pb-free, space-saving 3.1mm x 2.6mm, 30 ball CSP package rated over the -40°C to +85°C temperature range.

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    • Charge Pump Input Voltage Range: 2.7V to 5.5V
    • Tri-Mode Negative Charge Pump
    • Improved Efficiency
    • Drives up to Eight LEDs
    • 1.3MHz Switching Frequency
    • Automatic Soft Start
    • Industry Standard I2C Programming Interface
    • Programmable Backlight Current (8 Channels)
    • 27.9mA Maximum Current per Channel
    • 32 Levels (5 bits): 0.45mA 27.9mA
    • Independent Main or Sub Settings
    • Programmable Fade-On / Off
    • Advanced Dimming Features
    • Ambient Light Sensor Management
    • Direct Ambient Dimming Function
    • 128 Programmable Levels
    • PWM Dimming (CABC Compatible)
    • Four Linear Regulators
    • LDOA up to 300mA
    • LDOB, C and D up to 150mA
    • 150mV Dropout
    • I2C Programmable Outputs: 1.2V to 3.3V
    • Output Auto-Discharge for Fast Shutdown

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Features Similar products
Typ. Active O/P Current (mA) 27.9  

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Output Voltage (V) 3.3  
Typ. Quiescent Current (µA) < 1  
Input Voltage Range (V) 2.7 to 5.5  
Device Type Regulated  
Operating Temperature (°C) -40 to +85  
Package WLCSP-30