Four-Channel Backlight Driver Tri-Mode Charge Pump with Dual LDOs

Manufacturer's part number :


Manufacturer Skyworks


Description :

The AAT2845 is a highly integrated power solution for single-cell lithium ion-based LCD display applications. It includes a four-channel LED backlight driver and two integrated 200mA LDOs as additional power supplies for display and camera-related chipsets. The backlight driver is a low noise, constant frequency charge pump DC/DC converter that uses a tri-mode load switch (1X), fractional (1.5X), and doubling (2X) conversion to maximize efficiency. Each of the four channels is capable of driving up to 20mA per channel. Skyworks' S2Cwire™ (Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED with 16 available settings down to 50μA. The low current mode supply current can be as low as 50μA to save power and maintain high efficiency. Each LED output is equipped with built-in protection for short-circuit and auto-disable functions. Built-in softstart circuitry prevents excessive inrush current during start-up. A low current shutdown feature disconnects the load from the input and reduces quiescent current to less than 1μA. The AAT2845 is available in a Pb-free, thermally enhanced 20-pin 3x4mm TQFN package.

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    • Input Voltage Range: 2.7V to 5.5V
    • Four-Channel LED Driver
    • Tri-Mode Charge Pump
    • Up to 20mA/Channel
    • Easy Control with Single Wire Interface
    • 16 Current Levels
    • Four Low Current Settings Down to 50μA
    • Low IQ (50μA) for Low Current Mode
    • >90% Peak Efficiency
    • Dual, 200mA LDOs
    • User-Programmable Outputs: AAT2845-EE
    • Fixed Output Voltages
    • AAT2845-QG: 2.8V and 1.5V
    • AAT2845-QI: 2.8V and 1.8V
    • Automatic Soft-Start
    • Over-Temperature Protection
    • Available in 3x4mm TQFN34-20 Package
    • -40°C to +85°C Temperature Range

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Features Similar products
Typ. Active O/P Current (mA) 200  

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Output Voltage (V) 2.8  
Typ. Quiescent Current (µA) 50  
Input Voltage Range (V) 2.7 to 5.5  
Device Type Tri-mode Load Switch / Fractional and Doubling  
Operating Temperature (°C) -40 to +85  
Package TQFN34-20