Three-Channel Charge Pump for White LED Applications

Manufacturer's part number :


Manufacturer Skyworks


Description :

The AAT3120 is a low noise, constant frequency charge pump DC/DC converter that uses fractional (1.5X) conversion to improve efficiency for white LED applications. The device can be used to produce eight current levels up to 20mA per channel for up to three channels. 1X load switch mode is also built-in to improve efficiency at low current settings. Low external parts count (two 1μF flying capacitors and two small 1μF capacitors at VIN and OUT) makes the AAT3120 ideally suited for small battery- powered applications. Skyworks' S2Cwire™ (Simple Serial Control™) serial digital input is used to enable, disable, and set current for each LED at eight different levels. The AAT3120 has a thermal management system to protect the device in the event of a short-circuit condition at the output pin. Built-in soft-start circuitry prevents excessive inrush current during start-up. A high charge pump switching frequency enables the use of very small external capacitors. A low current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1μA. The AAT3120 is available in the very small Pb-free 12-pin TSOPJW package.

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    • VIN Range: 2.7V to 5.5V
    • Fractional Charge Pump Mode
    • Drives Low-VF and High-VF Type LEDs
    • Up to Three LED Outputs
    • Single Wire Programming
    • Eight Regulated Current Settings
    • Max 20mA per Channel
    • Low Noise Constant Frequency Operation
    • No Inductors
    • 1MHz Switching Frequency
    • Small Application Circuit
    • Automatic Soft-Start
    • IQ <1μA in Shutdown
    • 12-Pin TSOPJW Package

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Features Similar products
Typ. Active O/P Current (mA) 20  

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Output Voltage (V) 4.3  
Typ. Quiescent Current (µA) < 1  
Input Voltage Range (V) 2.7 to 5.5  
Device Type Regulated  
Operating Temperature (°C) -40 to +85  
Package TSOPJW-12