High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

Manufacturer's part number :


Manufacturer Skyworks


Description :

The AAT3156 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 for white LED applications. The AAT3156 is capable of driving six LED channels at a total of 180mA from a 2.7V to 5.5V input. The current sinks may be operated individually or in parallel for driving higher-current LEDs. A low external parts count (two 1μF flying capacitors and two small 1μF capacitors at VIN and VOUT) make this part ideally suited for small, battery-powered applications. Skyworks' AS2Cwire™ (Advanced Simple Serial Control) serial digital input is used to enable, disable, and set current for each LED with a 16-level logarithmic scale plus four low-current settings down to 50μA for optimized efficiency, with a low housekeeping current of only 50μA. Each output of the AAT3156 is equipped with built-in protection for VOUT short circuit and auto-disable for LED failure conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up. A low-current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1μA. The AAT3156 is available in a Pb-free, space-saving, thermally-enhanced 16-pin 4x4mm QFN package.

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    • VIN Range: 2.7V to 5.5V
    • Fully Programmable Current with Single Wire
    • 16-Step Logarithmic Scale
    • 15/20/30mA Max Current
    • Four Low Current Settings Down to 50μA
    • Low IQ (50μA) for Low Current Mode
    • Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and VF Coverage
    • Drives Six Channels of LEDs
    • Individual Main/Sub-Group Control
    • No Inductors, Low Noise Operation
    • 1MHz Constant Switching Frequency
    • Small Application Circuit
    • Built-In Thermal Protection
    • Built-In Auto-Disable For Open Circuit
    • Automatic Soft Start
    • IQ <1μA in Shutdown
    • Thermally-Enhanced QFN44-16 Package

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Features Similar products
Typ. Active O/P Current (mA) 30  

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Output Voltage (V) 4.3  
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 QFN44-16