High Efficiency Six Outputs 1.5X Fractional Charge Pumps for White LED

Manufacturer's part number :

AAT3114ISN-20-T1

Manufacturer Skyworks

Skyworks

Description :

The AAT3113 and AAT3114/14A are low noise, constant frequency charge pump DC/DC converters that use fractional (1.5X) conversion to increase efficiency in white LED applications. The devices can be used to produce current levels up to 20mA for each output from a 2.7V to 5.5V input. A low external parts count (two 1μF flying capacitors and two small bypass capacitors at VIN and OUT) makes these devices ideally suited for small, battery- powered applications. Skyworks' Simple Serial Control™ (S2Cwire™) interface is used to enable, disable, and set the LED drive current for 32-level logarithmic scale LED brightness control. AAT3113 and AAT3114/14A devices have a thermal management system for protection in the event of a short-circuit condition on any of the output pins. Built-in soft-start circuitry prevents excessive inrush current during start-up. A high switching frequency enables the use of small external capacitors. A low-current shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1μA. The AAT3113 provides four LED current source outputs, and the AAT3114/14A provides six. The AAT3113 is available in a Pb-free 12-pin TSOPJW package, and the AAT3114/14A is available in a Pb-free 16-pin QFN package.

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    Features

    • Six Outputs
    • 20mA Full-Scale Current
    • Simple Serial Control (S2Cwire) Interface
    • 32-Position Logarithmic Scale with Digital Control
    • Low Noise Constant Frequency Operation
    • 33% Less Input Current Than Doubler Charge Pump
    • High Accuracy Brightness Matching
    • Small Application Circuit
    • Regulated Output Current
    • Automatic Soft Start
    • VIN Range: 2.7V to 5.5V
    • No Inductors
    • 600kHz Switching Frequency
    • IQ <1μA in Shutdown
    • Temperature Range: -40°C to 85°C
    • 16-Pin QFN Package

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

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Output Voltage (V) 4.2  
Typ. Quiescent Current (µA) < 1  
Input Voltage Range (V) 2.7 to 5.5  
Device Type Regulated  
Operating Temperature (°C) -40 to +85  
Package QFN44-16