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

Manufacturer's part number :

AAT3152IWP-T1

Manufacturer Skyworks

Skyworks

Description :

The AAT3152 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 AAT3152 is capable of driving four-channel LEDs 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) makes this part 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 with eight settings (20mA down to 50μA) including main/sub-display group control. The AAT3152 consumes extremely low current internally (50μA typical) at light load for optimized efficiency. Each output of the AAT3152 is equipped with built- in protection for VOUT short-circuit and auto-disable for load short-circuit 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 AAT3152 is available in a Pb-free, space-saving, thermally-enhanced 12-pin 3x3mm TDFN package.

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    Features

    • VIN Range: 2.7V to 5.5V
    • Fully Programmable Current with Single Wire
    • Eight-Step Current: 20mA to 50μA
    • Individual Main-Sub Group Control
    • Low IQ (50μA) at Light Load
    • Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and VF Coverage
    • Drives 1-4 Channels of LEDs
    • No Inductors, Low Noise Operation
    • 1MHz Constant Switching Frequency
    • Small Application Circuit
    • Built-In Thermal Protection
    • Built-In Auto-Disable for Short-Circuit
    • Automatic Soft Start
    • IQ <1μA in Shutdown
    • Thermally-Enhanced 3x3mm 12-Pin TDFN Package

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

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Output Voltage (V) 4.7  
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 TDFN33-12