AAT3169 High Efficiency 1X/1.5X/2X Charge Pump for White LED Applications

Manufacturer's part number :

AAT3169ITO-T1

Manufacturer Skyworks

Skyworks

Description :

The AAT3169 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 AAT3169 is capable of driving six LEDs for 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 IN and OUTCP) 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 115μA. For optimized efficiency, low-current settings require only 65μA of housekeeping current. Each output of the AAT3169 is equipped with built-in protection for output short-circuit and auto-disable for load short-circuit conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up. A lowcurrent shutdown feature disconnects the load from the input and reduces quiescent current to less than 1μA. The AAT3169 is available in a Pb-free, space-saving, thermally-enhanced 16-pin 4x4mm QFN package, a 14-pin 3x3mm TDFN package, a low-profile 14-pin 3x3mm STDFN package or a 14-pin TSOPJW package and is rated over the -40°C to +85°C temperature range.

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    Features

    • 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 115μA
    • Low IQ (65μA) for Single-Channel, Low-Current Mode
    • Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum Efficiency and VF Coverage
    • Drives Up to Six LEDs
    • Individual Main-Sub (5-1) 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 TDFN33-14, STDFN33-14, QFN44-16, or TSOPJW-14 Package

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

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Output Voltage (V) 4.7  
Typ. Quiescent Current (µA) 65  
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 TSOPJW-14