High Efficiency 1X/1.5X Charge Pump For White LED Applications

Manufacturer's part number :

AAT3151BIWP-T1

Manufacturer Skyworks

Skyworks

Description :

The AAT3151B is a low noise, constant frequency charge pump DC/DC converter that uses a dual mode load switch (1X) and fractional (1.5X) charge pump conversion to maximize efficiency for white LED applications. The AAT3151B is capable of driving four white LEDs at a total of 120mA 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 the AAT3151B 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. The charge pump output of the AAT3151B is equipped with built-in protection for VOUT. Each current sink input has short-circuit and auto-disable to guard against 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 AAT3151B is available in a Pb-free, space-saving, thermally-enhanced, 12-pin 3x3mm TDFN package.

View our wide range of Analogue / Mixed signal products

View our portfolio of Semiconductors

See all products from our supplier Skyworks

RoHS

RoHS

  • Quote and availability

    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 50μA
    • Low IQ (50μA) for Low-Current Mode
    • Dual Mode 1X and 1.5X Charge Pump for Maximum Efficiency and VF Coverage
    • Drives Four 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
    • TDFN33-12 Package

    How wireless works

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

  similar products found

Search similar products
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 TDFN33-12