2A Driver IC for High Intensity LED Camera Flash

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Manufacturer Skyworks


Description :

The AAT1282 is a high-efficiency, high-current step-up converter capable of 2A maximum output current. It is an ideal power solution for LED photo flash applications in all single cell Li-ion powered products. The AAT1282 maintains output current regulation by switching the internal high-side and low-side switch transistors. The transistor switches are pulse-width modulated at a fixed frequency of 2MHz. The high switching frequency allows the use of a small inductor and output capacitor, making the AAT1282 ideally suited for small battery-powered applications. A high-capacity Super Capacitor on the secondary side of the step-up converter provides the high-peak flash LED current, thereby reducing the peak current demand from the Li-ion battery. To achieve this, the step-up converter features a fixed, input current limiter. An industry-standard I²C serial digital input is used to enable, disable and set the movie-mode current for each flash LED with up to 16 movie-mode settings. The AAT1282 also includes a separate Flash Enable input to initiate both the flash operation and the default timer which can be used either to terminate a flash event at the end of a user-programmed delay or as a safety feature. The AAT1282 contains a thermal management system to protect the device in the event of an output short-circuit condition. Built-in circuitry prevents excessive inrush current during start-up. The shutdown feature reduces quiescent current to less than 1.0µA. The AAT1282 is available in a Pb-free, thermally enhanced 14-pin 3x3mm TDFN package.

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    • VIN Range: 2.7V to 5.5V
    • Dual Channel Output
    • Up to 2A Regulated Output Current
    • 1A per channel
    • Integrated Fixed Input Current Limit
    • 800mA
    • Suited for Super Capacitor Applications
    • Up to 80% Efficiency with Small Magnetics
    • 2MHz Switching Frequency
    • Independent Flash Enable
    • User-programmable Safety Timer
    • Single Resistor Sets Flash and Movie-mode Current
    • Two Wire, I2C Compliant Serial Interface:
    • Fast, 400kHz Serial Transfer Rate
    • 16 level Movie-mode Current
    • Flash/Movie-mode
    • Current Output Channel Control
    • Safety Timer
    • True Load Disconnect
    • Supply Current in Shutdown: <1.0μA
    • TDFN33-14 Package

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Features Similar products
Control scheme PWM  

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Switching frequency (kHz) 2000  
Max Input Voltage (V) 2.7 to 5.5  
Output Voltage (V) 5.5  
Typ. Active Current (µA) 570  
Output Capacitor Type 2.2 μF, Ceramic Capacitor  
Output Current (mA) 274  
Operating Temperature (°C) -40 to +85  
Package TDFN33-14