1.5A Step-Up Current Regulator for Flash LEDs

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Manufacturer Skyworks


Description :

The AAT1272 is a high-efficiency, high-current boost converter capable of 1.5A typical output current. It is an ideal power solution for LED photo flash applications in all single cell Li-ion powered products. The AAT1272 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 AAT1272 ideally suited for small battery-powered applications. 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 AAT1272 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 maximum flash and movie-mode current is set by one external resistor; the ratio of Flash to Movie-mode current is set at approximately 7.3:1. One or two LEDs can be connected to the AAT1272; in the case of two LEDs the output current is matched between each diode. The AAT1272 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 AAT1272 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 1.5A Regulated Output Current (750mA per channel)
    • Up to 85% Efficiency with Small Inductor (1μH)
    • 2 MHz Switching Frequency
    • Separate 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
    • Input Current Limit
    • Over-Voltage (Open LED, Open Circuit), Short Circuit, and Over-Temperature Protection
    • Shutdown Current < 1.0μA
    • 14-pin TDFN 3x3 mm Package
    • -40°C to +85°C Temperature Range

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Control scheme Current Output Channel Control  

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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) 670  
Output Capacitor Type 2.2 μF, Ceramic Capacitor  
Output Current (mA) 1500  
Operating Temperature (°C) -40 to +85  
Package TDFN33-14