1.5A Step-Up Current Regulator for Flash LEDs

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Manufacturer Skyworks


Description :

The AAT1277 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 AAT1277 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 AAT1277 ideally suited for small battery-powered applications. Three simple logic control inputs enable and disable flash and movie mode operation of the AAT1277. Movie-mode and Flash-mode current levels are independently fixed by two separate resistors. For Flash mode, a default timer can be used either to terminate a flash event or as a safety feature. Also included is a Flash Inhibit pin which reduces the flash current to movie-mode levels during high battery demand. One or two LEDs can be connected to the AAT1277; in the case of two LEDs the output current is matched between each diode. The AAT1277 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 AAT1277 is available in a 18 ball 1.5mm x 2.4mm CSP 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/Movie Mode Enable
    • Separate Flash Inhibit
    • User-Programmable Safety Timer
    • Two Resistors Set Flash and Movie Mode Current Independently
    • True Load Disconnect
    • Bypass Mode Input Current Limit 1.9A (typ.)
    • Over-Voltage (Open LED, Open Circuit) Protection
    • Short Circuit Protection
    • Over-Temperature Protection
    • Shutdown Current < 1.0μA
    • 18 Ball 1.5mm x 2.4mm CSP Package
    • -40°C to +85°C Operating Temperature Range

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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) 1400  
Output Capacitor Type 1 μF, Ceramic Capacitor  
Output Current (mA) 1500  
Operating Temperature (°C) -40 to +85  
Package CSP-18