AAT1277

1.5A Step-Up Current Regulator for Flash LEDs

Please note: this product is being discontinued and is not recommended for new designs.

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.

Data Sheets Receive a sample

Talk to Sales ECAD Model

Specifications

Flash I_OUT Total (mA)1500

Movie Mode I_OUT Total (mA)100

LED Channels2

Min. V_IN (V)2.7

Max. V_IN (V)5.5

Max. V_OUT (V)5.5

InterfaceEnable

Max. Shutdown Current (μA)1

Typ. I_Q (μA)230

Peak Efficiency85%

Package

Package (mm)—

PackageWLCSP-18

Features

V_IN 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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