AAT1282

2A Driver IC for High Intensity LED Camera Flash


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.

Please note: AAT1282 is not recommended for new designs.

Specifications

Flash IOUT Total (mA)2000
Movie Mode IOUT Total (mA)274
LED Channels2
Min. VIN (V)2.7
Max. VIN (V)5.5
Max. VOUT (V)N/A
InterfaceI²C
Max. Shutdown Current (μA)1
Typ. IQ (μA)570
Peak Efficiency80%
PackageTDFN, 14L
Package (mm)3 x 3 x 0.75
PackageTDFN33-14

Features

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

Product Documents

Applications

Cameras

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