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.

Data Sheets Receive a sample

Talk to Sales ECAD Model

Specifications

Flash I_OUT Total (mA)2000

Movie Mode I_OUT Total (mA)274

LED Channels2

Min. V_IN (V)2.7

Max. V_IN (V)5.5

Max. V_OUT (V)N/A

InterfaceI²C

Max. Shutdown Current (μA)1

Typ. I_Q (μA)570

Peak Efficiency80%

PackageTDFN, 14L

Package (mm)3 x 3 x 0.75

PackageTDFN33-14

Features

V_IN 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

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