High-current flash LED drivers target high-end cell phones

Sunnyvale, Calif. — Advanced Analogic Technologies Inc. (AnalogicTech) has introduced the first device in a family of flash LED products capable of driving either two LEDs up to 500 mA or a single LED up to 1 A. Designed to be used with newer-generation, high-current/high-brightness flash LEDs in mobile phones with video recording, the AAT1270 step-up current regulator, housed in a single 3 x 3-mm STDFN package, delivers high current levels needed to support flash lighting for higher resolution CCD imagers.

The dual-channel AAT1270 uses a high efficiency dc/dc boost converter with small magnetics, and does not require an external Schottky diode. The device's high 2-MHz switching speed and low input current ripple permit the use of a low-profile (0.9 mm high) 1 uH inductor. Operating off a single-cell Lithium-ion power source, the AAT1270 extends battery life by operating at efficiency levels of up to 85 percent.

To protect against thermal damage to the flash LEDs, the AAT1270 features a user-programmable safety timer that can be used to terminate a flash event after a prescribed length of time. A separate flash enable pin can be used to initiate both the flash/strobe operation and the safety timer. The AAT1270 also features an asynchronous flash inhibit pin which reduces flash current to movie mode level during periods of high battery demand.

The AAT1270 adds over-voltage, short-circuit and over-temperature protection to protect the device. Built-in circuitry prevents excessive in-rush current during startup. An automatic shutdown current feature reduces quiescent current to <1.0 uA. The AAT1270 is qualified over the -40°C to +85°C temperature range and is packaged in a Pb-free, 3 x 3-mm, 14-pin STDFN.

Pricing: $1.42 in 1000-unit quantities.
Product information: AAT1270

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