DC-DC converter switch supports up to three high-power LEDs

Jan 9, 2008 2:17 PM

Texas Instruments has introduced a high-brightness LED driver with an integrated 40 V, 1.2-ampere switch that can drive up to three 1 W LEDs in series. The new TPS61165 device's high-performance features and input voltage range of 3 V to 18 V enable designers to efficiently manage multiple, high-power LEDs used in single-cell, battery-powered applications or point-of-load designs with a 9 V or 12 V bus.

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The TPS61165 enables LED brightness to be controlled by a digital single-wire interface or a PWM signal. The digital interface can program an internal register to set the LED current to one of the 32 logarithmic steps. The converter also comes with built-in protection features such as open LED protection, soft-start, overcurrent limit and over-temperature protection.

In addition to driving illumination LEDs, the TPS61165 can drive backlit LEDs for media form factor displays up to nine inches in diameter—such as those used in ultramobile PCs and LCD photo frames, industrial laser diodes or medical and industrial lighting.

Key features of the TPS61165 include a wide input voltage range up to 18 V, integrated 40 V, 1.2-ampere, high-efficiency switching FET, 90% power efficiency—as well as a 32-step single-wire digital dimming or PWM dimming.

The TPS61165, is available from TI, and comes in a thin 2 mm x 2 mm QFN package. The price in 1000-unit quantities is $1.40.