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Low-voltage LED ICs designed for battery-powered applications

Posted: 15 Nov 2010 ?? ?Print Version ?Bookmark and Share

Keywords:LED? ZLED? DC-DC converter?

ZMD AG unveiled the second wave of its ZLED family of LED control solutions, this time featuring two low-voltage ICs designed for battery-powered handheld devices.

The ZLED7012 and ZLED7022, both available in the ultra-small UTQFN package (2x2mm), feature low-noise, constant-frequency charge pump DC-DC converters that can drive up to four or six strings of LEDs, respectively. Only three external components are required, according to ZMD.

The devices can operate with DC voltage supplies ranging from 2.8V to 5.5V. Aside from mobile phones, PDAs, GPS and navigation systems, they may also be used in digital photo frames, low-voltage LED lighting fixtures, and general-purpose low-voltage industrial and consumer applications.

Designers can enable and disable the LEDs and set the current level using the pulse count control serial digital input. The programmable current levels range from 1.8mA to 20mA per LED channel.

Other key features include integrated soft-start circuitry to protect against excessive in-rush current during power-on, a low-current shutdown mode that reduces quiescent current consumption to about 1?A, and a temperature operating range of -40C to +85C.

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