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'Smallest' DC/DC converter remits high performance

Posted: 12 Jun 2008 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converter? cell battery? voltage?

National Semiconductor Corp. recently launched what it claims as the industry's smallest 4MHz synchronous step-down DC/DC converter that provides up to a 1A output current over an input voltage range from 2.3V to 5.5V. The LM3691 DC/DC converter is optimized for powering high-performance processors from a single Li-ion cell battery in mobile phones, personal media players and other mobile devices.

A member of National's PowerWise energy-efficient product family, the new converter features peak efficiency of 95 percent, low quiescent current to maximize battery life and output voltage precision of 1 percent to power baseband and next-generation applications processors.

The LM3691 is offered in a micro SMD package and features high-switching frequency up to 4MHz that enables the use of miniature 1uH multilayer inductors and small 4.7?F capacitors for a solution size of less than 15mm2. Several fixed output voltage options are also available.

The tiny DC/DC converter is believed to feature excellent transient performance of 40mV for stable output voltages. An integrated mode-control pin allows the design engineer to select forced pulse-width modulation (PWM) mode or auto mode, which changes modes between economy or ECO (gated PWM mode) and PWM automatically, depending on the load. In ECO mode, the LM3691 offers high efficiency and very low quiescent current at 63?A under light load conditions. ECO mode extends the battery life through reduction of the quiescent current during light load currents and system standby. The LM3691 is offered in a 6pin, 1.26mm x 1.56mm micro SMD package.

- Gina Roos

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