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Philips dc/dc converter programs output voltage

Posted: 22 Feb 2002 ?? ?Print Version ?Bookmark and Share

Keywords:philips semiconductor? philips? dc/dc converter ic? dc converter ic? dc conversion ic?

Targeted for use in battery-powered communications, computing, and A/V equipment, the TEA1211 dc/dc converter can program its output voltage from 1.5V to 5.5V in 0.1V steps via the I?C bus.

The converter also uses the company's PWM/PFM technology to automatically switch between step-down and step-up operation in response to changing input voltage, and achieve an efficiency of 90 percent in both modes.

Available in an HTSSOP20 package, the company claims that the TEA1211 replaces two separate dc/dc converter ICs with a single IC and an external coil. The chip also provides a talk-time increase of 24 percent in CDMA communication modules and maintains efficiency in cold environments.

"Today's Li-ion and lithium-polymer battery packs start off delivering 4.2V when charged, but drop to 2.7V as they approach discharge," explained G Hulsmans, product marketing manager for dc/dc converter ICs at Philips Semiconductors.

"Therefore if your equipment needs a supply voltage of 3.3V, you have to combine a step-down converter with a step-up converter to get the highest possible battery efficiency. The TEA1211 also provides a single platform on which portable equipment designers can build a wide range of software-controlled power-management architectures," he adds.

The company has also released the UDA1352TS and UDA1352HL decoders, for use in active speakers and sound cards. Both chips are low-cost versions of the company's UDA1351 chip.

Housed in an SSOP28 package, the UDA1352TS features an on-board DAC and can be controlled via an L3 microcontroller and an I?C bus.





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