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Step-down converters are 95 percent power efficient

Posted: 15 Sep 2008 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC? step-down converter? power consumption?

TB7101AF and TB7102AF monolithic DC/DC converters

Toshiba America Electronic Components Inc. has announced two single-chip DC/DC converter ICs with 1A (max.) output current (Iout). The devices are intended for use as step-down converters in electronic devices to provide a simple power solution with high efficiency of 95 percent (typ.) that helps reduce system power consumption and product size.

Developed by Toshiba Corp., the monolithic DC/DC converters support input voltage (Vin) from 2.7V to 5.5V. They offer a choice of either adjustable output voltage from 0.8V to (Vin-1)V, (typ.), available in the TB7102AF, or fixed output voltage, offered in the TB7101AF, with available output voltages to be specified when ordering of 1.2V, 1.5V, 1.8V, 2.5V or 3.3V. Both devices have low enable threshold voltage (Vih(en)) of 1.5V, and Vil(en) of 0.5V, at Vin of 2.7 and 5V.

The two devices integrate high- and low-side MOSFETs, a PWM controller and MOSFET driver into a single monolithic IC. They also include a selection of built-in functions including synchronous rectification, under voltage lockout, thermal shutdown, overcurrent protection, and soft start time. A high 1MHz oscillation frequency allows use of small external components. The TB7101AF and TB7102AF are offered in compact, low thermal resistance PS-8 packages measuring 2.9mm x 2.8 mm x 0.8mm.

"These single chip buck converters combine low on-state resistance (Rds(on)) internal MOSFETs using synchronous rectification with internal phase compensation to achieve high efficiency with a minimum of external components," said Jeff Lo, business development manager, discrete power devices, for TAEC.

Samples of the Toshiba TB7101AF and TB7102AF monolithic DC/DC converters are available now, with prices in sample quantities starting at 72 cents.

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