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Step-up converter aids design of tiny handhelds

Posted: 19 Nov 2007 ?? ?Print Version ?Bookmark and Share

Keywords:AnalogicTech step-up converter? portable application? AAT1217 compact package?

Advanced Analogic Technologies Inc. (AnalogicTech) introduces a synchronous step-up converter, which offers high output current and low startup voltage in a compact package. Designed to support a wide range of portable applications, the AAT1217 delivers up to 100mA output from a single-cell alkaline battery input, up to 400mA from a dual-cell alkaline battery input and up to 500mA from a single-cell Li-ion battery input while supporting startup as low as 0.85V.

AnalogicTech's AAT1217 operates from a wide input voltage range. It uses a slope compensated current mode PWM control topology and operates at a 1.2MHz constant switching frequency. The high switching frequency allows the use of small surface mount inductors, and an integrated synchronous rectifier eliminates the need for an external Schottky diode.

The AAT1217 switches its internal MOSFETs at high frequency to achieve efficiency levels up to 93 percent. The device also starts up at an input voltage as low as 0.85V and supports continuous operation at an input voltage down to 0.5V. It also features embedded anti-ringing control circuitry that minimizes electromagnetic interference (EMI) by removing the high frequency ringing that appears on the SW pin when inductor current goes to zero. Other features include over-current protection and a low shutdown current of The AAT1217 is qualified across the -40 C to +85 C temperature range. It is available in a Pb-free, low-profile 6-pin TSOT23 package. Price is $0.81 in quantities of 1,000.

- Gina Roos

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