1-Cell synchronous boost converter 97% efficient

28 February 2001 Power Electronics / Power Management

Linear Technology's LTC3401, a high efficiency synchronous step-up DC-DC converter in a 10-lead MSOP package, operates from an input voltage as low as 0,85 V (single alkaline cell). The LTC3401 can deliver over 500 mA of low noise output current with up to 97% efficiency and draws only 38 µA of supply current in Burst Mode (less than 1 µA in shutdown) according to the company.

Switching frequencies from 300 kHz to 3 MHz may be programmed with an external timing resistor which allows designers to optimise their circuit for the highest possible efficiency or the smallest PCB footprint. As a synchronous converter, the LTC3401 does not require a large rectifier diode and its high frequency operation allows the use of very small surface mount inductors and capacitors. The LTC3401 is ideally suited for a variety of compact portable applications.

The LTC3401 incorporates a 0,16 Ohm N-Channel MOSFET switch and a 0,18 Ohm synchronous rectifier to achieve its high efficiency. Its current mode architecture with adaptive slope compensation facilitates loop compensation, which results in excellent transient load response. The device offers user controlled burst mode operation whereby the internal power MOSFETs operate intermittently based on load demand. Its oscillator can be synchronised to an external clock for improved suppression of switching harmonics in sensitive audio and IF bands. It has fixed frequency operation to 3 MHz and permits a total circuit solution size of 6 x 12 mm

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