Triple output switching power supply controller

26 March 2003 Power Electronics / Power Management

A DC-to-DC switching power supply controller that combines the functions of three PWM and PSM converter ICs in a single device was launched by Vishay's Siliconix subsidiary. Aimed at consumer electronic appliances, the Si9139 takes a 4,5 to 30 V input voltage and converts it to three individual, tightly regulated DC-to-DC converter outputs, and one 5 V output. With 95% power conversion efficiency, the Si9139 integrates two main synchronous step-down controllers operating at up to 6 A, each with seven fixed outputs from 1,5 to 3,3 V, and an adjustable step-up/down controller whose output can be set to any value between 1,24 and 20 V with an external resistor divider. This adjustable capability on the third output at 500 mA is claimed to be an industry first. An on-board 5 V, 30 mA linear regulator provides an effective fourth output. The Si9139 in 28-pin SSOP has a 50 W power rating and ±3% total regulation by line, load, and temperature.

www.vishay.com

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