Vishay Debuts Si9139 Switching Power Supply

Vishay Intertechnology Inc. (Malvern, PA) launched a new dc/dc switching power supply controller that combines the functions of three PWM and PSM converter ICs in a single device. Aimed at power conversion applications in consumer appliances such as set-top boxes, DVD players, notebook computers, and telecom and broadband networks, the new Si9139 power supply controller takes a 4.5V to 30V input voltage and converts it to three individual, tightly regulated, dc/dc converter outputs, and one 5V output.

Offering power conversion efficiency in the 95 percent range, the Si9139 integrates two main synchronous step-down controllers operating at up to 6A, each with seven fixed outputs from 1.5V to 3.3V, and an adjustable step-up/down controller whose output can be set to any value between 1.24V and 20V with an external resistor divider. The adjustable capability on the third output at 500mA is an industry first for any such device, according to the company. An on-board 5V, 30mA linear regulator provides an effective fourth output.

Packaged in the 28-pin SSOP, samples and production quantities of the Si9139 are available now, with lead times of eight weeks for larger orders.