Semtech Debuts New SC4809 PWM Controller

Semtech Corp. (Camarillo, CA) announced the SC4809, a highly integrated, high-performance, current-mode, PWM controller for primary-side operation. Offered in a space-saving, 10-pin, MSOP package, the SC4809 is suitable for use in isolated dc/dc and off-line switching power supplies, as well as for building low-power, isolated, forward and flyback-type switching power supplies found in telecom, networking and industrial equipment.

The SC4809 features a programmable switching rate up to 1MHz, a highly accurate and programmable duty cycle, line voltage monitoring with an under-voltage lockout mechanism for the supply voltage, external clock synchronization, low-ripple biphase operation, less than 100µA start-up current, and programmable soft-start operation. The SC4809 comes in two versions: the SC4809A with a turn-on voltage of 4.5V, and the SC4809B with a turn-on voltage of 11.5V. Both are rated for operation over a temperature range from -40 to +105 degrees C.

Production volumes of the SC4809 controller are available now. Pricing starts at $0.94 each in 10,000-unit quantities.