SC1104A

POWER MANAGEMENT Description SC1104A/B Simple, Synchronous Voltage Mode PWM Controller Features The SC1104A/B is a versatile voltage-mode PWM controller designed for use in single ended DC/DC power supply applications. A simple, fixed frequency high efficiency buck regulator can be implemented using the SC1104A/B with a minimum of external components. Internal level shift and drive circuitry eliminates the need for an expensive P-channel, high-side switch. The small device footprint allows for compact circuit design. SC1104A/B features include temperature compensated voltage reference, triangle wave oscillator, current limit comparator and an externally compensated error amplifier. Current limit is implemented by sensing the voltage drop across the top FET’s RDS(ON). The SC1104 operates at fixed frequencies of 300kHz(A) or 600kHz(B) providing an optimum compromise between efficiency, external component size, and cost. 600kHz switching frequency is reserved for the SC1104B, +5VCC op...