SC195 Buck Regulator

Semtech's SC195 is a high efficiency, 500 mA step down regulator designed to operate with an input voltage range of 2.9 V to 5.5 V. The input voltage range makes it ideal for battery-operated applications with space limitations. The SC195 also includes fifteen programmable output voltage settings that can be selected using the four control pins, eliminating the need for external feedback resistors. The output voltage can be fixed to a single setting or dynamically switched between different levels. Pulling all four control pins low disables the output.

The SC195 operates at a fixed 3.5 MHz switching frequency in normal PWM (pulse-width modulation) mode. A variable frequency PSAVE (power-save) mode is used to optimize efficiency at light loads for each output setting. Built-in hysteresis prevents chattering between the two modes.

The SC195 provides several protection features to safeguard the device under stressed conditions. These include short circuit protection, overtemperature protection, under-voltage lockout, and soft-start to control in-rush current. These features, coupled with the small 1.5 x 1.5 x 0.6 mm package make the SC195 a versatile device ideal for step-down regulation in products needing high efficiency and a small PCB footprint.