Description
This evaluation board, based on the ST1S09I family of synchronous step-down DC-DC converters, is optimized for powering all lowvoltage applications and, generally, replaces high current linear solutions when power dissipation may cause high heating of the application environment. It provides up to 2 A over an input voltage range of 2.7 V to 5.5 V. A high 1.5 MHz switching frequency allows the use of tiny surface-mount components and in addition to the resistor divider to set the output voltage value, an inductor and two capacitors are required. The ST1S09I features an inhibit function. A low output ripple is guaranteed by the current mode PWM topology and by the use of low ESR surface-mount ceramic capacitors. The device is thermally protected and current limited to prevent damage due to accidental shortcircuit. The ST1S09 family is available in the DFN6 3x3

Features
■ Input voltage range: 2.7 V to 5.5 V
■ Output voltage: 1.2 V
■ Max Iout: 2 A
■ High internal switching frequency: 1.5 MHz
■ Inhibit function
■ Short-circuit protection
■ ST1S09I in the DFN6 3x3 package