STEVAL-ISA045V2 STMicroelectronics

STEVAL-ISA045V2 2 A / 3.3 V high-efficiency synchronous buck converter evaluation board based on the ST1S09 Data Brief Features Input voltage range: 2.7 V to 5.5 V Output voltage: 3.3 V Max I : 2 A out High internal switching frequency: 1.5 MHz Short-circuit protection ST1S09 in the DFN6 3x3 package Description This evaluation board, based on the ST1S09 family of synchronous step-down DC-DC STEVAL-ISA045V2 converters, is optimized for powering all low- voltage 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. 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 short- circuit. The ST1S09 family is available in the DFN6 3x3 package. March 2008 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4Circuit schematic STEVAL-ISA045V2 1 Circuit schematic Figure 1. Schematic VIN A 5 Vin VIN SW 4 ST1S09 L1 SW Voouut 3 R3 PG 6 GND VVFFB 2 1 R1 C1 C2 R2 GND 2/4