data brief for further information contact your local stmicroelectronics sales office. march 2008 rev 1 1/4 4 STEVAL-ISA046V2 2 a / 3.3 v high-efficiency synchronous buck converter evaluation board based on the st1s09 with inhibit features input voltage range: 2.7 v to 5.5 v output voltage: 3.3 v max i out : 2 a high internal switching frequency: 1.5 mhz inhibit function short-circuit protection st1s09i in the dfn6 3x3 package description this evaluation board, based on the st1s09i family of synchronous step-down dc-dc 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. 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 short- circuit. the st1s09 family is available in the dfn6 3x3 package. STEVAL-ISA046V2 www.st.com
circuit schematic STEVAL-ISA046V2 2/4 1 circuit schematic figure 1. schematic
STEVAL-ISA046V2 revision history 3/4 2 revision history table 1. document revision history date revision changes 03-mar-2008 1 initial release.
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