data brief for further information contact your local stmicroelectronics sales office. july 2009 doc id 15977 rev 1 1/4 4 STEVAL-ISA049V2 synchronous dual buck converter with inhibit demonstration board ba sed on the st2s06b features step-down current mode pwm (1.5 mhz) dc-dc converter fixed or adjustable output voltage from 0.8 v 2% dc output voltage tolerance synchronous rectification inhibit function internal soft start for start-up current limitation and power on delay of 50-100 s typical efficiency: > 90% 0.5 a output current capability non-switching quiescent current: max 1 ma overtemperature range r ds(on) 150 m (typ.) uses tiny capacitors and inductors rohs compliant description this demonstration board is based on the st2s06b, a dual synchronous step-down dc-dc converter optimized for powering low-voltage digital cores in odd applications and, generally, used to replace the high current linear solution when the power dissipation may cause a high heating of the application environment. it provides up to 0.5 a over an input voltage range of 2.5 v to 5.5 v. a high switching frequency (1.5 mhz) allows the use of tiny surface-mount components. a resistor divider to set the output voltage value, an inductor and two capacitors are required for every channel. in addition, a low output ripple is guaranteed by the current mode pwm topology and by the use of low esr surface-mount ceramic capacitors. the demoboard is thermal protected and current limited to prevent damage due to accidental short- circuit. STEVAL-ISA049V2 www.st.com
circuit schematic STEVAL-ISA049V2 2/4 doc id 15977 rev 1 1 circuit schematic figure 1. schematic diagram 6 o u t ' . $ 3 7 6 o u t 6 & " # , , 2 3 4 3 " 6 i n # 2 ' . $ 6 ) . ? 3 7 6 ) . ? ! 6 ) . (
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STEVAL-ISA049V2 revision history doc id 15977 rev 1 3/4 2 revision history table 1. document revision history date revision changes 01-jul-2009 1 initial release.
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