STEVAL-ISA049V2 STMicroelectronics

STEVAL-ISA049V2 Synchronous dual buck converter with inhibit demonstration board based on the ST2S06B Data brief 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 150 m (typ.) DS(on) Uses tiny capacitors and inductors RoHS compliant Description STEVAL-ISA049V2 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. July 2009 Doc ID 15977 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 Circuit schematic STEVAL-ISA049V2 1 Circuit schematic Figure 1. Schematic diagram 37 6) . , 2 6O UT 6I N 6& 6) . 3 7 3 4 3 6) . ( 37 2 , (6 6O UT 2E SE T /U T . 6& . 2/4 Doc ID 15977 Rev 1 . W 2