data brief for further information contact your local stmicroelectronics sales office. december 2011 doc id 022621 rev 1 1/4 4 STEVAL-ISA094V1 3 a step-down switching power supply demonstration board based on the l7981 (hsop8) features 3 a dc output current 4.5 v to 28 v input voltage output voltage adjustable from 0.6 v 250 khz switching frequency, programmable up to 1 mhz internal soft-start and enable low dropout op eration: 100% duty cycle voltage feed-forward zero load current operation overcurrent and thermal protection rohs compliant description the STEVAL-ISA094V1 is a step-down switching power supply based on stmicroelectronics? l7981 switching regulato r in an hsop8 package. the l7981 features an embedded power mosfet and is capable of delivering up to 3 a of current to the load, depending on the application conditions. the input voltage can range from 4.5 v to 28 v, while the output voltage can be set from 0.6 v to v in . requiring a minimum number of external components, the device includes an internal 250 khz switching frequency oscillator that can be externally adjusted up to 1 mhz. STEVAL-ISA094V1 www.st.com
schematic diagram STEVAL-ISA094V1 2/4 doc id 022621 rev 1 1 schematic diagram figure 1. STEVAL-ISA094V1 circuit schematic ! - 6 6 ) . 6 # # 6 / 5 4 6 / 5 4 6
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