STEVAL-ISA160V1 3 A / 2.3 MHz step-down synchronous switching regulator based on the AST1S31HF in a DFN 3x3 package Data brief Description The STEVAL-ISA160V1 evaluation board is based on the AST1S31HF internally compensated 2.3 MHz fixed-frequency PWM synchronous step-down regulator. The device operates on a 2.8 V to 4.0 V input voltage and provides a regulated output voltage from as low as 0.8 V up to Vin. The peak current mode control with internal compensation delivers a very compact solution with a minimum component count. All the components on the evaluation board are automotive grade. Features AECQ100 qualification 3 A DC output current 2.8 V to 4 V input voltage Output voltage adjustable from 0.8 V 2.3 MHz switching frequency Internal soft-start and enable Integrated 70 m and 55 m power MOSFETs All ceramic capacitor Power good (POR) Cycle by cycle current limiting Current fold back short circuit protection VFDFPN 3x3 - 8L package RoHS compliant February 2016 DocID029028 Rev 1 For further information contact your local STMicroelectronics sales office 1/4 www.st.com Schematic diagram 1 STEVAL-ISA160V1 Schematic diagram Figure 1: STEVAL-ISA160V1 circuit schematic GSPG2202161045SG VIN U1 2 3 PGND EN SW FB VIN_SW AGND PGOOD 9 4 VIN_A ePAD 1 C3 1uF AST1S31HF R3 R1 10K 100K R2 200K 2/4 DocID029028 Rev 1 8 L1 7 6 VOUT 0.91uH 5 C1 47uF C2 22uF STEVAL-ISA160V1 2 Revision history Revision history Table 1: Document revision history Date Version Changes 25-Feb-2016 1 Initial release. DocID029028 Rev 1 3/4 STEVAL-ISA160V1 IMPORTANT NOTICE - PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries ("ST") reserve the right to make changes, corrections, enhancements, modifications, and improvements to ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST's terms and conditions of sale in place at the time of order acknowledgement. Purchasers are solely responsible for the choice, selection, and use of ST products and ST assumes no liability for application assistance or the design of Purchasers' products. No license, express or implied, to any intellectual property right is granted by ST herein. Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product. ST and the ST logo are trademarks of ST. All other product or service names are the property of their respective owners. Information in this document supersedes and replaces information previously supplied in any prior versions of this document. (c) 2016 STMicroelectronics - All rights reserved 4/4 DocID029028 Rev 1