STEVAL-ISA187V1 38 V, 0.5 A synchronous step-down switching regulator evaluation board based on A6985F Data brief Description The STEVAL-ISA187V1 is a product evaluation board based on the ST synchronous step-down switching regulator A6985F, which can deliver up to 0.5 A and, with its 100% duty cycle ability to withstand cold crank events and wide input operating voltage range, represents the ideal choice for battery-powered automotive systems. Synchronous rectification helps achieve higher efficiency at full load as well as application compactness, while high-frequency switching (programmable up to 2 MHz) helps reduce the cost and size of power passive components while remaining outside the AM band. Features AECQ100 qualification 0.5 A DC output current 4 V to 38 V operating input voltage Low consumption mode or low noise mode Programmable ISKIP current 30 μA IQ at light load (LCM VIN = 12 V and VOUT =3.3 V) 8 μA IQ-SHTDWN Adjustable f SW (250 kHz - 2 MHz) Output voltage adjustable from 0.85 V to VIN Embedded output voltage supervisor Synchronization Adjustable soft-start time Internal current limiting Overvoltage protection Output voltage sequencing Peak current mode architecture RDS(on)HS = 360 mΩ; RDS(on)LS = 150 mΩ Thermal shutdown RoHS compliant January 2016 The device can operate in low consumption mode (LCM), with a quiescent current of 30 μA at VIN=12 V and VOUT= 3.3 V that ensures high efficiency under light load, which is a requirement in typical car body applications that are active when a car is parked. A low noise mode (LNM) can be selected to meet the requirements of infotainment applications with forced PWM mode under all load conditions. The default board configuration is LCM active, 2 MHz switching frequency, high ISKIP current and the switchover feature enabled, but all of these settings can be easily changed so the user can evaluate different application scenarios. DocID028932 Rev 1 For further information contact your local STMicroelectronics sales office 1/4 www.st.com VIN_FLT GND VIN TP6 TP5 PGND + SYNCH NM C13A L3 J4 MPZ2012S221A + TP3 TP1 NM C13 4.7uF SS/INH 10uF C1 C16 470nF 4.7uH NM L2 PGND VIN_FLT R2 NM 0 R1 C3 NM R3 C11 J5 J1 U1 10nF 17 EP DELAY SS/INH MLF FSW VCC VIN SYNCH 68nF 8 3 6 5 2 15 4 C6 NM 10R C5 VIN_EMI TP8 R4 56k R10 R11 10 SGND R5 COMP FB LX LX VBIAS RST A6985F 11 12 PGND PGND NM 7 9 13 14 16 1 R8 C4 27p power GND signal GND 1.2p 200k C8 J2 R9 33k L1A L1 R6 R7 C7 NM 4.7uH J3 1M 200k NM 10uF C9 50V 1uF C2 4.7uF C15 DocID028932 Rev 1 4.7uF NM 2/4 C10 TP7 TP4 TP2 GND VOUT RST 1 C14 Schematic diagram STEVAL-ISA187V1 Schematic diagram Figure 1: STEVAL-ISA187V1 schematic circuit GSPG27012016DI1116 STEVAL-ISA187V1 2 Revision history Revision history Table 1: Document revision history Date Version Changes 27-Jan-2016 1 Initial release. DocID028932 Rev 1 3/4 STEVAL-ISA187V1 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. © 2016 STMicroelectronics – All rights reserved 4/4 DocID028932 Rev 1 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: STMicroelectronics: STEVAL-ISA187V1
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