STEVAL-ISA205V1 Data brief 38 V, 2 A synchronous step-down switching regulator evaluation board based on the A6986H Features * * * * * AECQ100 qualification 2 A DC output current 4 V to 38 V operating input voltage Low consumption mode or low noise mode Programmable ISKIP current * 30 A IQ at light load (LCM VIN = 12 V and VOUT = 3.3 V) * 8 A IQ-SHTDWN * Adjustable fSW (250 kHz - 2 MHz) * Output voltage adjustable from 0.85 V to VIN * * Embedded output voltage supervisor Synchronization (in all fSW range) * * * * * Adjustable soft-start time Internal current limiting Overvoltage protection Peak current mode architecture RDS(on)HS = 180 m; RDS(on)LS = 150 m * * Thermal shutdown RoHS and WEEE compliant Product summary Description 38 V, 2 A synchronous step-down switching regulator evaluation board based on A6986H STEVALISA205V1 38 V, 2 A synchronous step-down switching regulator with 30 A quiescent current A6986H The STEVAL-ISA205V1 product evaluation board is based on the synchronous stepdown switching regulator A6986H that can deliver up to 2 A and withstand cold cranking across 100% duty cycle, which, along with its wide input operating voltage range, render the A6986H the ideal choice for battery powered automotive systems. Synchronous rectification helps to achieve higher efficiency at full load as well as application compactness, while high-frequency switching (programmable up to 2 MHz) helps to cut power passive costs and size, while staying outside of the AM band. The device can operate in a Low Consumption Mode (LCM) with a quiescent current down to 30 A at VIN = 12 V and VOUT = 3.3 V, hence assuring high efficiency at light loads, as required in typical car body applications that are active during car parking. A Low Noise Mode (LNM) is also available to meet the requirements of infotainment applications of forced PWM mode in all loading conditions. The default configuration of the board is output voltage set to 3.3 V configured in LCM, 500 kHz switching frequency, ISKIP current set to high level and the switchover feature disabled. All of these settings can be easily changed by the user to evaluate different application scenarios. DB3889 - Rev 1 - April 2019 For further information contact your local STMicroelectronics sales office. www.st.com Schematic diagram Figure 1. STEVAL-ISA205V1 board schematic R5 U1 2 NM 5 R1 0 6 3 8 C11 C3 NM 470nF 10V R2 NM R4 0 SY NCH VIN VCC R6 FB SS/INH DELAY C6 68nF 10nF 17 L1 10uH L1A NM COMP SGND 10 PGND PGND 11 C7 9 7 R8 75k C8 C4 330p VOUT R9 82k R7 NM 240k 2.2p 12 signal GND PGND TP4 J2 MLF C5 1M RST J3 FSW EP J1 size 1206 C2 C1 + C13 R3 1uF 10uF NM NM C13A 50V 50V J5 A6986H 1 RST 16 VBIAS 13 LX 14 LX power GND size 1206 4 15 TP2 10uF 50V TP3 SY NCH VIN_FLT + NM C10 10 NM 10uF 50V R11 R10 C9 TP1 SS/INH size 1206 DB3889 - Rev 1 1 TP7 GND J4 size XAL5030 Coilcraft L3 TP5 VIN 4.7uH VIN_FLT TP8 4.7uF C14 size 1206 C15 4.7uF VIN_EMI size 1206 size 1206 C16 4.7uF MPZ2012S221A size 0805 TP6 GND L2 PGND STEVAL-ISA205V1 page 2/4 STEVAL-ISA205V1 Revision history Table 1. Document revision history DB3889 - Rev 1 Date Version 02-Apr-2019 1 Changes Initial release. page 3/4 STEVAL-ISA205V1 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. For additional information about ST trademarks, please refer to www.st.com/trademarks. 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) 2019 STMicroelectronics - All rights reserved DB3889 - Rev 1 page 4/4