STEVAL-ISA207V1 STMicroelectronics

STEVAL-ISA207V1 Data brief 3 A step down DC/DC switching regulator (VIN = 4.5 V to 60 V) based on the A7987 Features 4.5 V to 60 V input voltage Step-down (buck) conversion 3.3 V output voltage Up to 3 A DC output current 500 kHz switching frequency 3.5 ms programmed soft-start Compliant with ceramic output capacitors 180 out-of-phase synchronization available Auto recovery overcurrent and thermal protection RoHS and China RoHS compliant WEEE compliant (2012/19/UE RAEE II) Description The STEVAL-ISA207V1 evaluation board is a step-down switching power supply based on the A7987 regulator in an HTSSOP16 package. It is designed for automotive system battery-powered applications. The output voltage can be set starting from 0.8 V. Almost low drop-out operation, due to the advanced integrated switch management, can be achieved. The A7987 is a 61 V, 3 A step-down asynchronous switching regulator with embedded high-side power MOSFET is capable of delivering up to 3 A of current, Product summary depending on the application conditions. 3 A step down DC/DC The embedded switchover feature on the VBIAS pin and the light load management switching regulator (VIN = STEVAL- 4.5V to 60 V) based on the ISA207V1 (pulse skipping) are included to maximize power conversion efficiency across the A7987 entire load range, and the soft-start current limit threshold and switching frequency can be adjusted according to specific application requirements. 61 V 3 A asynchronous step-down switching The device includes an internal 250 kHz oscillator that can be set up to 1.5 MHz by regulator with adjustable A7987 changing an on-board resistor. Two A7987 regulators can be synchronized in a 180 current limitation for out-of-phase configuration for reduced total input RMS current. automotive DB3887 - Rev 1 - April 2019 www.st.com For further information contact your local STMicroelectronics sales office.STEVAL-ISA207V1 Schematic diagram DB3887 - Rev 1 page 2/4 1 Schematic diagram Figure 1. STEVAL-ISA207V1 board schematic R1 NM TP1 PGOOD R10 0 U1 TP2 R2 100k TP4 7 12 VOUT SYNCH SYNCH PGOOD TP3 L2 4.7uH R14 0R 2 1 VIN VIN VBIAS 3 C13 VIN R3 0R 15 R4 BOOT R15 100nF R12 0 N.M. C7 A7987 4 L1b 10uH VCC 100k 100nF TP5 5 13 L1 10uH EN EN LX 14 LX 6 R5 120 C8 4.7nF SS 9 FB 10 FSW R6 1k C9 47nF R7 7.5k 11 8 ILIM TP GND COMP C14 C11 680pF 17 16 R8 R9 N.M. D1 C12 47k NM + R11 STPS3L60 TP8 2.4k 33uF GND R13 N.M. signal GND TP6 power GND TP7 GND GND C1 4.7uF 100V C2 4.7uF 100V C3 1uF 100V C4 1uF 100V C10 22nF C5 47uF C6 NM