STEVAL-ISA205V1 STMicroelectronics

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 I current SKIP 30 A IQ at light load (LCM V = 12 V and V = 3.3 V) IN OUT 8 A I Q-SHTDWN Adjustable f (250 kHz - 2 MHz) SW Output voltage adjustable from 0.85 V to V IN Embedded output voltage supervisor Synchronization (in all f range) SW Adjustable soft-start time Internal current limiting Overvoltage protection Peak current mode architecture R = 180 m R = 150 m DS(on)HS DS(on)LS Thermal shutdown RoHS and WEEE compliant Product summary Description 38 V, 2 A synchronous step-down switching STEVAL- The STEVAL-ISA205V1 product evaluation board is based on the synchronous step- regulator evaluation board ISA205V1 down switching regulator A6986H that can deliver up to 2 A and withstand cold based on A6986H cranking across 100% duty cycle, which, along with its wide input operating voltage 38 V, 2 A synchronous range, render the A6986H the ideal choice for battery powered automotive systems. step-down switching A6986H regulator with 30 A Synchronous rectification helps to achieve higher efficiency at full load as well as quiescent current 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 V = 12 V and V = 3.3 V, hence assuring high efficiency at light IN OUT 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, I current set to high level and the switchover SKIP feature disabled. All of these settings can be easily changed by the user to evaluate different application scenarios. DB3889 - Rev 1 - April 2019 www.st.com For further information contact your local STMicroelectronics sales office.STEVAL-ISA205V1 DB3889 - Rev 1 page 2/4 1 Schematic diagram Figure 1. STEVAL-ISA205V1 board schematic TP1 R11 10 R5 NM TP2 RST SS/INH R10 NM U1 A6986H TP3 R6 1M TP4 4 1 VOUT SYNCH SYNCH RST J3 VIN FLT 15 16 VIN VBIAS L1 10uH 2 13 VCC LX 14 J5 R3 NM L1A NM LX 5 FSW J2 R1 0 6 MLF C7 NM 9 FB 3 SS/INH R8 75k C8 330p R9 82k R7 240k 8 7 DELAY COMP + C11 C3 R2 R4 C4 2.2p + NM 0 EP SGND PGND PGND NM 470nF 10V C5 C6 17 10 11 12 J1 68nF 10nF signal GND TP7 PGND power GND GND J4 size XAL5030 Coilcraft TP8 L3 TP5 L2 4.7uH VIN FLT VIN MPZ2012S221A VIN EMI size 0805 TP6 PGND GND C13A NM C16 4.7uF NM C13 size 1206 size 1206 C1 10uF 50V C2 1uF 50V C15 4.7uF size 1206 C14 4.7uF size 1206 size 1206 C9 10uF 50V C10 10uF 50V size 1206