STEVAL-ISA158V1 STMicroelectronics

S T E VA L - I S A 1 5 8 V 1 38 V, 2 A synchronous step-down switching regulator evaluation board based on the A6986 Data brief Description The STEVAL-ISA158V1 is a product evaluation board based on ST s A6986, a 38 V, 2 A synchronous step-down switching regulator with 30 A of quiescent current. It is designed for automotive system battery-powered applications. It can be used in low consumption mode (LCM) such as in car body implementations, or in low noise mode (LNM) such as in car audio applications. Features 4 V to 38 V operating input voltage Low consumption mode or low noise mode 30 A IQ at light load (LCM VOUT = 3.3 V) 5 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 Adjustable soft-start time Internal current limiting Overvoltage protection Output voltage sequencing Peak current mode architecture RDS(on)HS = 180 m RDS(on)LS = 150 m Thermal shutdown RoHS compliant January 2015 DocID027297 Rev 1 1/5 www.st.com For further information contact your local STMicroelectronics sales office Schematic diagram STEVAL-ISA158V1 1 Schematic diagram Figure 1: STEVAL-ISA158V1 circuit schematic GSPG1212141030SG 2/5 DocID027297 Rev 1 TTPP11 R11 10 R5 NM TP2 R10 0 SS/INH RST U1U1 L6986 TTPP33 R6 1M TP4 4 1 SYNCH RST J3 SYNCH 15 16 VOUT VIN VBIAS VIN FLT L1 10uH 2 13 VCC LX 14 R3 NM LX 5 FSW J2 R1 0 6 ML F C7 NM 9 FB 3 SS/INH R8 130k C8 120p R9 62k R7 180k 8 7 DELAY COM P ++ C11 C3 R2 R4 C4 2.2p NM 0 EP SGND PGND PGND NM 470nF 10 V C5 C6 17 10 11 12 J1J1 68nF 10nF signal GND TTPP77 power GND PGND GND L3 TP8 TP5 L2 4.7uH VIN FLT VIN NM VIN EM I size 0805 TTPP66 PGND GND CC1133 NM C1C1 10uF10uF 50V50V C16 NM C2C2 1uF1uF 50V50V C15 4.7uF C14 4.7uF C9C9 47uF47uF 16V16V CC1100 NMNM