STEVAL-ISA190V1 STMicroelectronics

S T E VA L - I S A 1 9 0 V 1 38 V, 1.5 A synchronous step-down switching regulator evaluation board based on A6986F Data brief Output voltage sequencing Peak current mode architecture RDS(on)HS = 180 m RDS(on)LS = 150 m Thermal shutdown RoHS compliant Description The STEVAL-ISA190V1 is a product evaluation board based on ST s synchronous step-down switching regulator A6986F. The device is capable of delivering up to 1.5 A and its 100% duty cycle capability to withstand the cold crank event along with its wide input operating voltage range make A6986F the ideal choice for battery powered automotive systems. Synchronous rectification improves efficiency at full load as well as application compactness, while high-frequency switching (programmable up to 2 MHz) lowers power passive costs and Features size while remaining outside of the AM band. AECQ100 qualification 1.5 A DC output current The device can operate in low consumption 4 V to 38 V operating input voltage mode (LCM) with quiescent current as low as 30 A at V = 12 V and V = 3.3 V, hence Low consumption mode or low noise mode IN OUT assuring high efficiency at light loads, as required Programmable I current SKIP in typical car body applications that remain active 30 A IQ at light load (LCM VIN = 12 V and while the car is parked. A low noise mode (LNM) V = 3.3 V) OUT can alternatively be selected to meet the forced 8 A I Q-SHTDWN PWM mode requirement under all loading Adjustable f (250 kHz - 2 MHz) SW conditions for infotainment applications. Output voltage adjustable from 0.85 V to VIN Embedded output voltage supervisor The default evaluation board settings are 6 V Synchronization output voltage configured in LCM, 500 kHz Adjustable soft-start time switching frequency, high level ISKIP current and the switchover feature disabled. These Internal current limiting configurations can easily be changed by the user Overvoltage protection to evaluate different application scenarios. May 2016 DocID029293 Rev 1 1/5 www.st.com For further information contact your local STMicroelectronics sales office Schematic diagram STEVAL-ISA190V1 1 Schematic diagram Figure 1: STEVAL-ISA190V1 circuit schematic GSPG0205161515SG 2/5 DocID029293 Rev 1 TP1 R11 10 R5 NM TP2 RST SS/INH R10 NM U1 A6986F TP3 R6 1M TP4 4 1 VOUT SYNCH SYNCH RST J3 VIN FLT 15 16 VIN VBIAS L1 10uH 2 13 VCC LX J5 14 R3 NM LX L1A NM 5 FSW J2 R1 0 6 C7 NM MLF 9 VOUT 3 SS/INH R8 100k C8 120pF R9 33k R7 200k 8 7 DELAY COMP + C11 C3 R2 R4 + NM 0 EP SGND PGND PGND NM 470nF 10V C4 2.2p C5 C6 17 10 11 12 J1 68nF 10nF signal GND TP7 PGND power GND GND J4 TP8 L3 TP5 L2 4.7uH VIN FLT VIN MPZ2012S221A VIN EMI TP6 PGND GND C13A NM NM C13 C1 10uF 50V C2 1uF 100V C16 4.7uF 50V C15 4.7uF 50V C14 4.7uF 50V C9 10uF 50V C10 10uF 50V