A6986H Datasheet Automotive 38 V, 2 A synchronous step-down switching regulator with 30 A quiescent current Features AEC-Q100 qualified 2 A DC output current 4 V to 38 V operating input voltage Low consumption mode or low noise mode 30 A I at light-load (LCM V = 3.3 V) Q OUT 8 A I Q-SHTDWN Adjustable f (250 kHz - 2 MHz) SW Fixed output voltage (3.3 V and 5 V) or 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 R = 180 m, R = 150 m DS(on) HS DS(on) LS Thermal shutdown Product status link Applications A6986H Designed for automotive systems Battery powered applications Car body applications (LCM) Car audio and low noise applications (LNM) Description The A6986H automotive grade device is a step-down monolithic switching regulator able to deliver up to 2 A DC. The output voltage adjustability ranges from 0.85 V to VIN. The 100% duty cycle capability and the wide input voltage range meet the cold crank and load dump specifications for automotive systems. The low consumption mode (LCM) is designed for applications active during car parking, so it maximizes the efficiency at light-load with controlled output voltage ripple. The low noise mode (LNM) makes the switching frequency constant and minimizes the output voltage ripple overload current range, meeting the low noise application specification like car audio. The output voltage supervisor manages the reset phase for any digital load (C, FPGA). The RST open collector output can also implement output voltage sequencing during the power-up phase. The synchronous rectification, designed for high efficiency at medium - heavy load, and the high switching frequency capability make the size of the application compact. Pulse by pulse current sensing on both power elements implements an effective constant current protection. DS12861 - Rev 3 - August 2020 www.st.com For further information contact your local STMicroelectronics sales office.uC RST 4 1 SYNCH RST 15 16 VIN VIN VBIAS 2 13 VOUT VCC LX 14 10uH LX 5 FSW 10uF 1uF 240k A6986H 6 MLF 9 FB 3 SS/INH 75k 20uF 8 7 DELAY COMP EP SGND PGND PGND 470nF 68nF 10nF 330p 2.2p 82k 17 10 11 12 signal GND power GND GND A6986H Application schematic 1 Application schematic Figure 1. Application schematic DS12861 - Rev 3 page 2/71