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 (µC, 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. Product status link A6986H Automotive 38 V, 2 A synchronous step-down switching regulator with 30 μA quiescent current A6986H Datasheet DS12861 - Rev 3 - August 2020 For further information contact your local STMicroelectronics sales office.

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 µA IQ at light-load (LCM VOUT = 3.3 V)
■ 8 µA IQ-SHTDWN
■ Adjustable fSW (250 kHz - 2 MHz)
■ Fixed output voltage (3.3 V and 5 V) or adjustable from 0.85 V to VIN
■ 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 mΩ, RDS(on) LS = 150 mΩ

Applications
■ Designed for automotive systems
■ Battery powered applications
■ Car body applications (LCM)
■ Car audio and low noise applications (LNM)