A6986 STMicroelectronics

A6986 38 V, 2 A synchronous step-down switching regulator with 30 A quiescent current Datasheet - production data Description The A6986 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 to withstand the cold crank event and the wide input HTSSOP16 (R = 40 C/W) voltage range make the A6986 device ideal for TH battery powered automotive systems. The Low Consumption Mode (LCM) is designed for applications active during car parking, so it Features maximizes the efficiency at the light-load with the controlled output voltage ripple. The Low Noise AECQ100 qualification Mode (LNM) makes the switching frequency 2 A DC output current constant and minimizes the output voltage ripple 4 V to 38 V operating input voltage overload current range, meeting the low noise application specification like car audio. The output Low consumption mode or low noise mode voltage supervisor manages the reset phase for 30 A IQ at light-load (LCM V = 3.3 V) OUT any digital load ( C, FPGA). The RST open 8 A I Q-SHTDWN collector output can also implement output voltage sequencing during the power-up phase. Adjustable f (250 kHz - 2 MHz) SW The synchronous rectification, designed for high Output voltage adjustable from 0.85 V to V IN efficiency at the medium - heavy load, and the Embedded output voltage supervisor high switching frequency capability makes the size of the application compact. Pulse-by-pulse Synchronization current sensing on both power elements Adjustable soft-start time implements effective constant current protection. Internal current limiting Overvoltage protection Output voltage sequencing Peak current mode architecture R = 180 m , R = 150 m DSON HS DSON LS Thermal shutdown Applications Designed for automotive systems Battery powered applications Car body applications (LCM) Car audio and low noise applications (LNM) August 2020 DocID026211 Rev 8 1/68 This is information on a product in full production. www.st.comContents A6986 Contents 1 Application schematic . 4 2 Pin settings 5 2.1 Pin connection 5 2.2 Pin description 5 2.3 Maximum ratings 6 2.4 Thermal data . 7 2.5 ESD protection 7 3 Electrical characteristics . 8 4 Datasheet parameters over the temperature range . 13 5 Functional description 14 5.1 Power supply and voltage reference 15 Switchover feature . 15 5.2 Voltages monitor 15 5.3 Soft-start and inhibit . 16 5.3.1 Ratiometric startup . 22 5.3.2 Output voltage sequencing 23 5.4 Error amplifier 24 5.5 Light-load operation . 24 5.5.1 Low noise mode (LNM) . 25 5.5.2 Low consumption mode (LCM) . 25 5.6 Switchover feature 28 5.6.1 LCM 28 5.6.2 LNM 28 5.7 Overcurrent protection . 29 OCP and switchover feature . 31 5.8 Overvoltage protection . 33 5.9 Thermal shutdown 34 6 Closing the loop . 35 2/68 DocID026211 Rev 8