A6985F Datasheet, PDF (1/77 Pages) STMicroelectronics – 38 V 500 mA synchronous step-down switching regulator

A6985F
38 V 500 mA synchronous step-down switching regulator
with 30 µA quiescent current
Datasheet - production data
HTSSOP16 (R_TH = 40 °C/W)
Features
 AECQ100 qualification
 0.5 A DC output current
 4 V to 38 V operating input voltage
 Low consumption mode or low noise mode
 30 µA I_Q at light-load (LCM V_OUT = 3.3 V)
 8 µA I_Q-SHTDWN
 Fixed output voltage (3.3 V and 5 V) or
adjustable from 0.85 V to V_IN
 Adjustable f_SW (250 kHz - 2 MHz)
 Embedded output voltage supervisor
 Synchronization
 Adjustable soft-start time
 Internal current limiting
 Overvoltage protection
 Output voltage sequencing
 Peak current mode architecture
 R_{DSON HS} = 360 m, R_{DSON LS} = 150 m
 Thermal shutdown
Description
The A6985F automotive grade device is a step-
down monolithic switching regulator able to
deliver up to 0.5 A DC. The output voltage
adjustability ranges from 0.85V 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.
Applications
 Designed for automotive systems
 Battery powered applications
 Car body applications (LCM)
 Car audio and low noise applications (LNM)
April 2015
This is information on a product in full production.
DocID027738 Rev 2
1/77
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