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STMicroelectronics - synchronous step-down switching regulator

Numéro de référence A6985F
Description synchronous step-down switching regulator
Fabricant STMicroelectronics 
Logo STMicroelectronics 





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A6985F fiche technique
A6985F
38 V 500 mA synchronous step-down switching regulator
with 30 µA quiescent current
Datasheet - production data
HTSSOP16 (RTH = 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 IQ at light-load (LCM VOUT = 3.3 V)
8 µA IQ-SHTDWN
Fixed output voltage (3.3 V and 5 V) or
adjustable from 0.85 V to VIN
Adjustable fSW (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
RDSON HS = 360 m, RDSON 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
www.st.com

PagesPages 30
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