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A6985F Datasheet

synchronous step-down switching regulator

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A6985F
Automotive 38 V, 500 mA synchronous step-down switching
regulator with 30 μA quiescent current
Datasheet - production data
HTSSOP16 (RTH = 40 °C/W)
Features
AEC-Q100 qualified
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 0.85 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.
Applications
Designed for automotive systems
Battery powered applications
Car body applications (LCM)
Car audio and low noise applications (LNM)
August 2020
This is information on a product in full production.
DocID027738 Rev 7
1/83
www.st.com


STMicroelectronics Electronic Components Datasheet

A6985F Datasheet

synchronous step-down switching regulator

No Preview Available !

Contents
Contents
A6985F
1
Application schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2
Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.4 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.5 ESD protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4
Datasheet parameters over the temperature range . . . . . . . . . . . . . . . 14
5
Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1 Power supply and voltage reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Switchover feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.2 Voltages monitor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
5.3 Soft-start and inhibit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.3.1 Ratiometric startup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.3.2 Output voltage sequencing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.4 Error amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.5 Output voltage line regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.6 Output voltage load regulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.7 High-side switch resistance vs. input voltage . . . . . . . . . . . . . . . . . . . . . . 27
5.8 Light-load operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.8.1 Low noise mode (LNM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.8.2 Low consumption mode (LCM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.8.3 Quiescent current in LCM with switchover . . . . . . . . . . . . . . . . . . . . . . . 34
5.9 Switchover feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.9.1 LCM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.9.2 LNM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.10 Overcurrent protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
OCP and switchover feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
2/83
DocID027738 Rev 7


Part Number A6985F
Description synchronous step-down switching regulator
Maker STMicroelectronics
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A6985F Datasheet PDF






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