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A6986 Datasheet

2A synchronous step-down switching regulator

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A6986
38 V, 2 A synchronous step-down switching regulator with 30 µA
quiescent current
Datasheet - production data
HTSSOP16 (RTH = 40 °C/W)
Features
AECQ100 qualification
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)
Output voltage 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
RDSON HS = 180 m, RDSON LS = 150 m
Thermal shutdown
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
voltage range make the A6986 device ideal for
battery powered automotive systems. The “Low
Consumption Mode” (LCM) is designed for
applications active during car parking, so it
maximizes the efficiency at the light-load with the
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 the medium - heavy load, and the
high switching frequency capability makes the
size of the application compact. Pulse-by-pulse
current sensing on both power elements
implements effective constant current protection.
Applications
Designed for automotive systems
Battery powered applications
Car body applications (LCM)
Car audio and low noise applications (LNM)
November 2015
This is information on a product in full production.
DocID026211 Rev 6
1/67
www.st.com


STMicroelectronics Electronic Components Datasheet

A6986 Datasheet

2A synchronous step-down switching regulator

No Preview Available !

Contents
Contents
A6986
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
2/67 DocID026211 Rev 6


Part Number A6986
Description 2A synchronous step-down switching regulator
Maker STMicroelectronics
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A6986 Datasheet PDF






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