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A6986H Datasheet(PDF) 3 Page - STMicroelectronics

Part # A6986H
Description  Automotive 38 V, 2 A synchronous step-down switching regulator with 30 μA
PDF  71 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A6986H Datasheet(HTML) 3 Page - STMicroelectronics

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2
Pin settings
2.1
Pin connection
Figure 2. Pin connection (top view)
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
RST
VCC
SS/INH
SYNCH/ISKIP
FSW
MLF
COMP
DELAY
VBIAS
VIN
LX
LX
PGND
PGND
SGND
VOUT
EXPOSED
PAD TO
SGND+PGND
2.2
Pin description
Table 1. Pin description
N°
Pin
Description
1
RST
The RST open collector output is driven low when the output voltage is out of regulation. The
RST is released after an adjustable time DELAY once the output voltage is over the active
delay threshold.
2
VCC
Connect a ceramic capacitor (≥ 470 nF) to filter internal voltage reference. This pin supplies
the embedded analog circuitry.
3
SS/INH
An open collector stage can disable the device clamping this pin to GND (INH mode). An
internal current generator (4 µA typ.) charges the external capacitor to implement the soft-
start.
4
SYNCH/ ISKP
The pin features master / slave synchronization in LNM (see Section 5.8.1 ) and skip current
level selection in LCM (see Section 5.8.2 ). In LNM, leave this pin floating when it is not
used.
5
FSW
A pull-up resistor (E24 series only) to VCC or pull down to GND selects the switching
frequency. Pin strapping is active only before the soft-start phase to minimize the IC
consumption.
6
MLF
A pull-up resistor (E24 series only) to VCC or pull-down to GND selects the low consumption
mode/low noise mode and the active RST threshold. Pin strapping is active only before the
soft-start phase to minimize the IC consumption.
7
COMP
Output of the error amplifier. The designed compensation network is connected at this pin.
8
DELAY
An external capacitor connected to this pin sets the time DELAY to assert the rising edge of
the RST o.c. after the output voltage is over the reset threshold. If this pin is left floating, RST
is like a Power Good.
9
VOUT
Output voltage sensing
10
SGND
Signal GND
11
PGND
Power GND
12
PGND
Power GND
A6986H
Pin settings
DS12861 - Rev 3
page 3/71



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