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L6986ITR 数据表(PDF) 3 Page - STMicroelectronics

部件名 L6986ITR
功能描述  38 V, 5 W synchronous iso-buck converter for isolated applications
PDF  60 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L6986ITR 数据表(HTML) 3 Page - STMicroelectronics

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2
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
FSW
MLF
COMP
DELAY
VBIAS
VIN
LX
LX
PGND
PGND
SGND
FB
EXPOSED
PAD TO
SGND+PGND
Table 1. Pin description
Number
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
primary 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
The pin features master / slave synchronization. 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
Connect this pin to ground either directly or through a pull-down resistor if the
RST threshold should be adjusted (see Table 7).
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 open collector after the output voltage is over the reset
threshold. If this pin is left floating, RST is like a Power Good.
9
FB
Primary output voltage sensing
10
SGND
Signal GND
11
PGND
Power GND
12
PGND
Power GND
13
LX
Switching node
14
LX
Switching node
15
VIN
DC input voltage
16
VBIAS
Typically connected to the regulated primary output voltage, if it does not
exceed 6 V. Otherwise connect it to GND.
-
Exposed pad
Exposed pad must be connected to SGND, PGND
L6986I
Pin connection
DS13647 - Rev 1
page 3/60



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