lm22673mrx-adj National Semiconductor Corporation, lm22673mrx-adj Datasheet - Page 3

• Manufacturer Part Number: lm22673mrx-adj
• Description: 3a Simple Switcher , Step-down Voltage Regulator With Adjustable Soft-start And Current Limit
• Manufacturer: National Semiconductor Corporation

Pin Numbers
Pin Descriptions
Package
PSOP-8
1
2
3
4
5
6
7
8
Pin Numbers
TO-263 THIN
Package
3
5
6
7
4
2
1
-
BOOT
Name
IADJ
GND
VIN
SW
NC
SS
FB
Description
Bootstrap input
Not Connected
Current limit setting pin
Feedback pin
Soft-Start pin
System ground
Source input voltage
Switch pin
3
Application Information
Provides the gate voltage for the high side NFET.
Pin is not electrically connected inside the chip. Pin
does function as thermal conductor.
A resistor attached between this pin and GND can be
used to set the current limit threshold. Pin can be left
floating and internal setting will be default.
Inverting input to the internal voltage error amplifier.
An external capacitor and an internal 50 µA current
source set the time constant for the rise of the error
amplifier reference. Pin can be left floating and internal
soft-start will be default.
Provide good capacitive decoupling between VIN and
this pin.
Input to the regulator. Operates from 4.5V to 42V.
Attaches to the switch node.
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