lm22670tje-adj National Semiconductor Corporation, lm22670tje-adj Datasheet - Page 3

• Manufacturer Part Number: lm22670tje-adj
• Description: 3a Simple Switcher , Step-down Voltage Regulator With Synchronization Or Adjustable Switching Frequency
• 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
SYNC
GND
RT/
VIN
SW
NC
EN
FB
Description
Bootstrap input
Not Connected
Oscillator frequency adjust pin or
frequency synchronization
Feedback pin
Precision enable 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 connected from this pin to GND adjusts the
oscillator frequency. This pin can also accept an input
for synchronization from an external clock. Pin can be
left floating and internal setting will be default to 500
kHz.
Inverting input to the internal voltage error amplifier.
When pulled low regulator turns off.
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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