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LM22670MR-ADJ 数据表(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 LM22670MR-ADJ
功能描述  3A SIMPLE SWITCHER짰, Step-Down Voltage Regulator with Synchronization or Adjustable Switching Frequency
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LM22670MR-ADJ 数据表(HTML) 4 Page - National Semiconductor (TI)

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Pin Descriptions
Pin Numbers
PSOP-8
Package
Pin Numbers
TO-263 THIN
Package
Name
Description
Application Information
1
3
BOOT
Bootstrap input
Provides the gate voltage for the high side NFET.
2
-
NC
Not Connected
Pin is not electrically connected inside the chip. Pin
does function as thermal conductor.
3
5
RT/
SYNC
Oscillator frequency adjust pin or
frequency synchronization
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.
4
6
FB
Feedback pin
Inverting input to the internal voltage error amplifier.
5
7
EN
Precision enable pin
When pulled low regulator turns off.
6
4
GND
System ground
Provide good capacitive decoupling between VIN and
this pin.
7
2
VIN
Source input voltage
Input to the regulator. Operates from 4.5V to 42V.
8
1
SW
Switch pin
Attaches to the switch node.
www.national.com
4


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