LM22670 datasheet(4/20 Pages) NSC

Part #	LM22670

Description	3A SIMPLE SWITCHER짰, Step-Down Voltage Regulator with Synchronization or Adjustable Switching Frequency

PDF	20 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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4 / 20 page

Pin Descriptions

Pin Numbers

PSOP-8

Package

Pin Numbers

TO-263 THIN

Package

Name

Description

Application Information

BOOT

Bootstrap input

Provides the gate voltage for the high side NFET.

Not Connected

Pin is not electrically connected inside the chip. Pin

does function as thermal conductor.

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.

Feedback pin

Inverting input to the internal voltage error amplifier.

Precision enable pin

When pulled low regulator turns off.

GND

System ground

Provide good capacitive decoupling between VIN and

this pin.

VIN

Source input voltage

Input to the regulator. Operates from 4.5V to 42V.

Switch pin

Attaches to the switch node.

LM22670 Datasheet(PDF) 4 Page - National Semiconductor (TI)