Connection Diagram

30076840

8-Lead Plastic PSOP-8 Package

NS Package Number MRA08B

Ordering Information

Output Voltage

Order Number

Package Type

NSC Package Drawing

Features

ADJ

LM22671MR-ADJ

PSOP-8 Exposed Pad

MRA08B

ADJ

LM22671MRE-ADJ

ADJ

LM22671MRX-ADJ

5.0

LM22671MR-5.0

5.0

LM22671MRE-5.0

5.0

LM22671MRX-5.0

ADJ

LM22671QMR-ADJ

PSOP-8 Exposed Pad

MRA08B

AEC-Q100 Grade 1 qualified.

Automotive Grade Production

Flow*

ADJ

LM22671QMRE-ADJ

ADJ

LM22671QMRX-ADJ

5.0

LM22671QMR-5.0

5.0

LM22671QMRE-5.0

5.0

LM22671QMRX-5.0

*Automotive Grade (Q) product incorporates enhanced manufacturing and support processes for the automotive market, including defect detection methodologies.

Reliability qualification is compliant with the requirements and temperature grades defined in the AEC-Q100 standard. Automotive grade products are identified

with the letter Q. For more information go to http://www.national.com/automotive.

Pin Descriptions

Pin

Name

Description

Application Information

1

BOOT

Bootstrap input

Provides the gate voltage for the high side NFET.

2

SS

Soft-start pin

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.

3

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

FB

Feedback pin

Inverting input to the internal voltage error amplifier.

5

EN

Precision enable pin

When pulled low regulator turns off.

6

GND

System ground

Provide good capacitive decoupling between VIN and this pin.

7

VIN

Source input voltage

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

8

SW

Switch pin

Attaches to the switch node.

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