LM2671M-ADJ/NOPB National Semiconductor, LM2671M-ADJ/NOPB Datasheet

LM2671M-ADJ/NOPB

Manufacturer Part Number

LM2671M-ADJ/NOPB

Description

IC REG SIMPLE SWITCHER 8-SOIC

Manufacturer

National Semiconductor

Series

SIMPLE SWITCHER®r

Type

Step-Down (Buck)r

Datasheets

1.LM2671LD-ADJNOPB.pdf (24 pages)

2.LM2671M-ADJNOPB.pdf (5 pages)

Specifications of LM2671M-ADJ/NOPB

Internal Switch(s)

Yes

Synchronous Rectifier

Number Of Outputs

Voltage - Output

1.21 ~ 37 V

Current - Output

500mA

Frequency - Switching

260kHz

Voltage - Input

6.5 ~ 40 V

Operating Temperature

-40°C ~ 125°C

Mounting Type

Surface Mount

Package / Case

8-SOIC (3.9mm Width)

Current, Input Bias

85 nA

Current, Output

500 mA

Current, Supply

2.5 mA

Frequency, Oscillator

260 kHz

Package Type

SOIC

Regulator Type

Buck (Step-Down)

Temperature, Operating, Range

-40 to +125 °C

Voltage, Input

8 to 40 V

Voltage, Output

1.21 to 37 V

Primary Input Voltage

40V

No. Of Outputs

Output Voltage

37V

Output Current

500mA

No. Of Pins

Operating Temperature Range

-40Â°C To +125Â°C

Msl

MSL 1 - Unlimited

Filter Terminals

SMD

Rohs Compliant

Yes

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Power - Output

Lead Free Status / Rohs Status

RoHS Compliant part Electrostatic Device

Other names

*LM2671M-ADJ
*LM2671M-ADJ/NOPB
LM2671M-ADJ

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LM2671

SIMPLE SWITCHER

500mA Step-Down Voltage Regulator with Features

General Description

The LM2671 series of regulators are monolithic integrated

circuits built with a LMDMOS process. These regulators pro-

vide all the active functions for a step-down (buck) switching

regulator, capable of driving a 500mA load current with ex-

cellent line and load regulation. These devices are available

in fixed output voltages of 3.3V, 5.0V, 12V, and an adjustable

output version.

Requiring a minimum number of external components, these

regulators are simple to use and include patented internal

frequency compensation (Patent Nos. 5,382,918 and

5,514,947), fixed frequency oscillator, external shutdown,

soft-start, and frequency synchronization.

The LM2671 series operates at a switching frequency of

260 kHz, thus allowing smaller sized filter components than

what would be needed with lower frequency switching regu-

lators. Because of its very high efficiency (>90%), the copper

traces on the printed circuit board are the only heat sinking

needed.

A family of standard inductors for use with the LM2671 are

available from several different manufacturers. This feature

greatly simplifies the design of switch-mode power supplies

using these advanced ICs. Also included in the datasheet are

selector guides for diodes and capacitors designed to work in

switch-mode power supplies.

Other features include a guaranteed ±1.5% tolerance on out-

put voltage within specified input voltages and output load

conditions, and ±10% on the oscillator frequency. External

shutdown is included, featuring typically 50 μA stand-by cur-

rent. The output switch includes current limiting, as well as

thermal shutdown for full protection under fault conditions.

Typical Application

(Fixed Output Voltage Versions)

SIMPLE SWITCHER

Windows

is a registered trademark of Microsoft Corporation.

is a registered trademark of National Semiconductor Corporation

Power Converter High Efficiency

To simplify the LM2671 buck regulator design procedure,

there exists computer design software, LM267X Made Sim-

ple (version 6.0).

Features

■

Applications

■

Efficiency up to 96%

Available in SO-8, 8-pin DIP and LLP packages

Computer Design Software LM267X Made Simple

(version 6.0)

Simple and easy to design with

Requires only 5 external components

Uses readily available standard inductors

3.3V, 5.0V, 12V, and adjustable output versions

Adjustable version output voltage range: 1.21V to 37V

±1.5% max output voltage tolerance over line and load

conditions

Guaranteed 500mA output load current

0.25Ω DMOS Output Switch

Wide input voltage range: 8V to 40V

260 kHz fixed frequency internal oscillator

TTL shutdown capability, low power standby mode

Soft-start and frequency synchronization

Thermal shutdown and current limit protection

Simple High Efficiency (>90%) Step-Down (Buck)

Regulator

Efficient Pre-Regulator for Linear Regulators

10004201

Related parts for LM2671M-ADJ/NOPB

LM2671M-ADJ/NOPB Summary of contents

Page 1

... The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions. Typical Application (Fixed Output Voltage Versions) SIMPLE SWITCHER ® registered trademark of National Semiconductor Corporation Windows ® registered trademark of Microsoft Corporation. ® Power Converter High Efficiency ...

Page 2

... LM2671LDX-3.3 S0006B LM2671LD-5.0 S0007B LM2671LDX-5.0 S0007B LM2671LD-ADJ S0008B S0008B LM2671M-12 2671M-12 LM2671MX-12 2671M-12 LM2671M-3.3 2671M-3.3 LM2671MX-3.3 2671M-3.3 LM2671M-5.0 2671M-5.0 LM2671MX-5.0 2671M-5.0 LM2671M-ADJ 2671M-ADJ LM2671MX-ADJ 2671M-ADJ LM2671N-12 LM2671N-12 LM2671N-3.3 LM2671N-3.3 LM2671N-5.0 LM2671N-5.0 LM2671N-ADJ LM2671N-ADJ 2 8-Lead Package Top View 10004202 SO-8/DIP Package Supplied as: ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ON/OFF Pin Voltage Switch Voltage to Ground Boost Pin Voltage Feedback Pin Voltage ESD Susceptibility Human Body Model (Note 2) Power Dissipation ...

Page 4

Symbol Parameter V Feedback Voltage V = 6.5V to 40V Programmed for 5V OUT (see Circuit of Figure 3) η Efficiency V = 12V All Output Voltage Versions Specifications with standard type face are ...

Page 5

... Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead (0.150 Wide) Molded Small Outline Package, JEDEC Order Number LM2671M-3.3, LM2671M-5.0, LM2671M-12 or LM2671M-ADJ NS Package Number M08A 22 ...

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