LM2674N-5.0/NOPB National Semiconductor, LM2674N-5.0/NOPB Datasheet

LM2674N-5.0/NOPB

Manufacturer Part Number

LM2674N-5.0/NOPB

Description

IC REG SIMPLE SWITCHER 8-DIP

Manufacturer

National Semiconductor

Series

SIMPLE SWITCHER®r

Type

Step-Down (Buck)r

Datasheets

1.LM2674LD-3.3NOPB.pdf (26 pages)

2.LM2674N-5.0NOPB.pdf (5 pages)

Specifications of LM2674N-5.0/NOPB

Internal Switch(s)

Yes

Synchronous Rectifier

Number Of Outputs

Voltage - Output

Current - Output

500mA

Frequency - Switching

260kHz

Voltage - Input

6.5 ~ 40 V

Operating Temperature

-40°C ~ 125°C

Mounting Type

Through Hole

Package / Case

8-DIP (0.300", 7.62mm)

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

5 V

Dc To Dc Converter Type

Step Down

Pin Count

Input Voltage

40V

Output Voltage

Switching Freq

275KHz

Output Current

500mA

Efficiency

90%

Output Type

Fixed

Switching Regulator

Yes

Mounting

Through Hole

Input Voltage (min)

Operating Temp Range

-40C to 125C

Operating Temperature Classification

Automotive

Primary Input Voltage

12V

No. Of Outputs

No. Of Pins

Operating Temperature Range

-40Â°C To +125Â°C

Msl

MSL 1 - Unlimited

Input Voltage Primary Max

40V

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

*LM2674N-5.0
*LM2674N-5.0/NOPB
LM2674N-5.0

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LM2674

SIMPLE SWITCHER

500 mA Step-Down Voltage Regulator

General Description

The LM2674 series of regulators are monolithic integrated

circuits built with a LMDMOS process. These regulators

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

switching regulator, capable of driving a 500 mA load current

with excellent 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) and a fixed frequency oscillator.

The LM2674 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 (

per traces on the printed circuit board are the only heat

sinking needed.

A family of standard inductors for use with the LM2674 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

output voltage within specified input voltages and output

load conditions, and

ternal shutdown is included, featuring typically 50 µA

stand-by current. The output switch includes current limiting,

as well as thermal shutdown for full protection under fault

conditions.

Typical Application

SIMPLE SWITCHER

Windows

is a registered trademark of Microsoft Corporation.

is a registered trademark of National Semiconductor Corporation.

10% on the oscillator frequency. Ex-

1.5% tolerance on

90%), the cop-

Power Converter High Efficiency

To simplify the LM2674 buck regulator design procedure,

there exists computer design software, LM267X Made

Simple (version 6.0).

Features

n Efficiency up to 96%

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

n Computer Design Software LM267X Made Simple

n Simple and easy to design with

n Requires only 5 external components

n Uses readily available standard inductors

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

n Adjustable version output voltage range: 1.21V to 37V

n Guaranteed 500mA output load current

n 0.25Ω DMOS Output Switch

n Wide input voltage range: 8V to 40V

n 260 kHz fixed frequency internal oscillator

n TTL shutdown capability, low power standby mode

n Thermal shutdown and current limit protection

Typical Applications

n Simple High Efficiency (

n Efficient Pre-Regulator for Linear Regulators

n Positive-to-Negative Converter

(version 6.0)

conditions

Regulator

1.5% max output voltage tolerance over line and load

10004101

90%) Step-Down (Buck)

Related parts for LM2674N-5.0/NOPB

LM2674N-5.0/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 SIMPLE SWITCHER ® registered trademark of National Semiconductor Corporation. Windows ® registered trademark of Microsoft Corporation. Power Converter High Efficiency ® To simplify the LM2674 buck regulator design procedure, there exists computer design software, LM267X Made Simple (version 6 ...

Page 2

... LM2674M-3.3 2674M-3.3 2674M-3.3 LM2674M-5.0 2674M-5.0 2674M-5.0 2674M-ADJ 2674M-ADJ LM2674N-12 LM2674N-12 LM2674N-3.3 LM2674N-3.3 LM2674N-5.0 LM2674N-5.0 LM2674N-ADJ 2 8-Lead Package Top View 10004102 SO-8/DIP Package Supplied as: 1000 Units on Tape and Reel 4500 Units on Tape and Reel 1000 Units on Tape and Reel 4500 Units on Tape and Reel ...

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

LM2674-ADJ (Continued) Symbol Parameter η Efficiency V = 12V All Output Voltage Versions Specifications with standard type face are for T ture Range. Unless otherwise specified, V sion, and I = 100 mA. LOAD Symbol Parameters DEVICE PARAMETERS ...

Page 5

... Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 8-Lead (0.300" Wide) Molded Dual-In-Line Package Order Number LM2674N-3.3, LM2674N-5.0, LM2674N-12 or LM2674N-ADJ NS Package Number N08E 25 ...

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