LM2574N-5.0/NOPB National Semiconductor, LM2574N-5.0/NOPB Datasheet

LM2574N-5.0/NOPB

Manufacturer Part Number

LM2574N-5.0/NOPB

Description

IC REG SIMPLE SWITCHER 8-DIP

Manufacturer

National Semiconductor

Series

SIMPLE SWITCHER®r

Type

Step-Down (Buck)r

Datasheets

1.LM2574MX-ADJNOPB.pdf (24 pages)

2.LM2574N-5.0NOPB.pdf (6 pages)

Specifications of LM2574N-5.0/NOPB

Internal Switch(s)

Yes

Synchronous Rectifier

Number Of Outputs

Voltage - Output

Current - Output

500mA

Frequency - Switching

52kHz

Voltage - Input

4 ~ 40 V

Operating Temperature

-40°C ~ 125°C

Mounting Type

Through Hole

Package / Case

8-DIP (0.300", 7.62mm)

Power - Output

750mW

Current, Input Bias

50 nA

Current, Output

0.5 A

Current, Supply

5 mA

Frequency, Oscillator

52 kHz

Package Type

MDIP-8

Regulator Type

Buck (Step-Down)

Temperature, Operating, Range

-40 to +125 °C

Voltage, Input

40 V

Voltage, Output

5 V

Primary Input Voltage

12V

No. Of Outputs

Output Voltage

Output Current

500mA

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

Other names

*LM2574N-5.0
*LM2574N-5.0/NOPB
LM2574N-5.0

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

LM2574N-5.0/NOPB

Manufacturer:

NIEC

Quantity:

3 000

Company:

Allchip Electronic(HK) Limited

Part Number:

LM2574N-5.0/NOPB

Manufacturer:

Quantity:

4 364

Current page: 1 of 6
Download datasheet (137Kb)

LM2574/LM2574HV

SIMPLE SWITCHER

General Description

The LM2574 series of regulators are monolithic integrated

circuits that provide all the active functions for a step-down

(buck) switching regulator, capable of driving a 0.5A load

with excellent line and load regulation. These devices are

available in fixed output voltages of 3.3V, 5V, 12V, 15V, and

an adjustable output version.

Requiring a minimum number of external components, these

regulators are simple to use and include internal frequency

compensation and a fixed-frequency oscillator.

The LM2574 series offers a high-efficiency replacement for

popular three-terminal linear regulators. Because of its high

efficiency, the copper traces on the printed circuit board are

normally the only heat sinking needed.

A standard series of inductors optimized for use with the

LM2574 are available from several different manufacturers.

This feature greatly simplifies the design of switch-mode

power supplies.

Other features include a guaranteed

put voltage within specified input voltages and output load

conditions, and

shutdown is included, featuring 50 µA (typical) standby cur-

rent. The output switch includes cycle-by-cycle current limit-

ing, as well as thermal shutdown for full protection under

fault conditions.

Typical Application

Note: Pin numbers are for 8-pin DIP package.

Patent Pending

SIMPLE SWITCHER

™

is a trademark of National Semiconductor Corporation

10% on the oscillator frequency. External

(Fixed Output Voltage Versions)

4% tolerance on out-

DS011394

™

0.5A Step-Down Voltage Regulator

Features

n 3.3V, 5V, 12V, 15V, and adjustable output versions

n Adjustable version output voltage range, 1.23V to 37V

n Guaranteed 0.5A output current

n Wide input voltage range, 40V, up to 60V for HV version

n Requires only 4 external components

n 52 kHz fixed frequency internal oscillator

n TTL shutdown capability, low power standby mode

n High efficiency

n Uses readily available standard inductors

n Thermal shutdown and current limit protection

Applications

n Simple high-efficiency step-down (buck) regulator

n Efficient pre-regulator for linear regulators

n On-card switching regulators

n Positive to negative converter (Buck-Boost)

(57V for HV version)

conditions

4% max over line and load

DS011394-1

Related parts for LM2574N-5.0/NOPB

LM2574N-5.0/NOPB Summary of contents

Page 1

... Typical Application (Fixed Output Voltage Versions) Note: Pin numbers are for 8-pin DIP package. Patent Pending SIMPLE SWITCHER ™ trademark of National Semiconductor Corporation © 1999 National Semiconductor Corporation DS011394 0.5A Step-Down Voltage Regulator ™ Features n 3.3V, 5V, 12V, 15V, and adjustable output versions n Adjustable version output voltage range, 1 ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Maximum Supply Voltage LM2574 LM2574HV ON /OFF Pin Input Voltage Output Voltage to Ground (Steady State) Minimum ESD Rating (C = 100 pF 1 Storage Temperature Range LM2574-3 ...

Page 3

LM2574-ADJ, LM2574HV-ADJ Electrical Characteristics Specifications with standard type face are for T ture Range. Unless otherwise specified, V Symbol Parameter SYSTEM PARAMETERS (Note 3) Test Circuit Figure 2 V Feedback Voltage LM2574 V Programmed for 5V. ...

Page 4

All Output Voltage Versions Electrical Characteristics Specifications with standard type face are for T ture Range. Unless otherwise specified 30V for the 15V version. I and V IN LOAD Symbol Parameter ON /OFF CONTROL Test Circuit Figure 2 ...

Page 5

Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM2574M-3.3, LM2574HVM-3.3, LM2574M-5.0, LM2574HVM-5.0, LM2574M-12, LM2574HVM-12, LM2574M-15, LM2574HVM-15, LM2574M-ADJ or LM2574HVM-ADJ 14-Lead Wide Surface Mount (WM) NS Package Number M14B 23 ...

Page 6

... Order Number LM2574M-3.3, LM2574HVM-3.3, LM2574HVN-5.0, LM2574HVN-12, LM2574HVN-15, LM2574HVN-ADJ, LM2574N-5.0, LM2574N-12, LM2574N-15 or LM2574N-ADJ LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION ...

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