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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LM2598

SNVS125D – MARCH 1998 – REVISED MAY 2016

With Features

1

1 Features

1

•

3.3-V, 5-V, 12-V, and Adjustable Output Versions

•

Adjustable Version Output Voltage Range, 1.2-V

to 37-V ±4% Max Over Line and Load Conditions

•

1-A Output Current

•

Available in 7-Pin TO-220 and DDPAK (Surface

Mount) Package

•

Input Voltage Range Up to 40 V

•

Excellent Line and Load Regulation Specifications

•

150 kHz Fixed Frequency Internal Oscillator

•

Shutdown/Soft-start

•

Out of Regulation Error Flag

•

Error Output Delay

•

•

High Efficiency

•

Uses Readily Available Standard Inductors

•

Thermal Shutdown and Current Limit Protection

2 Applications

•

Simple High-Efficiency Step-down (Buck)

Regulator

•

Efficient Preregulator for Linear Regulators

•

On-Card Switching Regulators

•

Positive to Negative Converter

3 Description

The LM2598 series of regulators are monolithic

integrated circuits that provide all the active functions

for a step-down (buck) switching regulator, capable of

driving a 1-A load with excellent line and load

regulation. These devices are available in fixed output

voltages of 3.3 V, 5 V, 12 V, and an adjustable output

version.

The LM2598 is a member of the LM259x family.

Requiring

a

minimum

number

of

external

components, these regulators are simple to use and

include internal frequency compensation, improved

line and load specifications, fixed-frequency oscillator,

Shutdown/Soft-start, error flag delay and error flag

output.

The LM2598 series operates at a switching frequency

of

150

kHz,

thus

allowing

smaller

sized

filter

components than what would be required with lower-

frequency

switching

regulators.

Available

in

a

standard

7-lead

TO-220

package

with

several

different lead bend options, and a 7-lead DDPAK

surface mount package. Typically, for output voltages

less than 12 V, and ambient temperatures less than

50°C, no heat sink is required.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM2598

TO-220 (7)

14.986 mm × 10.16 mm

TO-263 (7)

10.10 mm × 8.89 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

Typical Application

Fixed output voltage versions