=

37,125

I

CL

Voltage

5V/3A

180 PF/16V

33 PH

L

Feedback

Boost

SR305

Ground

Current

Softstart

1 nF

Voltage

8V to 40V

Input

LM2673 - 5.0

Output

Switch

Output

0.01 PF

+

Limit

Adjust

8.2k

0.47 PF

+

+

2 x 15 PF/50V

Copyright © 2016, Texas Instruments Incorporated

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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.

LM2673

SNVS030O – APRIL 2000 – REVISED JUNE 2016

Limit

1

1 Features

1

•

Efficiency Up to 94%

•

Simple and Easy to Design With (Using Off-The-

Shelf External Components)

•

Resistor Programmable Peak Current Limit Over a

Range of 2 A to 5 A

•

150-mΩ DMOS Output Switch

•

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

(1.2 V to 37 V) Versions

•

±2% Maximum Output Tolerance Over Full Line

and Load Conditions

•

Wide Input Voltage Range: 8 V to 40 V

•

260-KHz Fixed Frequency Internal Oscillator

•

Soft-Start Capability

•

–40 to 125°C Operating Junction Temperature

Range

2 Applications

•

Simple-to-Design, High Efficiency (>90%) Step-

Down Switching Regulators

•

Efficient System Preregulator for Linear Voltage

Regulators

•

Battery Chargers

3 Description

The LM2673 series of regulators are monolithic

integrated circuits which provide all of the active

functions for a step-down (buck) switching regulator

capable of driving up to 3-A loads with excellent line

and load regulation characteristics. High efficiency

(>90%) is obtained through the use of a low ON-

resistance DMOS power switch. The series consists

of fixed output voltages of 3.3 V, 5 V, and 12 V and

an adjustable output version.

complete design using a minimum number of external

components.

A

high

fixed

frequency

oscillator

(260 kHz) allows the use of physically smaller sized

components. A family of standard inductors for use

with

the

LM2673

are

available

from

several

manufacturers to greatly simplify the design process.

Other features include the ability to reduce the input

surge current at power on by adding a soft-start

timing capacitor to gradually turn on the regulator.

The

LM2673

series

also

has

built-in

thermal

shutdown and resistor programmable current limit of

the power MOSFET switch to protect the device and

load circuitry under fault conditions. The output

voltage is ensured to a ±2% tolerance. The clock

frequency is controlled to within a ±11% tolerance.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM2673

TO-263 (7)

10.10 mm × 8.89 mm

TO-220 (7)

14.986 mm × 10.16 mm

VSON (14)

6.00 mm × 5.00 mm

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

the end of the data sheet.

Typical Application