LM22679-ADJ

VIN

SS

SW

BOOT

FB

GND

VIN

VOUT

IADJ

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LM22679, LM22679-Q1

SNVS581L – FEBRUARY 2013 – REVISED NOVEMBER 2014

With Features

1 Features

3 Description

The LM22679 switching regulator provides all of the

1

•

Wide Input Voltage Range: 4.5 V to 42 V

functions necessary to implement an efficient high-

•

Internally Compensated Voltage Mode Control

voltage step-down (buck) regulator using a minimum

•

Stable With Low ESR Ceramic Capacitors

of external components. This easy-to-use regulator

incorporates a 42-V N-channel MOSFET switch that

•

100-m

Ω N-Channel MOSFET

can provide up to 5 A of load current. Excellent line

•

Output Voltage Options:

and load regulation along with high efficiency (> 90%)

-ADJ (Outputs as Low as 1.285 V)

are featured. Voltage mode control offers short

-5.0 (Output Fixed to 5 V)

minimum on-time, allowing the widest ratio between

•

±1.5% Feedback Reference Accuracy

input and output voltages. Internal loop compensation

means that the user is free from the tedious task of

•

Switching Frequency of 500 kHz

calculating the loop compensation components. Fixed

•

–40°C to 125°C Operating Junction Temperature

5-V output and adjustable output voltage options are

Range

available. A switching frequency of 500 kHz allows for

•

Adjustable Soft-Start

small

external

components

and

good

transient

response. An adjustable soft-start feature is provided

•

Adjustable Current Limit

through the selection of a single external capacitor. In

•

Integrated Boot-Strap Diode

addition, the switch-current limit can be programmed

•

with a single external resistor, allowing solution

optimization. The LM22679 device also has built-in

•

LM22679-Q1 is AEC-Q100 Qualified and

thermal shutdown and current limiting to protect

Manufactured on an Automotive-Grade Flow

against accidental overloads.

•

PFM (Exposed Pad) Package

SIMPLE

family.

The

SIMPLE

SWITCHER concept provides for an easy to use

2 Applications

complete design using a minimum number of external

•

Industrial Control

components and the TI WEBENCH design tool. TI's

•

Telecom and Datacom Systems

WEBENCH tool includes features such as external

component calculation, electrical simulation, thermal

•

Embedded Systems

simulation, and Build-It boards for easy design-in.

•

Conversions from Standard 24-V, 12-V and 5-V

Input Rails

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM22679

TO-263 (7)

10.16 mm x 9.85 mm

LM22679-Q1

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

the end of the data sheet.

Simplified Application Schematic

1

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.