LM22670-ADJ

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LM22670, LM22670-Q1

SNVS584P – SEPTEMBER 2008 – REVISED NOVEMBER 2014

LM22670/-Q1 42 V, 3 A SIMPLE SWITCHER®, Step-Down Voltage Regulator

with Features

1 Features

3 Description

The LM22670 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

•

120 m

Ω N-channel MOSFET PFM Package

capable of providing up to 3 A of load current.

•

100 m

Ω N-channel MOSFET SO PowerPAD-8

Excellent line and load regulation along with high

Package

efficiency (> 90%) are featured. Voltage mode control

•

Output Voltage Options:

offers short minimum on-time, allowing the widest

-ADJ (Outputs as Low as 1.285 V)

ratio between input and output voltages. Internal loop

-5.0 (Output Fixed to 5 V)

compensation means that the user is free from the

tedious task of calculating the loop compensation

•

±1.5% Feedback Reference Accuracy

components. Fixed 5 V output and adjustable output

•

500 kHz Default Switching Frequency

voltage options are available. The default switching

•

Adjustable Switching Frequency and

frequency is set at 500 kHz allowing for small

Synchronization

external components and good transient response. In

addition, the frequency can be adjusted over a range

•

–40°C to 125°C Operating Junction Temperature

of 200 kHz to 1 MHz with a single external resistor.

Range

The internal oscillator can be synchronized to a

•

Precision Enable Pin

system clock or to the oscillator of another regulator.

•

Integrated Boot-Strap Diode

A precision enable input allows simplification of

regulator control and system power sequencing. In

•

Integrated Soft-Start

shutdown mode the regulator draws only 25 µA (typ).

•

Built in soft-start (500 µs, typ) saves external

•

LM22670-Q1 is an Automotive Grade Product

components. The LM22670 device also has built-in

that is AEC-Q100 Grade 1 Qualified (–40°C to

thermal shutdown, and current limiting to protect

+125°C Operating Junction Temperature)

against accidental overloads.

The

LM22670

device

is

a

member

of

Texas

2 Applications

Instruments'

SIMPLE

family.

The

SIMPLE SWITCHER® concept provides for an easy

•

Industrial Control

to use complete design using a minimum number of

•

Telecom and Datacom Systems

external components and the TI WEBENCH® design

•

Embedded Systems

tool. TI's WEBENCH® tool includes features such as

•

Conversions from Standard 24 V, 12 V and 5 V

external component calculation, electrical simulation,

thermal simulation, and build-It boards for easy

Input Rails

design-in.

Simplified Application Schematic

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

HSOP (8)

4.89 mm 3.90 mm

LM22670

LM22670-Q1

TO-263 (7)

10.16 mm x 9.85 mm

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

the end of the data sheet.

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.