4

8

3

6

5

1

2

CVCC

7

LM5007

VCC

FB

SW

BST

VIN

RCL

RTN

RON

RCL

CIN

COUT

Shutdown

RC

VIN

9 V to 75 V

VOUT

CBST

LO

D1

RON

RFB2

RFB1

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Folder

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Now

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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.

LM5007

SNVS252H – SEPTEMBER 2003 – REVISED NOVEMBER 2018

LM5007 75-V, 0.5-A DC/DC Buck Converter With 80-V Integrated Power MOSFET

1

1 Features

1

•

Versatile Synchronous Buck DC/DC Converter

–

Operating Input Voltage Range of 9 V to 75 V

–

Integrated 80-V, 0.7-A N-Channel Buck Switch

–

Internal High-Voltage VCC Regulator

–

Adjustable Output Voltage

–

High Efficiency Operation

•

Adaptive Constant On-Time Control Architecture

–

Ultra-Fast Transient Response

–

No Control Loop Compensation Required

•

Nearly Constant Switching Frequency

–

PWM On-Time Varies Inversely with Input

Voltage

•

Precision 2.5-V Reference

•

Low Input Quiescent Current

•

Inherent Protection Features for Robust Design

–

Intelligent Current Limit Protection

–

VCC and Gate Drive UVLO Protection

–

Thermal Shutdown Protection With Hysteresis

–

External Shutdown Control

•

8-Pin VSSOP and WSON Packages

•

Create a Custom Regulator Design Using

WEBENCH® Power Designer

2 Applications

•

Non-Isolated DC/DC Buck Regulator

•

Secondary High-Voltage Post Regulator

•

48-V Automotive Systems

3 Description

The LM5007 0.5-A step-down switching converter

features all of the functions needed to implement a

low-cost and efficient buck regulator. This high-

voltage converter has an integrated 80-V, 0.7-A N-

channel buck switch and operates over an input

voltage range of 9 V to 75 V. The device is easy to

implement and is provided in 8-pin VSSOP and

thermally enhanced 8-pin WSON packages.

The converter uses a hysteretic control scheme with

a PWM on-time inversely proportional to VIN. This

feature allows the operating frequency to remain

relatively constant with load and input voltage

variations. The hysteretic control requires no loop

compensation and provides fast transient response.

An intelligent current limit is implemented with forced

off-time that is inversely proportional to VOUT. This

current

limiting

scheme

ensures

short-circuit

protection

while

providing

reduced

load

current

foldback. Other protection features include thermal

shutdown with automatic recovery, VCC and gate

drive undervoltage lockout, and maximum duty cycle

limiter.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM5007

VSSOP (8)

3.00 mm × 3.00 mm

WSON (8)

4.00 mm × 4.00 mm

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

the end of the data sheet.

Typical Application Schematic