+

+

+

BST

RON

RTN

SW

VCC

FB

VIN

VOUT

L1

UVLO

LM5019

7.5V-100V

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LM5019

SNVS788F – JANUARY 2012 – REVISED DECEMBER 2014

LM5019 100-V, 100-mA Constant On-Time Synchronous Buck Regulator

1 Features

3 Description

The LM5019 is a 100-V, 100-mA synchronous step-

1

•

Wide 7.5-V to 100-V Input Range

down regulator with integrated high-side and low-side

•

Integrated 100-mA High-Side and Low-Side

MOSFETs.

The

constant-on-time

(COT)

control

Switches

scheme employed in the LM5019 requires no loop

•

No Schottky Required

compensation, provides excellent transient response,

and enables very low step-down ratios. The on-time

•

Constant On-Time Control

varies inversely with the input voltage resulting in

•

No Loop Compensation Required

nearly constant frequency over the input voltage

•

Ultra-Fast Transient Response

range. A high-voltage startup regulator provides bias

power for internal operation of the IC and for

•

Nearly Constant Operating Frequency

integrated gate drivers.

•

Intelligent Peak Current Limit

A peak current limit circuit protects against overload

•

Adjustable Output Voltage from 1.225 V

conditions. The undervoltage lockout (UVLO) circuit

•

Precision 2% Feedback Reference

allows

the

input

undervoltage

threshold

and

•

Frequency Adjustable to 1 MHz

hysteresis to be independently programmed. Other

protection features include thermal shutdown and

•

Adjustable Undervoltage Lockout

bias supply undervoltage lockout.

•

Remote Shutdown

The LM5019 device is available in WSON-8 and SO

•

Thermal Shutdown

PowerPAD-8 plastic packages.

•

Packages:

–

8-Pin WSON

Device Information(1)

–

8-Pin SO PowerPAD

PART NUMBER

PACKAGE

BODY SIZE (NOM)

SO PowerPAD (8)

4.89 mm x 3.90 mm

LM5019

2 Applications

WSON (8)

4.00 mm x 4.00 mm

•

Smart Power Meters

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

the end of the data sheet.

•

Telecommunication Systems

•

Automotive Electronics

•

Isolated Bias Supply

Typical Application

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.