VIN

SW

BST

LM25010

VCC

SS

RON/SD

6V - 42V

Input

C1

RON

R2

R1

C2

VOUT

L1

C3

C4

D1

C6

RTN

ISEN

SGND

FB

SHUTDOWN

R3

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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.

LM25010, LM25010-Q1

SNVS419E – DECEMBER 2005 – REVISED MAY 2016

LM25010, LM25010-Q1 42-V, 1-A Step-Down Switching Regulator

1

1 Features

1

•

LM25010-Q1 Qualified for Automotive

Applications

•

AEC-Q100 Qualified With the Following Results:

–

Device Temperature Grade 1: –40°C to 125°C

Ambient Operating Temperature Range

–

Device Temperature Grade 0: –40°C to 150°C

Ambient Operating Temperature Range

–

Device HBM ESD Classification Level 2

–

Device CDM ESD Classification Level C5

•

Wide 6-V to 42-V Input Voltage Range

•

Valley Current Limiting at 1.25 A

•

Programmable Switching Frequency Up To 1 MHz

•

Integrated N-Channel Buck Switch

•

Integrated High Voltage Bias Regulator

•

No Loop Compensation Required

•

Ultra-Fast Transient Response

•

Nearly Constant Operating Frequency With Line

and Load Variations

•

Adjustable Output Voltage

•

2.5 V, ±2% Feedback Reference

•

Programmable Soft Start

•

Thermal Shutdown

2 Applications

•

Non-Isolated Telecommunications Regulators

•

Secondary Side Post Regulators

•

Automotive Electronics

3 Description

The LM25010 features all the functions needed to

implement

a

low-cost,

efficient,

buck

regulator

capable of supplying in excess of 1-A load current.

This high voltage regulator integrates an N-Channel

Buck Switch, and is available in thermally enhanced

10-pin WSON and 14-pin HTSSOP packages. The

constant ON-time regulation scheme requires no loop

compensation

resulting

in

fast

load

transient

response and simplified circuit implementation. The

operating frequency remains constant with line and

load

variations

due

to

the

inverse

relationship

between the input voltage and the ON-time. The

valley current limit detection is set at 1.25 A.

Additional

features

include:

VCC

undervoltage

lockout, thermal shutdown, gate drive undervoltage

lockout, and maximum duty cycle limiter.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM25010x

WSON (10)

4.00 mm × 4.00 mm

HTSSOP (14)

4.40 mm × 5.00 mm

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

the end of the data sheet.

Basic Step-Down Regulator