FB

SW

L1

LM25011

BST

D1

CS

RT

VIN

6V to 42V

Input

SS

SGND

PGD

CSG

Power

Good

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LM25011, LM25011-Q1, LM25011A, LM25011A-Q1

SNVS617H – APRIL 2009 – REVISED NOVEMBER 2014

LM25011, LM25011-Q1, LM25011A, LM25011A-Q1 42-V 2-A Constant On-Time Switching

Regulator With Adjustable Current Limit

1 Features

3 Description

The LM25011 constant on-time step-down switching

1

•

LM25011-Q1 is an Automotive Grade Product that

regulator

features

all

the

functions

needed

to

is AEC-Q100 Grade 1 Qualified (–40°C to +125°C

implement a low-cost, efficient, buck bias regulator

Operating Junction Temperature)

capable of supplying up to 2 A of load current. This

•

LM25011A Allows Low-Dropout Operation at High

high-voltage regulator contains an N-Channel Buck

Switching Frequency

switch, a startup regulator, current limit detection, and

internal

ripple

control.

The

constant

on-time

•

Input Operating Voltage Range: 6 V to 42 V

regulation principle requires no loop compensation,

•

Absolute Maximum Input Rating: 45 V

results in fast load transient response, and simplifies

•

Integrated 2-A N-Channel Buck Switch

circuit

implementation.

The

operating

frequency

•

Adjustable Current Limit Allows for Smaller

remains constant with line and load. The adjustable

valley current limit detection results in a smooth

Inductor

transition from constant voltage to constant current

•

Adjustable Output Voltage from 2.51 V

mode when current limit is reached, without the use

•

of current limit foldback. The PGD output indicates

•

Power Good Output

the output voltage has increased to within 5% of the

expected

regulation

value.

Additional

features

•

Switching Frequency Adjustable to 2 MHz

include: Low output ripple, VIN under-voltage lock-

•

COT Topology Features:

out, adjustable soft-start timing, thermal shutdown,

–

Switching Frequency Remains Nearly

gate drive pre-charge, gate drive under-voltage lock-

Constant with Load Current and Input Voltage

out, and maximum duty cycle limit.

Variations

The LM25011A has a shorter minimum off-time than

–

Ultra-Fast Transient Response

the LM25011, which allows for higher frequency

operation at low input voltages.

–

No Loop Compensation Required

–

Stable Operation with Ceramic Output

Device Information(1)

Capacitors

PART NUMBER

PACKAGE

BODY SIZE (NOM)

–

Allows for Smaller Output Capacitor and

LM25011 / -Q1

Current Sense Resistor

HVSSOP (10)

3.00 mm × 3.00 mm

LM25011A / -Q1

•

Adjustable Soft-Start Timing

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

•

Thermal Shutdown

the end of the data sheet.

•

Precision 2% Feedback Reference

Typical Application

•

Package: 10-Pin, HVSSOP

2 Applications

•

Automotive Safety

•

Infotainment

•

Telecommunication

•

Front Camera

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.