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LM3102, LM3102-Q1

SNVS515H – SEPTEMBER 2007 – REVISED JUNE 2015

Step-Down Voltage Regulator

1 Features

•

Storage Systems

•

Broadband Infrastructure

1

•

LM3102-Q1 is an Automotive-Grade Product that

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

•

Direct Conversion from 2-, 3-, and 4-Cell Lithium

Operating Junction Temperature)

Batteries Systems

•

Low Component Count and Small Solution Size

3 Description

•

Stable With Ceramic and Other Low-ESR

The

LM3102/-Q1

SIMPLE

Capacitors

Synchronously Rectified Buck Converter features all

•

No Loop Compensation Required

required functions to implement a highly efficient and

•

High Efficiency at a Light Load by DCM Operation

cost-effective buck regulator. The device can supply

2.5 A to loads with an output voltage as low as 0.8 V.

•

Prebias Start-Up

Dual N-channel synchronous MOSFET switches

•

Ultra-Fast Transient Response

allow

a

low

component

count,

thus

reducing

•

Programmable Soft-Start

complexity and minimizing board size.

•

Programmable Switching Frequency up to 1 MHz

Different from most other COT regulators, the

•

Valley Current Limit

LM3102/-Q1 does not rely on output capacitor ESR

for stability, and is designed to work exceptionally

•

Output Overvoltage Protection

well with ceramic and other very low-ESR output

•

Precision Internal Reference for an Adjustable

capacitors.

The

device

requires

no

loop

Output Voltage Down to 0.8 V

compensation,

results

in

a

fast

load

transient

•

Thermal Shutdown

response and simple circuit implementation. The

operating frequency remains nearly constant with line

•

Key Specifications

variations due to the inverse relationship between the

–

Input Voltage Range 4.5 V to 42 V

input

voltage

and

the

ON-time.

The

operating

–

2.5-A Output Current

frequency can be externally programmed up to

–

0.8 V, ±1.5% Reference

lockout

(UVLO),

output

overvoltage

protection,

–

Integrated Dual N-Channel Main and

thermal

shutdown,

and

gate

drive

UVLO.

The

Synchronous MOSFETs

LM3102/-Q1 is available in the thermally enhanced

–

Thermally Enhanced HTSSOP-20 Package

HTSSOP-20 package, and LM3102 is also available

in a DSBGA low-profile chip-scale package with

2 Applications

reduced output current.

•

5-VDC, 12-VDC, 24-VDC, 12-VAC, and 24-VAC

Device Information(1)

Systems

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

Embedded Systems and Industrial Control

LM3102

DSBGA (28)

3.645 mm × 2.45 mm

•

Automotive Telematics and Body Electronics

LM3102

HTSSOP (20)

6.50 mm × 4.40 mm

•

Point of Load Regulators

LM3102-Q1

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

the end of the data sheet.

Typical Application Schematic

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.