1 Features

1• Low Component Count and Small Solution Size

• Stable With Ceramic and Other Low-ESR

Capacitors

• No Loop Compensation Required

• High Efficiency at a Light Load by DCM Operation

• Prebias Start-Up

• Ultra-Fast Transient Response

• Programmable Soft-Start

• Programmable Switching Frequency up to 1 MHz

• Valley Current Limit

• Output Overvoltage Protection

• Precision Internal Reference for an Adjustable

Output Voltage Down to 0.8 V

• Thermal Shutdown

• Key Specifications

– Input Voltage Range 4.5 V to 42 V

– 2.5-A Output Current

– 0.8 V, ±1.5% Reference

– Integrated Dual N-Channel Main and

Synchronous MOSFETs

– Thermally Enhanced HTSSOP-20 Package

2 Applications

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

Systems

• Embedded Systems and Industrial Control

• Automotive Telematics and Body Electronics

• Point of Load Regulators

• Storage Systems

• Broadband Infrastructure

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

Batteries Systems

3 Description

The LM3102 Synchronously Rectified Buck Converter

features all required functions to implement a highly

efficient and cost-effective buck regulator. The device

can supply 2.5 A to loads with an output voltage as

low as 0.8 V. Dual N-channel synchronous MOSFET

switches allow a low component count, thus reducing

complexity and minimizing board size.

Different from most other COT regulators, the

LM3102 does not rely on output capacitor ESR for

stability, and is designed to work exceptionally well

with ceramic and other very low-ESR output

capacitors. The device requires no loop

compensation, results in a fast load transient

response and simple circuit implementation. The

operating frequency remains nearly constant with line

variations due to the inverse relationship between the

input voltage and the ON-time. The operating

frequency can be externally programmed up to

1 MHz. Protection features include VCC undervoltage

lockout (UVLO), output overvoltage protection,

thermal shutdown, and gate drive UVLO. The

LM3102 is available in the thermally enhanced

HTSSOP-20 package, and LM3102 is also available

in a DSBGA low-profile chip-scale package with

reduced output current.