1 Features

1• AEC-Q100-Qualified for Automotive Applications:

– Temperature grade 1: –40°C to +125°C, TA

• 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 20-Pin HTSSOP Package

• Create a Custom Design using the LM3102-Q1

with the WEBENCH® Power Designer

2 Applications

• Automotive Body Electronics

• Automotive Lighting

• Automotive Infotainment and Telematics

• General 12-V and 24-V Automotive DC/DC

Conversion

3 Description

The LM3102-Q1 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-Q1 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-Q1 is available in the thermally enhanced

20-pin HTSSOP package.