Dave QuarlesVice President of International Sales

Linear Technology CorporationIntroducing the LTM®461826V, 6A Step-Down µModule® Regulator

© 2006 Linear Technology

2

Introducing The LTM4618

• The LTM4618 is a 4.5V to 26.5V VIN highly efficient step-down µModule regulator capable of delivering 6A of output current.

• Purpose of this training:• Explain what is a µModule regulator and its

benefits• Provide an in-depth look at the LTM4618

• Main features / functionality and benefits / reliability testing

• Provide instructions for obtaining design support and additional product information

© 2006 Linear Technology

3

What is a µModule Regulator?

A Complex Power Solution Becomes…

Product displayed for demonstration purposes only

Simple Again

© 2006 Linear Technology

4

DC/DC Converter Comparison Table

µModule® Regulator

Linear Regulator

Switching Regulator

Switching Controller

High EfficiencyRegion1 (VOUT vs. VIN) Wide

Narrow(VOUT ≥ 85% of

VIN)Wide Wide

Component Count Low Low Moderate High

Output Power Low to High Low Low to Mid High

Design Effort Low Low Moderate High

PCB Layout Effort Low Low Moderate High

Schematic

1. Defined as supporting 85% efficiency or greater for this comparison

© 2008 Linear Technology

5

LTM4618 Key Features 4.5V to 26.5V input range Up to 6A output current 0.8V to 5V output range

±1.2% VREF Accuracy (-40°C to +125°C) Up to 96% Efficient Externally Adj FSW 250kHz – 780kHz

Synchronizable to external clock Optional Pulse Skip or Burst Mode

Operation for high efficiency at light loads Adjustable soft start 9 x 15 x 4.32mm LGA package

optional

© 2008 Linear Technology

6

LGA Reliability

Combined data for all LTMs in 9 x 15mm LGA Device Hours Failures

High Temperature Bake (+150°C) Operating 1,829,581 0

Life Test (+125°C equivalent) 938,000 0

Device Cycles Failures

Temp Cycle (-65°C to +150°C) 2,713,500 0

Thermal Shock (-65°C to +150°C) 1,773,000 0

Board Mount Temp Cycle (-40°C to +125°C) 548,000 0

© 2008 Linear Technology

7

LTM4618 LTSpice Model

Simple to verify using LTspice simulation software available for free! Pre-built models for

virtually all LinearTechnology productsand many discretecomponents

Detailed application& Design notes available fordownload

© 2008 Linear Technology

8

LTM4618: Summary

For additional information or demo circuits related to the LTM4618 or other µModule® regulator products please visit:http://www.linear.com/micromodule

Full suite of design support resources available for free download: LTspice circuit simulation LTM product application notes LTM product design notes PCB assembly guidelines video Demo Circuit Gerber files

Look for the Quick Start Link!Look for the Quick Start Link!