LM3100 - Synchronous 1MHz 1.5A Step-Down Voltage Regulator

LM3100 - Synchronous 1MHz 1.5A Step-Down Voltage Regulator from the PowerWise® Family

Datasheet	Packaging	Samples & Pricing	Eval. Boards	Design Tools	Application Notes	Knowledge Base

Features

•	Input voltage range 4.5V - 36V
•	1.5A output current
•	0.8V, ±1.5% reference
•	Integrated 40V, dual N-Channel buck synchronous switches
•	Low component count and small solution size
•	No loop compensation required
•	Ultra-fast transient response
•	Stable with ceramic and other low ESR capacitors
•	Programmable switching frequency up to 1MHz
•	Max. duty cycle limited during start-up
•	Valley current limit
•	Precision Internal Reference for adjustable output voltage down to 0.8V
•	Thermal shutdown
•	Thermally enhanced eTSSOP-20 package

General Description

Typical Application

click for larger image

Parameters Values

Output Current 1500 mA

Input Min Voltage 4.5 Volt

Input Max Voltage 36 Volt

Output Min 0.8 Volt

Output Max 7 Volt

Frequency Min Undefined kHz

Frequency Max 1000 kHz

Efficiency (peak) 86 %

On/Off Pin Yes

Error Flag No

SoftStart Yes

Sync Pin No

Inverting No

Flyback No

RegType Switching Regulator

Temperature Min -40 deg C

Temperature Max 125 deg C

Adjustable Output Yes

Adj Switch Frequency Yes

PWM Mode Constant on-time

Topology Synchronous Buck

Special Features Vin feed forward and Current Injection compensation, SIMPLE SWITCHER synchronous regulator

Step-Down Yes

Multiple Output Capability No

Output Power Undefined Watt

Output Voltage Undefined Volt

Output Range 0.8V to 7V

Switching Frequency 1000 kHz

Feedback Voltage Undefined Volt

Regulator Family SIMPLE SWITCHER

Automotive Yes

PowerWise Yes

Synchronous Rectification Yes

Typical Performance

*click for larger image

WEBENCH Live Simulation!

LM3100
4.50 <=	V in Lower V	<=	V in Upper V	<= 36.00
V out	0.80 <=		V	<= 7.00
I out			A	<= 1.50
Ambient Temperature			°C	<= 100
What are WEBENCH® tools?

Also Recommended

LM20242▲	36V, 2A PowerWise Step_Down Synchronous Switching Regulator
LM2592HV▲	60V 2A Non-Synchronous Buck Regulator
LM3102▲	Synchronous 1MHz 2.5A
LM3103▲	Synchronous 1MHz 0.75A
LM5005▲	75V 2.5A Buck Regulator

Additional Resources

Online Seminars

PCB Layout Considerations for Switchers

Design Tools

Application Notes

Block Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM3100 SIMPLE SWITCHER® Synchronous 1MHz 1.5A Step-Down Voltage Regulator	3481 Kbytes	3-Aug-07	Download
LM3100 SIMPLE SWITCHER® Synchronous 1MHz 1.5A Step-Down Voltage Regulator (Japanese)	918 Kbytes

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Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Weeks

Qty

$US each

LM3100EVAL

SIMPLE SWITCHER®™ Synchronous 1MHz 1.5A Step-Down Voltage Regulator

Full production

N/A

$77.00

8 weeks

N/A

LM3100MH

TSSOP EXP PAD

NOPB

260

RoHS

Download

Full production

N/A

1K+

$2.35

rail
of
73

NSUZXYTT
LM3100
MH

12 weeks

1000

LM3100MHX

TSSOP EXP PAD

NOPB

260

RoHS

Download

Full production

N/A

1K+

$2.35

reel
of
2500

NSUZXYTT
LM3100
MH

6 weeks

5000

General Description

The LM3100 Synchronously Rectified Buck Converter features all functions needed to implement a highly efficient, cost effective buck regulator capable of supplying 1.5A to loads with voltages as low as 0.8V. Dual 40V N-Channel synchronous MOSFET switches allow for low external component thus reducing complexity and minimizing board space. The LM3100 is designed to work exceptionally well with ceramic and other very low ESR output capacitors. The Constant ON-Time (COT) regulation scheme requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. Through the use of a unique design the regulator does not rely on output capacitor ESR for stability, as do most other COT regulators. The operating frequency remains nearly constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The oprating frequency can be externally programmed up to 1MHz. Protection features include V_CC under-voltage lockout, thermal shutdown and gate drive under-voltage lockout. The part is available in a thermally enhanced eTSSOP-20 package

Design Tools

Title	Size in Kbytes	Date
Article - Emulated Ripple Technique Advances Hysteretic Switchmode Supplies			View
Article - Tip of the Week: How to best implement a synchronous buck converter			View
Article - Emulated ripple makes step-down conversion easy			View

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Application Notes

Title	Size in Kbytes	Date
AN-1443: Application Note 1443 LM3100 Demonstration Board Reference Design	3704 Kbytes	11-Mar-07	Download
AN-1443 (Chinese): Application Note 1443 LM3100 Demonstration Board Reference Design	444 Kbytes
AN-1481: Application Note 1481 Controlling Output Ripple and Achieving ESR Independence in Constant On-Time (COT) Regulator Designs	574 Kbytes	27-Sep-06	Download
AN-1481 (Japanese): Application Note 1481 Controlling Output Ripple and Achieving ESR Independence in Constant On-Time (COT) Regulator Designs	220 Kbytes
AN-1481 (Chinese): Application Note 1481 Controlling Output Ripple and Achieving ESR Independence in Constant On-Time (COT) Regulator Designs	421 Kbytes

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More Application Notes

Title	Size in Kbytes	Date
AN-1646: Application Note 1646 LM3102 Demonstration Board Reference Design	216 Kbytes	2-Oct-07	Download
AN-1646 (Chinese): Application Note 1646 LM3102 Demonstration Board Reference Design	411 Kbytes
AN-1678: Application Note 1678 LM3103 Demonstration Board Reference Design	217 Kbytes	2-Oct-07	Download

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[Information as of 7-Nov-2009]