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 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 VCC under-voltage lockout, thermal shutdown and gate drive under-voltage lockout. The part is available in a thermally enhanced eTSSOP-20 package

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 MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance *click for larger image

Datasheets

Title		Size	Date	Other Language
	LM3100 SIMPLE SWITCHER® Synchronous 1MHz 1.5A Step-Down Voltage Regulator	3502 Kbytes	1-Dec-09	日本語

Featured Application Notes

Title		Size	Date	Other Language
	AN-1443: Application Note 1443 LM3100 Demonstration Board Reference Design	3704 Kbytes	11-Mar-07	中文
	AN-1481: Application Note 1481 Controlling Output Ripple and Achieving ESR Independence in Constant On-Time (COT) Regulator Designs	574 Kbytes	27-Sep-06	日本語 中文

More Application Notes

Title		Size	Date	Other Language
	AN-1646: Application Note 1646 LM3102 Demonstration Board Reference Design	216 Kbytes	2-Oct-07	中文
	AN-1678: Application Note 1678 LM3103 Demonstration Board Reference Design	217 Kbytes	2-Oct-07

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LM3100MH/NOPB LM3100MH RoHS Status	TSSOP EXP PAD	Full production Lead Time: 16 weeks	Distributor Region Qty AVNET-EM Worldwide 10 DIGIKEY Worldwide 144 FARNELL Europe and Asia 204 FUTURE Worldwide 1100 NEWARK Americas 357 RS COMPONENTS Worldwide 94	$2.35 each at 1K+ pcs	rail of 73
LM3100MHX/NOPB LM3100MHX RoHS Status	TSSOP EXP PAD	Full production Lead Time: 18 weeks	Distributor Region Qty DIGIKEY Worldwide 0 FUTURE Worldwide 58	$2.35 each at 1K+ pcs	reel of 2500

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A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Part Number(s) (NSID)	Top View	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM3100MH/NOPB LM3100MH		TSSOP EXP PAD	20	1 1	260 260	Detail	Download	N/A	NSUZXYTT LM3100 MH
LM3100MHX/NOPB LM3100MHX		TSSOP EXP PAD	20	1 1	260 260	Detail	Download	N/A	NSUZXYTT LM3100 MH

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.

Design Tools

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

CAD Symbols and Models Download LM3100 CAD Symbols

Models N/A

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?

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3100MH	ABCD150	0	34175	0	0	4234000	1	1201409060
LM3100MHX	ABCD150	0	34175	0	0	4234000	1	1201409060

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/packaging/leadfree.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/quality/green.

National's certificate of product compliance is located at RoHS Status.