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

Datasheet

Title		Size	Date	Other Language
	LM3100 SIMPLE SWITCHER® Synchronous 1MHz 1.5A Step-Down Voltage Regulator	3481 Kbytes	3-Aug-07	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

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

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.

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