Features Input voltage from 2.9V to 18V Output voltage adjustable from 0.6V to 5.5V Feedback Accuracy: ±1% Low-side Sensing, Programmable Current Limit without sense resistor Input Under Voltage Lockout Hiccup mode current limit protection eliminates thermal runaway during fault conditions Internal soft start with tracking capability 200 kHz to 1.5 MHz Switching frequency, Synchronizable On-chip gate drivers Soft output discharge during shutdown Startup into output pre-bias Operation from a single input rail Adaptive Duty Cycle Limit TSSOP-16 package Description The LM3495 is a PWM buck regulator which implements a unique emulated peak current mode control. This control method eliminates the switching noise which typically limits current mode operation at extremely short duty cycles and high operating frequency. The switching frequency is programmable between 200 kHz and 1.5 MHz, and can also be synchronized to an external clock. The LM3495 is also very fault tolerant with both switch node short, hiccup mode, and adaptive duty cycle limit protection. A 0.6V 1% reference and glitch free pre-biased start-up ensure the most demanding digital loads operate reliably. Internal soft start and the ability to track the output of another supply make the LM3495 versatile and efficient. Applications Wide input voltage buck converters with low voltage, high accuracy outputs Core logic regulators High-efficiency buck regulation

Also Recommended LM2642▲ For Dual Output Synchronous Switching Controller LM2657 For Dual Output Switching Controller LM2745▲ 1V-14V Single Output Synchronous NFET Controller LM3485▲ 4.5V - 35V Single Output PFET Driver LM3743▲ 3.0V-6.0V Single Output Synchronous NFET Controller

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

Parameters / Values	LM3495	LM2642	LM2745	LM3485	LM3743
Output Current	10000 mA	20000 mA	20000 mA	4000 mA	10000 mA
Input Min Voltage	2.9 Volt	4.5 Volt	1 Volt	4.5 Volt	3 Volt
Input Max Voltage	18 Volt	30 Volt	17 Volt	35 Volt	5.5 Volt
Feedback Voltage	0.6 Volt	1.238 Volt	0.6 Volt	1.27 Volt	0.8 Volt
Feedback Tolerance	1 %	2 %	1.5 %	2 %	1.75 %
Frequency Min	200 kHz	300 kHz	50 kHz	0 kHz	300 kHz
Frequency Max	1500 kHz	300 kHz	1000 kHz	1400 kHz	1000 kHz
Efficiency (peak)	95 %	Undefined %	85 %	93 %	95 %
Output Range	0.6V to 5.5V	1.238V-27V (each output)	0.6V to 13.5V	1.242V to Vin	0.8V to 4.6V
Adj Switch Frequency	Yes	No	Yes	Yes	No
Adjustable Output	Yes	Yes	Yes	Yes	Yes
On/Off Pin	Yes	Yes	Yes	No	Yes
PowerGood / Error Flag	No	Yes	Yes	No	No
SoftStart	Yes	Yes	Yes	No	Yes
Sync Pin	Yes	No	Yes	No	No
Inverting	No	No	No	No	No
Flyback	No	No	No	No	No
Lossless Current Sense	Yes	Yes	Yes	Yes	Yes
RegType	Switching Controller	Switching Controller	Switching Controller	Switching Controller	Switching Regulator
Temperature Min	-40 deg C	-40 deg C	-40 deg C	-40 deg C	-40 deg C
Temperature Max	125 deg C	125 deg C	125 deg C	125 deg C	125 deg C
Channels	1 Channels	2 Channels	1 Channels	1 Channels	1 Channels
Special Features	Power supply tracking; Pre-bias startup; Skip mode at light load	180deg out-of-phase channels; Individual softstart allows sequencing	Pre-bias startup; 40ns min on-time	No compensation required; Current limit; PFET controller	Pre-bias start-up; Hiccup mode; External programmable soft-start and tracking
Topology	Buck	Buck	Buck	Buck	Buck
PWM Mode	Emulated Peak Current Mode	Current	Voltage	Hysteretic	Voltage
Step-Down	Yes	Yes	Yes	Yes	Yes
Step-Up	No	No	No	No	No
Output Power	Undefined Watt	Undefined Watt	Undefined Watt		Undefined Watt
Output Max	5.5 Volt	27 Volt	13.5 Volt		4.6 Volt
Output Min	0.6 Volt	1.238 Volt	0.6 Volt	1.242 Volt	0.8 Volt
PowerWise	Yes		Yes		Yes

Datasheets

Title		Size	Date	Other Language
	LM3495 Emulated Peak Current Mode Buck Controller for Low Output Voltage	563 Kbytes	28-Nov-07	日本語

Application Notes

Title		Size	Date	Other Language
	AN-1446: Application Note 1446 LM3495 Evaluation Board	1395 Kbytes	3-Mar-06

Other Technical Documents

Title		Type	Date
	Control Method Solves Low Duty-Cycle Dilemmas	External Article	2006-09-01
	Emulated Current Mode Control for Buck Regulators Using Sample and Hold Technique	App Note	2007-03-21

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM3495MTC/NOPB LM3495MTC RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 227 DIGI-KEY Worldwide 286 FARNELL Europe and Asia 655 MOUSER Worldwide 276 RS COMPONENTS Worldwide 13	$1.50 each at 1K+ pcs	rail of 92
LM3495MTCX/NOPB LM3495MTCX RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 2500 DIGI-KEY Worldwide 4 TAYLOR Americas 2500	$1.50 each at 1K+ pcs	reel of 2500

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

Moisture Sensitivity Level Data for LM3495.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM3495 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM3495EVAL/NOPB	Emulated Peak Current Mode Buck Controller for Low Output Voltage	Full production Lead Free (RoHS)	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 1	$90.50 each	1
Features: Input voltage from 2.9V to 18V Output voltage adjustable from 0.6V to 5.5V Feedback Accuracy ±1% Low-side Sensing, Programmable Current Limit without sense resistor Input Under Voltage Lockout Hiccup mode current limit protection eliminates thermal runaway during fault conditions Internal soft start with tracking capability 200 kHz to 1.5 MHz Switching frequency, Synchronizable On-chip gate drivers Soft output discharge during shutdown Startup into output pre-bias Operation from a single input rail Adaptive Duty Cycle Limit TSSOP-16 package Applications: Wide input voltage buck converters with low voltage, high accuracy outputs Core logic regulators High-efficiency buck regulation Contents: A fully assembled LM3495 evaluation board LM3495 datasheet LM3495 evaluation board appnote

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM3495MTC/NOPB LM3495MTC	56.74 57	TSSOP	16	1 1	260 260	Detail	Download	N/A	NSUZXYTT LM3495 MTC
LM3495MTCX/NOPB LM3495MTCX	56.74 57	TSSOP	16	1 1	260 260	Detail	Download	N/A	NSUZXYTT LM3495 MTC

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

Moisture Sensitivity Level Data for LM3495.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM3495 is located at RoHS Status.

Design Tools

Title	Size	Date
Current Mode Modeling - Reference Guide
Understanding and Applying Current-Mode Control Theory

CAD Symbols and Models Download LM3495 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3495MTC	PVIP050	0	14280	0	0	1755000	3	497986041
LM3495MTCX	PVIP050	0	14280	0	0	1755000	3	497986041

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/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM3495.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM3495 is located at RoHS Status.