Features Thin SOT23-6 package 3.0V to 18V input voltage range 1.25V to 16V output voltage range 750mA output current 550kHz (LM2736Y) and 1.6MHz (LM2736X) switching frequencies 350mΩ NMOS switch 30nA shutdown current 1.25V, 2% internal voltage reference Internal soft-start Current-Mode, PWM operation WEBENCH® ™ online design tool Thermal shutdown Description The LM2736 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 6-pin Thin SOT23 package. It provides all the active functions to provide local DC/DC conversion with fast transient response and accurate regulation in the smallest possible PCB area. With a minimum of external components and online design support through WEBENCH® ™, the LM2736 is easy to use. The ability to drive 750mA loads with an internal 350mΩ NMOS switch using state-of-the-art 0.5µm BiCMOS technology results in the best power density available. The world class control circuitry allows for on-times as low as 13ns, thus supporting exceptionally high frequency conversion over the entire 3V to 18V input operating range down to the minimum output voltage of 1.25V. Switching frequency is internally set to 550kHz (LM2736Y) or 1.6MHz (LM2736X), allowing the use of extremely small surface mount inductors and chip capacitors. Even though the operating frequencies are very high, efficiencies up to 90% are easy to achieve. External shutdown is included, featuring an ultra-low stand-by current of 30nA. The LM2736 utilizes current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce inrush current, pulse-by-pulse current limit, thermal shutdown, and output over-voltage protection. Applications Local Point of Load Regulation Core Power in HDDs Set-Top Boxes Battery Powered Devices USB Powered Devices DSL Modems Notebook Computers

WEBENCH® LM2736X     Min   Max   Range     Vin V    3.00 – 18.00V     Vout V    1.25 – 16.00V     Iout A    ≤ 0.75A     Ambient Temp °C    ≤ 100°C   Footprint BOM Cost Efficiency   What are WEBENCH® tools? Also Recommended LM2734▲ 1A Output Current, Wider Vin Range, Vout Down To 0.8V LM5010▲ 1A Output Current, Up To 80V Vin

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

Parameters / Values	LM2736	LM2734	LM5010
Output Current	750 mA	1000 mA	1000 mA
Input Min Voltage	3 Volt	3 Volt	8 Volt
Input Max Voltage	18 Volt	20 Volt	75 Volt
Output Min	1.25 Volt	0.8 Volt	2.5 Volt
Output Max	16 Volt	18 Volt	70 Volt
Frequency Min	1600, 550 kHz	1600, 550 kHz	50 kHz
Frequency Max	1600, 550 kHz	1600, 550 kHz	1000 kHz
Efficiency (peak)	90 %	90, 94 %	91 %
On/Off Pin	Yes	Yes	Yes
PowerGood / Error Flag	No	No	No
SoftStart	Yes	Yes	Yes
Sync Pin	No	No	No
Inverting	No	No	Yes
Flyback	No	No	No
RegType	Switching Regulator	Switching Regulator	Switching Regulator
Temperature Min	-40 deg C	-40 deg C	-40 deg C
Temperature Max	125 deg C	125 deg C	125 deg C
Adjustable Output	Yes	Yes	Yes
Adj Switch Frequency	No	No	Yes
PWM Mode	Current	Current	Constant on-time
Topology	Buck	Buck	Buck
Special Features	OVP, internal compensation	OVP, internal compensation, 30nA shutdown current, pulse-by-pulse current limit	No compensation required, ultra-fast transient response
Step-Down	Yes	Yes	Yes
Multiple Output Capability	No	No	No
Output Voltage	Undefined Volt	Undefined Volt	Undefined Volt
Output Range	1.25V to 13V	0.8V to 18V	2.5V to 70V
Switching Frequency	1600, 550 kHz	1600, 550 kHz	1000 kHz
Feedback Voltage	Undefined Volt	Undefined Volt	2.5 Volt
Regulator Family	Undefined	Undefined	Undefined
Synchronous Rectification	No	No	No

Datasheets

Title		Size	Date	Other Language
	LM2736 Thin SOT23 750mA Load Step-Down DC-DC Regulator	478 Kbytes	19-Sep-11	日本語

Application Notes

Title		Size	Date	Other Language
	AN-1418: Application Note 1418 LM2736 Evaluation Board	858 Kbytes	26-Oct-05	中文

Other Technical Documents

Title		Type	Date
	Thermopiles Raise Heat on Gas Detection	External Article	2008-06-12
	Power Management Considerations for FPGAs and ASICs	Power Designer	2007-03-22

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM2736XMK/NOPB LM2736XMK RoHS Status	TSOT	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 35766 AVNET-EM Worldwide 1000 DIGI-KEY Worldwide 11213 FARNELL Europe and Asia 1000 MOUSER Worldwide 685 NEWARK Americas 648 RSL MICRO Asia Pacific 1000 TAYLOR Americas 35766	$1.30 each at 1K+ pcs	reel of 1000
LM2736XMKX/NOPB LM2736XMKX RoHS Status	TSOT	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 3000 DIGI-KEY Worldwide 0	$1.30 each at 1K+ pcs	reel of 3000
LM2736YMK/NOPB LM2736YMK RoHS Status	TSOT	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1900 AVNET-EM Worldwide 3000 CEAC Asia Pacific 1000 DIGI-KEY Worldwide 3546 FARNELL Europe and Asia 1399 MOUSER Worldwide 1478 NEWARK Americas 1153 RS COMPONENTS Worldwide 2515 TAYLOR Americas 3350	$1.05 each at 1K+ pcs	reel of 1000
LM2736YMKX/NOPB LM2736YMKX RoHS Status	TSOT	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.05 each at 1K+ pcs	reel of 3000

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 LM2736.

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 LM2736 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM2736X EVAL/NOPB	Thin SOT23 750mA Load Step-Down DC-DC Regulator	Full production Lead Free (RoHS)	Distributor Region Qty DIGI-KEY Worldwide 0	$54.50 each	1
Description: LM2736X Thin SOT23 750mA Load Step-Down DC-DC Regulator Features: Thin SOT23-6 packages 3.0V to 18V input voltage range 1.25V to 16V outpout voltage range 750mA output current 550kHz (LM2736Y) and 1.6 MHz (LM2736X) switching frequencies 350mΩ NMOS switch 1.25V, 2% internal voltage reference Internal soft-start Current-Mode, PWM operation WEBENCH® online design tool Thermal shutdown Applications: Local Point of Load Regulation Core Power in HDDs Set-top Boxes Battery Powered Devices USB Powered Devices DSL Modems Notebook Computers Contents: A fully assembled LM2736X evaluation board LM2736 datasheet LM2736 eval board appnote

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM2736Y EVAL/NOPB	Thin SOT23 750mA Load Step-Down DC-DC Regulator	Full production Lead Free (RoHS)	Distributor Region Qty DIGI-KEY Worldwide 0	$54.50 each	1
Description: LM2736Y Thin SOT23 750mA Load Step-Down DC-DC Regulator Features: Thin SOT23-6 packages 3.0V to 18V input voltage range 1.25V to 16V outpout voltage range 750mA output current 550kHz (LM2736Y) and 1.6 MHz (LM2736X) switching frequencies 350mΩ NMOS switch 1.25V, 2% internal voltage reference Internal soft-start Current-Mode, PWM operation WEBENCH® online design tool Thermal shutdown Applications: Local Point of Load Regulation Core Power in HDDs Set-top Boxes Battery Powered Devices USB Powered Devices DSL Modems Notebook Computers Contents: A fully assembled LM2736Y evaluation board LM2736 datasheet LM2736 eval 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
LM2736XMK/NOPB LM2736XMK	13.726 13.851	TSOT	6	1 1	260 260	Detail	Download	N/A	SHAB XTT
LM2736XMKX/NOPB LM2736XMKX	13.726 13.851	TSOT	6	1 1	260 260	Detail	Download	N/A	SHAB XTT
LM2736YMK/NOPB LM2736YMK	13.726 13.851	TSOT	6	1 1	260 260	Detail	Download	N/A	SHBB XTT
LM2736YMKX/NOPB LM2736YMKX	13.726 13.851	TSOT	6	1 1	260 260	Detail	Download	N/A	SHBB XTT

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 LM2736.

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 LM2736 is located at RoHS Status.

Reference Design

RD-136 - LM5020 Reference Design - Dual Output Flyback Converter with isolated outputs of 5V@0.2A and 12V@2.1A. Two LM2736Y's provide an additional output of 3.3V@0.5A and 5V@0.5A

CAD Symbols and Models Download LM2736 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM2736XMK	PVIP050	0	14280	0	0	1755000	3	497986041
LM2736XMKX	PVIP050	0	14280	0	0	1755000	3	497986041
LM2736YMK	PVIP050	0	14280	0	0	1755000	3	497986041
LM2736YMKX	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 LM2736.

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 LM2736 is located at RoHS Status.