Features Integrated 42V, 160mΩ N-channel MOSFET Ultra-wide input voltage range from 7V to 42V Internal bias regulator Adjustable output voltage from 1.225V 1.5% feedback reference accuracy Current mode control with emulated inductor current ramp Single resistor oscillator frequency setting Oscillator synchronization input Programmable soft-start Shutdown / Standby input Wide bandwidth error amplifier Thermal Shutdown Description The LM25005 switching regulator features all of the functions necessary to implement an efficient, high voltage buck regulator using a minimum of external components. This easy to use regulator includes a 42V, 160mΩ, N-channel MOSFET, with an output current capability of 2.5 Amps. The regulator control method is based upon current mode control utilizing an emulated current ramp. Current mode control provides inherent line voltage feed-forward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The operating frequency is programmable from 50kHz to 500kHz. An oscillator synchronization pin allows multiple LM25005 regulators to self-synchronize or to be synchronized to an external clock. Additional protection features include: current limit, thermal shutdown and remote shutdown capability. The device is available in a power enhanced TSSOP-20 package featuring an exposed die attach pad to aid thermal dissipation.

WEBENCH® LM25005     Min   Max   Range     VIN – V    7.00 – 42.00V     VOUT V    1.23 – 30.00V     IOUT A    ≤ 2.50A     Ambient Temp °C    ≤ 100°C   Footprint BOM Cost Efficiency What are WEBENCH® tools? Also Recommended LM5005▲ High Voltage 2.5 A Buck Regulator

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

Parameters / Values	LM25005	LM5005
Output Current	2500 mA	2500 mA
Input Min Voltage	7 Volt	7 Volt
Input Max Voltage	42 Volt	75 Volt
Output Min	1.23 Volt	1.23 Volt
Output Max	37 Volt	70 Volt
Frequency Min	50 kHz	50 kHz
Frequency Max	500 kHz	500 kHz
Efficiency (peak)	94 %	94 %
On/Off Pin	Yes	Yes
PowerGood / Error Flag	No	No
SoftStart	Yes	Yes
Sync Pin	Yes	Yes
Inverting	Yes	Yes
Flyback	No	No
RegType	Switching Regulator	Switching Regulator
Temperature Min	-40 deg C	-40 deg C
Temperature Max	125 deg C	125 deg C
Adjustable Output	Yes	Yes
Adj Switch Frequency	Yes	Yes
PWM Mode	Current	Current
Topology	Buck, Inverting	Buck
Special Features	1.5% feedback voltage accuracy, emulated current mode	1.5% feedback voltage accuracy, emulated current mode
Step-Down	Yes	Yes
Multiple Output Capability	No	No
Output Range	1.23V to 37V	1.23V to 70V
Switching Frequency	500 kHz	500 kHz
Feedback Voltage	1.225 Volt	Undefined Volt
Automotive	Yes	Yes
Synchronous Rectification	No	No

Datasheets

Title		Size	Date	Other Language
	LM25005 42V, 2.5A Step-Down Switching Regulator	417 Kbytes	20-Mar-07	日本語

Application Notes

Title		Size	Date	Other Language
	AN-1749: Application Note 1749 LM25005 Evaluation Board	158 Kbytes	7-Nov-07
	AN-1889: Application Note 1889 How to Measure the Loop Transfer Function of Power Supplies	612 Kbytes	14-Oct-08

Other Technical Documents

Title		Type	Date
	Buck Regulator Topologies for Wide Input/Output Voltage Differentials	Power Designer	2007-03-28

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM25005MH/NOPB LM25005MH RoHS Status	TSSOP EXP PAD	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 1584 DIGI-KEY Worldwide 1612 FARNELL Europe and Asia 250 MOUSER Worldwide 219 NEWARK Americas 104 RS COMPONENTS Worldwide 14 TAYLOR Americas 1584	$1.60 each at 1K+ pcs	rail of 73
LM25005MHX/NOPB LM25005MHX RoHS Status	TSSOP EXP PAD	Full production Lead Time: 8 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.60 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 LM25005.

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 LM25005 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM25005EVAL	Evaluation Board for LM25005, 42V, 2.5A Step-Down Switching Regulator	Full production	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 1	$39.00 each	1
Description: LM25005 High Voltage 2.5Amp Buck Regulator Features: Integrated 42V, 160mΩ N-channel MOSFET Ultra-wide input voltage range from 7V to 42V Internal bias regulator Adjustable output voltage from 1.225V 1.5% feedback reference accuracy Current mode control with emulated inductor current ramp Single resistor oscillator frequency setting Programmable soft-start Shutdown/Standby input Wide bandwidth error amplifier Thermal Shutdown Contents: A fully assembled LM25005 evaluation board LM25005 datasheet (includes 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
LM25005MH/NOPB LM25005MH	73.06 73.592	TSSOP EXP PAD	20	1 1	260 260	Detail	Download	N/A	NSUZXYTT LM25005 MH
LM25005MHX/NOPB LM25005MHX	73.061 73.592	TSSOP EXP PAD	20	1 1	260 260	Detail	Download	N/A	NSUZXYTT LM25005 MH

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 LM25005.

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 LM25005 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 LM25005 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM25005MH	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM25005MHX	ABCD150XV1	0	3868	0	0	2595000	2	736338335

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 LM25005.

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 LM25005 is located at RoHS Status.

Introduction to Emulated Current Mode (ECM) Control and the new SIMPLE SWITCHER® Buck Regulators Click image to play video in new window

Introduction to Emulated Current Mode (ECM) Control and the new SIMPLE SWITCHER® Buck Regulators Date: 2007-01-17 Length: 00:33:00