LM25005 - 42V, 2.5A Step-Down Switching Regulator

Datasheet Packaging Samples & Pricing Eval. Boards Design Tools Application Notes Knowledge Base

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

General 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. More...


  Typical Application
*click for larger image


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


Typical Performance

*click for larger image


  WEBENCH Live Simulation!
LM25005 WEBENCH® Custom
Design/Analyze/Build It/Test It
 
7.00 <=		 V in Lower
V		  
<=		 V in Upper
V		  
<= 42.00
V out 1.23 <= V <= 42.00
I out   A <= 2.50
Ambient Temperature °C <= 100

What are WEBENCH® tools?


Also Recommended
LM5005High Voltage 2.5 A Buck Regulator

Additional Resources

Online Seminars Design Tools (see below)

Application Notes (see below)


Block Diagram

*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM25005 42V, 2.5A Step-Down Switching Regulator 417 Kbytes 20-Mar-07 View Online
Download
LM25005 42V, 2.5A Step-Down Switching Regulator (Japanese)
 592 Kbytes   Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM25005EVALEvaluation Board for LM25005, 42V, 2.5A Step-Down Switching RegulatorFull productionN/A
 
Buy Now 		1+$39.001-
8 weeksN/A
LM25005MHTSSOP EXP PAD20NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$2.20rail
of
73		NSUZXYTT
LM25005
MH
8 weeks2000
LM25005MHXTSSOP EXP PAD20NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$2.20reel
of
2500		NSUZXYTT
LM25005
MH
6 weeks5000

General 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.

Design Tools

TitleSize in Kbytes Date Click link below to Download    
Current Mode Modeling - Reference Guide 1372 Kbytes 1-Aug-2007 View Online Download  
Understanding and Applying Current-Mode Control Theory 427 Kbytes 8-Jan-2008 View Online Download  

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Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1749: Application Note 1749 LM25005 Evaluation Board 158 Kbytes 7-Nov-07 Download
AN-1889: Application Note 1889 How to Measure the Loop Transfer Function of Power Supplies 612 Kbytes 14-Oct-08 Download

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More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1311: Application Note 1311 MPL PHY Layer Overview 151 Kbytes 19-Jan-04 Download
AN-1311 (Chinese): Application Note 1311 MPL PHY Layer Overview
 369 Kbytes  
AN-1453: Application Note 1453 LM25007 Evaluation Board 637 Kbytes 15-Mar-06 Download
AN-1453 (Japanese): Application Note 1453 LM25007 Evaluation Board
 290 Kbytes   Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 7-Jan-2009]