LM5007 - High Voltage (80V) Step Down Switching Regulator
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Design Tools Reference Designs Application Notes Knowledge Base

Features
•Integrated 80V, 0.7A N-Channel Buck Switch
•Internal HV Vcc Regulator
•No Control Loop Compensation Required
•Ultra-Fast Transient Response
•On Time Varies Inversely with Line Voltage
•Operating Frequency Nearly Constant with Varying Line Voltage
•Adjustable Output Voltage
•Highly Efficient Operation
•Precision Reference
•Low Bias Current
•Intelligent Current Limit Protection
•Thermal Shutdown
•External Shutdown Control

General Description

The LM5007 Step Down Switching Regulator features all of the functions needed to implement low cost, efficient, Buck bias regulators. More...


 

ParametersValues
Output Current 500 mA
Input Min Voltage 9 Volt
Input Max Voltage 75 Volt
Output Min 2.5 Volt
Output Max 73 Volt
Frequency Min 50 kHz
Frequency Max 800 kHz
Efficiency (peak) 93 %
On/Off Pin Yes
Error Flag No
SoftStart No
Sync Pin No
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 Constant on-time
Topology Buck
Special Features Internal startup regulator for Vin>9V, internal 80V/0.7A N-FET, Pull Ron pin to ground for shutdown
Step-Down Yes
Multiple Output Capability No
Output Power Undefined Watt
Output Voltage Undefined Volt
Output Range 2.5V to 73V
Switching Frequency 800 kHz
Feedback Voltage 2.5 Volt
Regulator Family Undefined
Automotive Yes
Synchronous Rectification No


Typical Performance

*click for larger image


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LM5007
 
9.00 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 75.00
V out 2.50 <=  V <= 75.00
I out    A <= 0.50
Ambient Temperature  °C <= 100


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Additional Resources
Online Seminars Design Tools

Application Notes


Block Diagram

*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM5007 High Voltage (80V) Step Down Switching Regulator 281
Kbytes		 5-Feb-08 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
LM5007EVALHigh Voltage (80V) Step Down Switching Regulator Evaluation BoardFull productionN/A
 
Buy Now 		1+$30.001-
8 weeksN/A
LM5007SD-EVALHigh Voltage (80V) Step Down Switching RegulatorFull productionN/A
 
Buy Now 		1+$33.801-
8 weeksN/A
LM5007MMMINI SOIC8NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.81reel
of
1000		ZXTT
S81B
6 weeks7500
LM5007MMXMINI SOIC8NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$1.81reel
of
3500		ZXTT
S81B
6 weeks10000
LM5007SDLLP8NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.81reel
of
1000		NS
UZXYTT
L00031B
6 weeks2000
LM5007SDXLLP8NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.81reel
of
4500		NS
UZXYTT
L00031B
6 weeks5000

Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM5007MMEP
NONE
NATIONAL SEMICONDUCTOR
16 Nov 2008

General Description

The LM5007 Step Down Switching Regulator features all of the functions needed to implement low cost, efficient, Buck bias regulators. This high voltage regulator contains an 80 V, 0.7A N-Channel Buck Switch. The device is easy to apply and is provided in the MSOP-8 and the thermally enhanced LLP-8 packages. The regulator is based on a hysteretic control scheme using an on time inversely proportional to VIN. This feature allows the operating frequency to remain relatively constant with load and input voltage variations. The hysteretic control requires no control loop compensation, while providing very fast load transient response. An intelligent current limit is implemented in the LM5007 with forced off time that is inversely proportional to VOUT. This current limiting scheme reduces load current foldback. Additional protection features include: Thermal Shutdown, Vcc undervoltage lockout, gate drive undervoltage lockout, and Max Duty Cycle limiter.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM5007MMABCD150XV1038680025950002736338335
LM5007MMXABCD150XV1038680025950002736338335
LM5007SDABCD150XV1038680025950002736338335
LM5007SDXABCD150XV1038680025950002736338335

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.


Design Tools

TitleSize in Kbytes Date Click link below to Download    
LM5007 Quick Start Calculator 358 Kbytes 13-Jul-2009 View    
Article - Controller Monitors ORing FET Current and Voltage     View    
Article - Negative Supply Uses Positive Hysteretic Regulator     View    

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Reference Designs
•LM5007 Reference Design - Buck Bias Converter: 18-42V Input, 13V @ 70 mA Output
•LM5007 Reference Design - Buck Converter for Automotive Applications, 1 to 2 High Brightness LUXEON LEDs @ 350 mA

Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1298: Application Note 1298 LM5007 Evaluation Board 313
Kbytes		 29-Jan-04 Download
AN-1319: Application Note 1319 Analysis and Design of a Hysteretic Constant Frequency Buck Regulator Using the LM5007 426
Kbytes		 25-May-04 Download
AN-1319 (Chinese): Application Note 1319 Analysis and Design of a Hysteretic Constant Frequency Buck Regulator Using the LM5007
 484 Kbytes  
AN-1634: Application Note 1634 Starting Up A Buck Regulator With a Voltage Present At V OUT 71
Kbytes		 17-May-07 Download
AN-1634 (Japanese): Application Note 1634 Starting Up A Buck Regulator With a Voltage Present At V OUT
 95 Kbytes   Download
AN-1634 (Chinese): Application Note 1634 Starting Up A Buck Regulator With a Voltage Present At V OUT
 222 Kbytes  

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 220 Kbytes   Download
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 421 Kbytes  
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[Information as of 7-Nov-2009]