LM5008 - High Voltage (100V) Step Down Switching Regulator

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

Features
•Integrated 100V, N-Channel buck switch
•Internal VCC regulator
•No loop compensation required
•Ultra-Fast transient response
•On time varies inversely with line voltage
•Operating frequency remains constant with varying line voltage and load current
•Adjustable output voltage
•Highly efficient operation
•Precision internal reference
•Low bias current
•Intelligent current limit protection
•Thermal shutdown

General Description

The LM5008 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, Buck bias regulator. More...


  Typical Application
*click for larger image


Parametric Table     expand
Parametric Table    collapse
Output Current 350 mA
Input Min Voltage 9.5 Volt
Input Max Voltage 95 Volt
Output Min 2.5 Volt
Output Max 75 Volt
Frequency Min 50000 Hz
Frequency Max 600000 Hz
Output Current 350 mA
Input Min Voltage 9.5 Volt
Input Max Voltage 95 Volt
Output Min 2.5 Volt
Output Max 75 Volt
Frequency Min 50000 Hz
Frequency Max 600000 Hz
Efficiency (peak) 92 %
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 100V/0.5A 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 75V
Switching Frequency 600000 Hz
Feedback Voltage Undefined Volt
Regulator Family Undefined
AEC Q-100 Automotive Grade Undefined
Synchronous Rectification No
View Using Catalog


Typical Performance

*click for larger image


  WEBENCH Live Simulation!
LM5008 WEBENCH® Custom
Design/Analyze/Build It/Test It
 
9.50 <=		 V in Lower
V		  
<=		 V in Upper
V		  
<= 95.00
V out 2.50 <= V <= 75.00
I out   A <= 0.40
Ambient Temperature °C <= 100

What are WEBENCH® tools?


Also Recommended
LM50101A 80V Switching Regulator

Additional Resources

Online Seminars Application Notes (see below)


Block Diagram

*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM5008 High Voltage (100V) Step Down Switching Regulator 359 Kbytes 5-Feb-08 View Online
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
LM5008EVALHigh Voltage (100V) Step Down Switching RegulatorFull productionN/A
 
Buy Now 		1+$30.001-
8 weeksN/A
LM5008MMMINI SOIC8STD
NOPB		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.70reel
of
1000		ZXTT
SAYB
6 weeks5000
LM5008MMXMINI SOIC8NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.70reel
of
3500		ZXTT
SAYB
12 weeks7500
LM5008SDCLLP8NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.70reel
of
1000		NS
UZXYTT
L5008SD
6 weeks1000
LM5008SDCXLLP8NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.70reel
of
4500		NS
UZXYTT
L5008SD
8 weeksN/A

General Description

The LM5008 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, Buck bias regulator. This high voltage regulator contains an 100 V N-Channel Buck Switch. The device is easy to implement 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. The hysteretic control requires no loop compensation. An intelligent current limit is implemented with forced OFF time, which is inversely proportional to Vout. This scheme ensures short circuit protection while providing minimum foldback. Other protection features include: Thermal Shutdown, VCC under-voltage lockout, Gate drive under-voltage lockout, and Max Duty Cycle limiter

Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1330: Application Note 1330 LM5008 Evaluation Board 334 Kbytes 7-May-04 Download

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More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1875: Application Note 1875 LM5073HE Evaluation Board With Active Bridge 230 Kbytes 2-Jul-08 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-1820: Application Note 1820 LM5032 Interleaved Boost Converter 1942 Kbytes 30-May-08 Download
AN-1481: Application Note 1481 Controlling Output Ripple and Achieving ESR Independence in Constant On-Time (COT) Regulator Designs 574 Kbytes 27-Sep-06 Download
AN-1481 (Japanese): Application Note 1481 Controlling Output Ripple and Achieving ESR Independence in Constant On-Time (COT) Regulator Designs
 220 Kbytes   Download
AN-1481 (Chinese): Application Note 1481 Controlling Output Ripple and Achieving ESR Independence in Constant On-Time (COT) Regulator Designs
 421 Kbytes  
AN-1445: Application Note 1445 LM5009 Evaluation Board 479 Kbytes 23-Jul-08 Download
AN-1588: Application Note 1588 LM5001 Evaluation Board 658 Kbytes 18-Mar-07 Download
AN-1748: Application Note 1748 LM5005 Evaluation Board 159 Kbytes 7-Nov-07 Download
AN-1574: Application Note 1574 LM5073 Evaluation Board 464 Kbytes 24-Apr-07 Download
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  
AN-1298: Application Note 1298 LM5007 Evaluation Board 313 Kbytes 29-Jan-04 Download
AN-1630: Application Note 1630 LM5001 Non-Isolated Flyback Evaluation Board 240 Kbytes 10-Dec-07 Download
AN-1736: Application Note 1736 LM3433 HB LED Driver Evaluation Kit 1011 Kbytes 4-Feb-08 Download
AN-1793: Application Note 1793 LM3433 4A to 20A LED Driver Evaluation Board 701 Kbytes 25-Aug-08 Download

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[Information as of 13-Oct-2008]