LM5007 High Voltage (80V) Step Down Switching Regulator
February 5, 2008
LM5007
High Voltage (80V) Step Down Switching Regulator
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 V
IN
. 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 provid-
ing very fast load transient response. An intelligent current
limit is implemented in the LM5007 with forced off time that is
inversely proportional to V
OUT
. 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.
Features
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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
Typical Applications
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Non-Isolated Buck Regulator
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Secondary High Voltage Post Regulator
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+42V Automotive Systems
Package
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MSOP - 8
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LLP - 8 (4mm x 4mm)
Connection Diagram
20078302
8-Lead MSOP, LLP
Ordering Information
Order Number
LM5007MM
LM5007MMX
LM5007SD
LM5007SDX
Package Type
MSOP-8
MSOP-8
LLP-8
LLP-8
NSC Package Drawing
MUA08A
MUA08A
SDC08A
SDC08A
Supplied As
1000 Units on Tape and Reel
3500 Units on Tape and Reel
1000 Units on Tape and Reel
4500 Units on Tape and Reel
漏 2008 National Semiconductor Corporation
200783
www.national.com
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Evaluation Board
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