LM5007_08 Datasheet, PDF (1/12 Pages) National Semiconductor (TI) – 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
■ ^{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
■ ^{Non-Isolated Buck Regulator}
■ ^{Secondary High Voltage Post Regulator}
■ ^{+42V Automotive Systems}
Package
■ ^{MSOP - 8}
■ ^{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
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