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
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.
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.
Obsolete Versions
Obsolete Part
Alternate Part or
Supplier
Source
Last Time Buy Date
LM5007MMEP
NONE
NATIONAL SEMICONDUCTOR
16 Nov 2008
MotionFire Development Platform on PowerWise Design TV
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MotionFire Development Platform on PowerWise Design TV Date: 3/25/2009 Length: 0:30:00