LM25007 42V, 0.5A Step-Down Switching Regulator
February 5, 2008
LM25007
42V, 0.5A Step-Down Switching Regulator
General Description
The LM25007 is a monolithic step-down switching regulator
featuring all of the functions needed to implement a low cost,
efficient, power supply. Capable of driving a 0.5Amp load over
a 9V-42V input voltage range, this device is easy to apply and
is provided in the small MSOP-8 and the thermally enhanced
LLP-8 packages. Ultra-fast transient response is achieved
through the use of a constant on-time architecture with Vin
feed forward. This feature provides an almost constant oper-
ating frequency over load and input voltage variations. The
operating frequency can be adjusted with a single resistor.
This architecture is easy to use and tolerant of component
selection. An intelligent current limit is implemented in the
LM25007 with forced off time that is inversely proportional to
Vout thus ensuring recovery from fault conditions. The output
voltage may be set from 2.5V to >30V. To improve efficiency
in light load applications, the Vcc pin can be connected to an
external voltage source to eliminate the drop through the in-
ternal regulator. Additional features include: thermal shut-
down, Vcc under-voltage lockout, gate drive under-voltage
lockout, and max duty cycle limiter.
Features
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Integrated 0.74 ohm N-Channel MOSFET switch
Guaranteed 0.5Amp output current
Ultra-Fast Transient Response
Up to 800kHz operation
No control loop compensation required
Vin feed forward provides constant operating frequency
2% accurate 2.5V feedback from -40擄C to 125擄C
Highly efficient operation
Intelligent current limit protection
External shutdown control
Thermal shutdown
MSOP-8 and thermally enhanced LLP packages
Typical Applications
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12VDC and 24VDC distributed rail systems
24VAC systems
Automotive body electronics and telematics
Industrial systems
HB-LED constant current source
Package
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MSOP - 8
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LLP - 8 (4mm x 4mm)
Basic Step-Down Regulator
20165513
漏 2008 National Semiconductor Corporation
201655
www.national.com
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