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LM25007MMX 数据表(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
部件名 LM25007MMX
功能描述  42V, 0.5A Step-Down Switching Regulator
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LM25007MMX 数据表(HTML) 1 Page - National Semiconductor (TI)

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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 con-
stant operating frequency over load and input voltage varia-
tions. 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 imple-
mented in the LM25007 with forced off time that is inversely
proportional to Vout thus ensuring recovery from fault con-
ditions. 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 internal regulator. Additional features in-
clude: thermal shutdown, Vcc under-voltage lockout, gate
drive under-voltage lockout, and max duty cycle limiter.
Features
n
Integrated 0.74 ohm N-Channel MOSFET switch
n
Guaranteed 0.5Amp output current
n
Ultra-Fast Transient Response
n
Up to 800kHz operation
n
No control loop compensation required
n
Vin feed forward provides constant operating frequency
n
2% accurate 2.5V feedback from -40˚C to 125˚C
n
Highly efficient operation
n
Intelligent current limit protection
n
External shutdown control
n
Thermal shutdown
n
MSOP-8 and thermally enhanced LLP packages
Typical Applications
n
12VDC and 24VDC distributed rail systems
n
24VAC systems
n
Automotive body electronics and telematics
n
Industrial systems
n
HB-LED constant current source
Package
n
MSOP - 8
n
LLP - 8 (4mm x 4mm)
Basic Step-Down Regulator
20165513
February 2006
© 2006 National Semiconductor Corporation
DS201655
www.national.com


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