LM25010 반도체 회로 부품 판매점
Step-Down Switching Regulator
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 National Semiconductor |
February 2006
LM25010
42V, 1.0A Step-Down Switching Regulator
General Description
The LM25010 features all the functions needed to implement
a low cost, efficient, buck regulator capable of supplying in
excess of 1A load current. This high voltage regulator inte-
grates an N-Channel Buck Switch, and is available in ther-
mally enhanced LLP-10 and TSSOP-14EP packages. The
constant on-time regulation scheme requires no loop com-
pensation resulting in fast load transient response and sim-
plified circuit implementation. The operating frequency re-
mains constant with line and load variations due to the
inverse relationship between the input voltage and the on-
time. The valley current limit detection is set at 1.25A. Addi-
tional features include: VCC under-voltage lock-out, thermal
shutdown, gate drive under-voltage lock-out, and maximum
duty cycle limiter.
Features
n Wide 6V to 42V Input Voltage Range
n Valley Current Limiting At 1.25A
n Programmable Switching Frequency Up To 1 MHz
n Integrated N-Channel Buck Switch
n Integrated High Voltage Bias Regulator
n No Loop Compensation Required
n Ultra-Fast Transient Response
n Nearly Constant Operating Frequency With Line and
Load Variations
n Adjustable Output Voltage
n 2.5V, ±2% Feedback Reference
n Programmable Soft-Start
n Thermal shutdown
Typical Applications
n Non-Isolated Telecommunications Regulator
n Secondary Side Post Regulator
n Power SUpply for Automotive Electronics
Package
n LLP-10 (4 mm x 4 mm)
n TSSOP-14EP
n Both Packages Have Exposed Thermal Pad For
Improved Heat Dissipation
Basic Step-Down Regulator
© 2006 National Semiconductor Corporation DS201727
20172743
www.national.com
Connection Diagrams
20172702
Ordering Information
Order Number
LM25010SD
LM25010SDX
LM25010MH
LM25010MHX
Package Type
LLP-10 (4x4)
LLP-10 (4x4)
TSSOP-14EP
TSSOP-14EP
NSC Package
Drawing
SDC10A
SDC10A
MXA14A
MXA14A
20172703
Junction Temperature
Range
−40˚C to + 125˚C
−40˚C to + 125˚C
−40˚C to + 125˚C
−40˚C to + 125˚C
Supplied As
1000 Units on Tape and Reel
4500 Units on Tape and Reel
94 Units in Rail
2500 Units on Tape and Reel
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LM25010 regulator
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