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PDF LM25007 Data sheet ( Hoja de datos )
| Número de pieza | LM25007 | |
| Descripción | Step-Down Switching Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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1. LM25007  Hay una vista previa y un enlace de descarga de LM25007 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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www.DataSheet4U.com
February 2006
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
© 2006 National Semiconductor Corporation DS201655
20165513
www.national.com
1 page  
Electrical Characteristics (Continued)
Specifications with standard type are for TJ = 25˚C only; limits in boldface type apply over the full Operating Junction Tempera-
ture (TJ) range. Minimum and Maximum limits are guaranteed through test, design, or statistical correlation. Typical values rep-
resent the most likely parametric norm at TJ = 25˚C, and are provided for reference purposes only. Unless otherwise stated the
following conditions apply: VIN = 24V, RON = 200kΩ. (Note 3).
Symbol
Parameter
Conditions
Min Typ
Max
Units
Minimum Off Time
Minimum Off Timer
FB = 0V
300 ns
Regulation and OV Comparators
FB Reference Threshold
Internal reference
2.445
2.5
2.550
V
Trip point for switch ON
FB Over-Voltage Threshold
Trip point for switch OFF
2.875
V
FB Bias Current
100 nA
Thermal Shutdown
Tsd Thermal Shutdown Temp.
165 ˚C
Thermal Shutdown Hysteresis
25 ˚C
Thermal Resistance
θJA Junction to Ambient
MUA Package
SDC Package
200 ˚C/W
40 ˚C/W
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device
is intended to be functional. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: For detailed information on soldering plastic MSOP and LLP packages, refer to the Packaging Data Book available from National Semiconductor
Corporation.
Note 3: All limits are guaranteed. All electrical characteristics having room temperature limits are tested during production with TA = TJ = 25˚C. All hot and cold limits
are guaranteed by correlating the electrical characteristics to process and temperature variations and applying statistical process control.
Note 4: The VCC output is intended as a self bias for the internal gate drive power and control circuits. Device thermal limitations limit external loading.
Note 5: The human body model is a 100pF capacitor discharge through a 1.5kΩ resistor into each pin. The human body ESD compliance level for Pin 7 and 8 is
1000V.
Note 6: For devices procurred in the LLP-8 package the Rds(on) limits are guaranteed by design characterization data only.
5 www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted
8-Lead MSOP Package
NS Package Number MUA08A
11 www.national.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LM25007.PDF ] | |
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