LM25007SD/NOPB National Semiconductor, LM25007SD/NOPB Datasheet

IC BUCK ADJ .5A 8LLP

LM25007SD/NOPB

Manufacturer Part Number
LM25007SD/NOPB
Description
IC BUCK ADJ .5A 8LLP
Manufacturer
National Semiconductor
Type
Step-Down (Buck)r
Datasheet

Specifications of LM25007SD/NOPB

Internal Switch(s)
Yes
Synchronous Rectifier
No
Number Of Outputs
1
Voltage - Output
2.5 ~ 37 V
Current - Output
500mA
Frequency - Switching
Up to 800kHz
Voltage - Input
9 ~ 42 V
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
8-LLP
Primary Input Voltage
42V
No. Of Outputs
1
Output Voltage
37V
Output Current
500mA
No. Of Pins
8
Operating Temperature Range
-40°C To +125°C
Msl
MSL 1 - Unlimited
Supply Voltage Range
9V To 42V
Rohs Compliant
Yes
Filter Terminals
SMD
For Use With
LM25007EVAL - BOARD EVALUATION LM25007
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Power - Output
-
Other names
LM25007SD
LM25007SDTR

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LM25007SD/NOPB
Manufacturer:
NS
Quantity:
793
Company:
Part Number:
LM25007SD/NOPB
Quantity:
8 000
© 2008 National Semiconductor Corporation
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.
Basic Step-Down Regulator
201655
Features
Typical Applications
Package
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°C to 125°C
Highly efficient operation
Intelligent current limit protection
External shutdown control
Thermal shutdown
MSOP-8 and thermally enhanced LLP packages
12VDC and 24VDC distributed rail systems
24VAC systems
Automotive body electronics and telematics
Industrial systems
HB-LED constant current source
MSOP - 8
LLP - 8 (4mm x 4mm)
20165513
February 5, 2008
www.national.com

Related parts for LM25007SD/NOPB

LM25007SD/NOPB Summary of contents

Page 1

... Additional features include: thermal shut- down, Vcc under-voltage lockout, gate drive under-voltage lockout, and max duty cycle limiter. Basic Step-Down Regulator © 2008 National Semiconductor Corporation Features ■ Integrated 0.74 ohm N-Channel MOSFET switch ■ ...

Page 2

Connection Diagram Ordering Information Order Number LM25007MM LM25007MMX LM25007SD LM25007SDX Pin Descriptions Pin Name 1 SW Switching Node 2 BST Boost Boot–strap capacitor input 3 RCL Current Limit OFF time programming pin 4 RTN Circuit Ground 5 FB Feedback Signal ...

Page 3

Typical Application Circuit and Block Diagram 3 20165501 www.national.com ...

Page 4

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. VIN to RTN BST to RTN SW to RTN (Steady State) ESD Rating (Note 5) Human Body Model Electrical Characteristics Specifications with standard type are for range ...

Page 5

... 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. ...

Page 6

Typical Performance Characteristics Operational Waveforms LM25007 Operation 10V 20V, I OUT IN CH1: Switch Node, CH2: V (AC), CH4: Inductor Current OUT LM25007 10V Output Efficiency 100k, 200k, 300k ...

Page 7

Detailed Operating Description The LM25007 is a monolithic step-down switching regulator featuring all of the functions needed to implement low cost, efficient, power supply. Capable of driving a 0.5Amp load over a 9-42V input voltage range, this device is easy ...

Page 8

FIGURE 1. Low Ripple Output Configuration FIGURE 2. Self Biased Configuration 8 20165505 20165506 ...

Page 9

Over-Voltage Comparator The over-voltage comparator is provided to protect the output from overvoltage conditions due to sudden input line voltage changes or output loading changes. The over-voltage com- parator monitors the FB pin versus an internal 2.875V refer- ence. If ...

Page 10

The reverse voltage rating of the re-circulating diode must be greater than the maximum line input voltage. Thermal Protection Internal Thermal Shutdown circuitry is provided to protect the integrated circuit in the event the maximum junction temper- ature is ...

Page 11

Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead MSOP Package NS Package Number MUA08A 8-Lead LLP Package NS Package Number SDC08A 11 www.national.com ...

Page 12

... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...

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