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PDF LM34910 Data sheet ( Hoja de datos )
| Número de pieza | LM34910 | |
| Descripción | Step Down Switching Regulator | |
| Fabricantes | National Semiconductor | |
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February 2005
LM34910
High Voltage (40V, 1.25A) Step Down Switching
Regulator
General Description
The LM34910 Step Down Switching Regulator features all of
the functions needed to implement a low cost, efficient, buck
bias regulator capable of supplying 1.25A to the load. This
buck regulator contains a 40V N-Channel Buck Switch, and
is available in the thermally enhanced LLP-10 package. The
hysteretic regulation scheme requires no loop compensa-
tion, results in fast load transient response, and simplifies
circuit implementation. The operating frequency remains
constant with line and load variations due to the inverse
relationship between the input voltage and the on-time. The
current limit detection is set at 1.25A. Additional features
include: VCC under-voltage lockout, thermal shutdown, gate
drive under-voltage lockout, and maximum duty cycle limiter.
Features
n Integrated 40V, N-Channel buck switch
n Integrated start-up regulator
n Input Voltage Range: 8V to 36V
n No loop compensation required
n Ultra-Fast transient response
n Operating frequency remains constant with load current
and input voltage
n Maximum Duty Cycle Limited During Start-Up
n Adjustable output voltage
n Valley Current Limit At 1.25A
n Precision internal reference
n Low bias current
n Highly efficient operation
n Thermal shutdown
Typical Applications
n High Efficiency Point-Of-Load (POL) Regulator
n Non-Isolated Telecommunication Buck Regulator
n Secondary High Voltage Post Regulator
Package
n LLP-10 (4 mm x 4 mm)
n Exposed Thermal Pad For Improved Heat Dissipation
Connection Diagram
Ordering Information
Order Number
LM34910SD
LM34910SDX
Package Type
LLP-10 (4x4)
LLP-10 (4x4)
10-Lead LLP
20110902
NSC Package Drawing
SDC10A
SDC10A
Supplied As
1000 Units on Tape and Reel
4500 Units on Tape and Reel
© 2005 National Semiconductor Corporation DS201109
www.national.com
1 page  
Electrical Characteristics Specifications with standard typeface are for TJ = 25˚C, and those with boldface
type apply over full Operating Junction Temperature range. VIN = 24V, RON = 200k unless otherwise stated (Note
5). (Continued)
Symbol
Parameter
Thermal Shutdown
TSD Thermal shutdown
temperature
Thermal shutdown hysteresis
Conditions
Min
Typ
Max
Units
175 ˚C
20 ˚C
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: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
Note 3: VCC provides self bias for the internal gate drive and control circuits. Device thermal limitations limit external loading
Note 4: For detailed information on soldering plastic LLP packages, refer to the Packaging Data Book available from National Semiconductor Corporation.
Note 5: Typical specifications represent the most likely parametric norm at 25˚C operation.
Typical Performance Characteristics
FIGURE 2. VCC vs VIN
20110904
20110905
FIGURE 3. ON-Time vs VIN and RON
5
www.national.com
5 Page 
Physical Dimensions inches (millimeters) unless otherwise noted
10-Lead LLP Package
NS Package Number SDC10A
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS
WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to result
in a significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
BANNED SUBSTANCE COMPLIANCE
National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products
Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain
no ‘‘Banned Substances’’ as defined in CSP-9-111S2.
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Support Center
Email: [email protected]
Tel: 1-800-272-9959
www.national.com
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Fax: +49 (0) 180-530 85 86
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11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LM34910.PDF ] | |
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