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PDF LM34910C Data sheet ( Hoja de datos )
| Número de pieza | LM34910C | |
| Descripción | Step Down Switching Regulator | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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August 2007
LM34910C
High Voltage (50V, 1.25A) Step Down Switching Regulator
General Description
The LM34910C 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 55V N-Channel Buck Switch,
and is available in the thermally enhanced LLP-10 package.
The hysteretic regulation scheme requires no loop compen-
sation, results in fast load transient response, and simplifies
circuit implementation. The operating frequency remains con-
stant with line and load variations due to the inverse relation-
ship 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 un-
der-voltage lockout, and maximum duty cycle limiter.
Features
■ Operating frequency remains constant with load current
and input voltage
■ Maximum Duty Cycle Limited During Start-Up
■ Adjustable output voltage
■ Valley Current Limit At 1.25A
■ Precision internal reference
■ Low bias current
■ Highly efficient operation
■ Thermal shutdown
Typical Applications
■ High Efficiency Point-Of-Load (POL) Regulator
■ Non-Isolated Telecommunication Buck Regulator
■ Secondary High Voltage Post Regulator
■ Integrated 55V, N-Channel buck switch
■ Integrated start-up regulator
■ Input Voltage Range: 8V to 50V
■ No loop compensation required
■ Ultra-Fast transient response
Package
■ LLP-10 (4 mm x 4 mm)
■ Exposed Thermal Pad For Improved Heat Dissipation
Connection Diagram
Ordering Information
Order Number
LM34910CSD
LM34910CSDX
LM34910CSDE
Package Type
LLP-10 (4x4)
LLP-10 (4x4)
LLP-10 (4x4)
10-Lead LLP
30023502
NSC Package Drawing
SDC10A
SDC10A
SDC10A
Supplied As
1000 Units on Tape and Reel
4500 Units on Tape and Reel
250 Units on Tape and Reel
© 2007 National Semiconductor Corporation 300235
www.national.com
1 page  
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
30023504
30023520
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
11 www.national.com
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LM34910C.PDF ] | |
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