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LM34910 High Voltage (40V, 1.25A) Step Down Switching Regulator


source: | post time:2010-04-28

Part Number(s)
(NSID)
Top View Type Pins MSL Rating Peak Reflow RoHS
Status
CAD Symbols Models Package
Marking
Format
LM34910SD/NOPB
LM34910SD
LLP 10 1
1
260
260
Detail Download N/A
NS
UZXYTT
34910SD
LM34910SDX/NOPB
LM34910SDX
LLP 10 1
1
260
260
Detail Download N/A
NS
UZXYTT
34910SD

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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 compensation, 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.

 Applications

High Efficiency Point-Of-Load (POL) Regulator
Non-Isolated Telecommunication Buck Regulator
Secondary High Voltage Post Regulator

Features
Integrated 40V, N-Channel buck switch
Integrated start-up regulator
Input Voltage Range: 8V to 36V
No loop compensation required
Ultra-Fast transient response
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

Diagrams

Typical Application
click for larger image


 

 

Connection Diagram
click for larger image



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Next:LM34910C High Voltage (50V, 1.25A) Step Down Switching Regulator


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