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LM34919 Ultra Small 40V, 600 mA Constant On-Time Buck Switching Regulator from the PowerWise® Family


source: | post time:2010-04-29

Part Number(s)
(NSID)
Top View Type Pins MSL Rating Peak Reflow RoHS
Status
CAD Symbols Models Package
Marking
Format
LM34919ATL/NOPB
MICRO SMD 10 1 260 Detail N/A N/A
XYTT
I SRYA
LM34919ATLX/NOPB
MICRO SMD 10 1 260 Detail N/A N/A
XYTT
I SRYA
LM34919TL/NOPB
MICRO SMD 10 1 260 Detail N/A N/A
XYTT
I SRYB
LM34919TLX/NOPB
MICRO SMD 10 1 260 Detail N/A N/A
XYTT
I SRYB

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Description

The LM34919 Step Down Switching Regulator features all of the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying 0.6A to the load. This buck regulator contains an N-Channel Buck Switch, and is available in a micro SMD package. The constant on-time feedback 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 valley current limit results in a smooth transition from constant voltage to constant current mode when current limit is detected, reducing the frequency and output voltage, without the use of foldback. Additional features include: VCC under-voltage lockout, thermal shutdown, gate drive under-voltage lockout, and maximum duty cycle limiter.

Features

Integrated N-Channel buck switch
Integrated start-up regulator
Input Voltage Range: 8V to 40V
No loop compensation required
Ultra-Fast transient response
Operating frequency remains constant with load current and input voltage
Maximum switching frequency: 2.0 MHz
Maximum Duty Cycle Limited During Start-Up
Adjustable output voltage
Valley Current Limit At 0.64A
Precision internal reference
Low bias current
Highly efficient operation
Thermal shutdown

Diagrams

Typical Application
*click for larger image


 

 

 

Block Diagram
*click for larger image


 


Typical Performance
*click for larger image


 


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Next:LM34930 Ultra Small 33V, 1A Constant On-Time Buck Switching Regulator with Intelligent Current Limit from the PowerWise® Family


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