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


source: | post time:2010-04-30

Part Number(s)
(NSID)
Top View Type Pins MSL Rating Peak Reflow RoHS
Status
CAD Symbols Models Package
Marking
Format
LM34930TL/NOPB
MICRO SMD 12 1 260 Detail Download N/A
XYTT
I STCB
LM34930TLX/NOPB
MICRO SMD 12 1 260 Detail Download N/A
XYTT
I STCB

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Description

The LM34930 constant On-Time Step Down Switching Regulator features all the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying in excess of 1A load current. This high voltage regulator contains an N-Channel Buck Switch, and is available in a µSMD bumped package. The constant on-time regulation principle requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load. The valley current limit results in a smooth transition from constant voltage to constant current mode when current limit is detected without the use of current limit foldback. To reduce the possibility of saturating the inductor the valley current limit threshold reduces as the input voltage increases, and the on-time is reduced when current limit is detected. Additional features include: Over-voltage indicator, Input over-voltage shutdown, Vcc under-voltage lock-out, thermal shutdown, and maximum duty cycle limiting.

Features

Operating Input Voltage Range: 8V to 33V
Input over-voltage shutdown at 36V
Input absolute maximum rating of 44V
Integrated 1A N-Channel buck switch
Adjustable output voltage from 2.5V
Switching frequency adjustable to 2 MHz
Switching frequency remains nearly constant with load current and input voltage
Ultra-fast transient response
No loop compensation required
Adjustable soft-start timing
Thermal shutdown
Precision 2% feedback reference
Input Over-Voltage indicator at 19V
Current limit scheme helps prevent inductor from saturation in load fault conditions

Diagrams

Typical Application
*click for larger image


 

 

 

Block Diagram
*click for larger image


 


Typical Performance
*click for larger image


 


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Next:LM3578A Switching Regulator


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