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LM34914 Ultra Small 1.25A Step-Down Switching Regulator with Intelligent Current Limit


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
LM34914SD/NOPB
LM34914SD
LLP 10 1
1
260
260
Detail N/A N/A
ZXYTT
34914
LM34914SDX/NOPB
LM34914SDX
LLP 10 1
1
260
260
Detail N/A N/A
ZXYTT
34914

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Description

The LM34914 Step-Down Switching Regulator features all the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying at least 1.25A to the load. To reduce excessive switch current due to the possibility of a saturating inductor the valley current limit threshold changes with input and output voltages, and the on-time is reduced when current limit is detected. This buck regulator contains a 44V N-Channel Buck Switch, and is available in the thermally enhanced 3 mm x 3 mm LLP-10 package. The 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 lock-out, thermal shutdown, gate drive under-voltage lock-out, and maximum duty cycle limit.

Features

Input Voltage Range: 8V to 40V
Integrated N-Channel buck switch
Valley current limit varies with VIN and VOUT to reduce excessive inductor current
On-time is reduced when in current limit
Integrated start-up regulator
No loop compensation required
Ultra-Fast transient response
Maximum switching frequency: 1.3 MHz
Operating frequency remains nearly constant with load current and input voltage variations
Programmable soft-start
Precision internal reference
Adjustable output voltage
Thermal shutdown

Diagrams

Typical Application
*click for larger image


 

 

 

Block Diagram
*click for larger image


 


Typical Performance
*click for larger image


 


Prev:LM34910C High Voltage (50V, 1.25A) Step Down Switching Regulator
Next:LM34917A Ultra Small 33V, 1.25A Constant On-Time Buck Switching Regulator with Intelligent Current Limit from the PowerWise® Family


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