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LM34914

更新时间： 2024-11-11 11:14:59
品牌 Logo 应用领域
德州仪器 - TI 开关稳压器
页数 文件大小 规格书
21页 1196K
描述
具有智能电流限制的超小型 1.25A 降压开关稳压器

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LM34914 数据手册

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LM34914  
www.ti.com  
SNVS453B –MAY 2006–REVISED MARCH 2013  
LM34914 Ultra Small 1.25A Step-Down Switching Regulator with Intelligent Current Limit  
Check for Samples: LM34914  
1
FEATURES  
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 WSON-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.  
2
•
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  
TYPICAL APPLICATIONS  
•
•
•
High Efficiency Point-Of-Load (POL) Regulator  
Non-Isolated Buck Regulator  
Package  
•
•
WSON-10 (3 mm x 3mm)  
Exposed Thermal Pad For Improved Heat  
Dissipation  
Secondary High Voltage Post Regulator  
Basic Step Down Regulator  
8V - 40V  
Input  
V
CC  
V
IN  
C3  
C1  
LM34914  
R
ON  
BST  
SW  
L1  
RON/SD  
SS  
C4  
V
OUT  
SHUT  
DOWN  
D1  
R1  
R2  
R3  
ISEN  
FB  
C5  
C2  
RTN  
SGND  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
All trademarks are the property of their respective owners.  
2
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2006–2013, Texas Instruments Incorporated  
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