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LM34919B

更新时间： 2024-09-18 02:58:23
品牌 Logo 应用领域
德州仪器 - TI /
页数 文件大小 规格书
27页 1278K
描述
Ultra-Small 40-V 600-mA Constant On-Time Buck Switching Regulator

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LM34919B 数据手册

 浏览型号LM34919B的Datasheet PDF文件第2页浏览型号LM34919B的Datasheet PDF文件第3页浏览型号LM34919B的Datasheet PDF文件第4页浏览型号LM34919B的Datasheet PDF文件第5页浏览型号LM34919B的Datasheet PDF文件第6页浏览型号LM34919B的Datasheet PDF文件第7页 
LM34919B  
LM34919B-Q1  
www.ti.com  
SNVS623B –MAY 2010–REVISED JULY 2013  
LM34919B Ultra-Small 40-V 600-mA Constant On-Time  
Buck Switching Regulator  
Check for Samples: LM34919B, LM34919B-Q1  
1
FEATURES  
TYPICAL APPLICATIONS  
2
•
•
AEC-Q100 Grade 1 Qualified (-40°C to 125°C)  
•
•
•
Automotive Safety and Infotainment  
Maximum Switching Frequency: 2.6 MHz  
(VIN=14V,Vo=3.3V)  
High Efficiency Point-Of-Load (POL) Regulator  
Non-Isolated Telecommunication Buck  
Regulator  
•
•
•
•
•
•
Input Voltage Range: 6V to 40V  
Integrated N-Channel Buck Switch  
Integrated Startup Regulator  
No loop compensation Required  
Ultra-Fast transient Response  
•
Secondary High Voltage Post Regulator  
DESCRIPTION  
The LM34919B 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 10-pin DSBGA 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.  
Operating frequency remains constant with  
Load Current and Input Voltage  
•
•
•
•
•
•
•
•
Maximum Duty Cycle Limited During Startup  
Adjustable Output Voltage  
Valley Current Limit At 0.64A  
Precision Internal Reference  
Low Bias Current  
Highly Efficient Operation  
Thermal Shutdown  
10-Pin DSBGA Package  
Basic Step-Down Regulator  
6V - 40V  
Input  
VIN  
VCC  
C3  
C1  
LM34919B  
R
ON  
BST  
SW  
C4  
L1  
RON/SD  
V
OUT  
SHUTDOWN  
D1  
R1  
R2  
R3  
SS  
ISEN  
FB  
C2  
C6  
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 © 2010–2013, Texas Instruments Incorporated  
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LM34919B 替代型号

型号 品牌 替代类型 描述 数据表
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