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LM34922MYX/NOPB

更新时间： 2024-09-18 01:12:55
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德州仪器 - TI /
页数 文件大小 规格书
19页 1031K
描述
28V, 2A Constant On-Time Switching Regulator with Adjustable Current Limit

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LM34922MYX/NOPB 数据手册

 浏览型号LM34922MYX/NOPB的Datasheet PDF文件第2页浏览型号LM34922MYX/NOPB的Datasheet PDF文件第3页浏览型号LM34922MYX/NOPB的Datasheet PDF文件第4页浏览型号LM34922MYX/NOPB的Datasheet PDF文件第5页浏览型号LM34922MYX/NOPB的Datasheet PDF文件第6页浏览型号LM34922MYX/NOPB的Datasheet PDF文件第7页 
LM34922  
www.ti.com  
SNVS813A –JUNE 2012–REVISED MARCH 2013  
LM34922 28V, 2A Constant On-Time Switching Regulator with Adjustable Current Limit  
Check for Samples: LM34922  
1
FEATURES  
•
•
Thermal Shutdown  
Precision 2% Feedback Reference  
2
•
Input Operating Voltage Range: 6V to 28V  
Absolute Maximum Input Rating: 30V  
Integrated 2A N-Channel Buck Switch  
•
•
•
DESCRIPTION  
The LM34922 Constant On-time Step-Down  
Switching Regulator features all the functions needed  
to implement a low cost, efficient, buck bias regulator  
capable of supplying up to 2A of load current. This  
voltage regulator contains an N-Channel Buck switch,  
a startup regulator, current limit detection, and  
internal ripple control. 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 adjustable  
valley current limit detection results in a smooth  
transition from constant voltage to constant current  
mode when current limit is reached, without the use  
of current limit foldback. The PGD output indicates  
the output voltage has increased to within 5% of the  
expected regulation value. Additional features  
include: Low output ripple, VIN under-voltage lock-  
out, adjustable soft-start timing, thermal shutdown,  
gate drive pre-charge, gate drive under-voltage lock-  
out, and maximum duty cycle limit.  
Adjustable Current Limit Allows for Smaller  
Inductor  
•
•
•
•
•
Adjustable Output Voltage from 2.51V  
Minimum Ripple Voltage at VOUT  
Power Good Output  
Switching Frequency Adjustable to 1MHz  
COT Topology Features:  
–
Switching Frequency Remains Nearly  
Constant with Load Current and Input  
Voltage Variations  
–
–
–
Ultra-Fast Transient Response  
No Loop Compensation Required  
Stable Operation with Ceramic Output  
Capacitors  
–
Allows for Smaller Output Capacitor and  
Current Sense Resistor  
•
Adjustable Soft-Start Timing  
Typical Application, Basic Step-Down Regulator  
6V to 28V  
Input  
VIN  
BST  
CBST  
L1  
LM34922  
CIN  
RT  
SW  
CS  
D1  
RS  
RT  
VOUT  
RPGD  
VPGD  
COUT  
Power  
PGD  
Good  
RFB2  
CSG  
FB  
SS  
CSS  
SGND  
RFB1  
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 © 2012–2013, Texas Instruments Incorporated  
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LM34922MYX/NOPB 替代型号

型号 品牌 替代类型 描述 数据表
LM34922MY/NOPB TI

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 28V, 2A Constant On-Time Switching Regulator with Adjustable Current Limit

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