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LM25018

更新时间： 2024-11-15 01:00:23
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德州仪器 - TI /
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18页 337K
描述
48V, 325mA Constant On-Time Synchronous Buck Regulator

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LM25018 数据手册

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LM25018  
www.ti.com  
SNVS953 –DECEMBER 2012  
LM25018 48V, 325mA Constant On-Time Synchronous Buck Regulator  
Check for Samples: LM25018  
1
FEATURES  
•
•
•
•
Frequency Adjustable to 1MHz  
Adjustable Undervoltage Lockout  
Remote Shutdown  
2
•
•
•
•
•
•
•
•
•
•
Wide 9V to 48V Input Range  
Integrated 48V, High and Low Side Switches  
No Schottky Required  
Thermal Shutdown  
Constant On-time Control  
APPLICATIONS  
No Loop Compensation Required  
Ultra-Fast Transient Response  
Nearly Constant Operating Frequency  
Intelligent Peak Current Limit  
•
•
•
•
Industrial Equipments  
Smart Power Meters  
Telecommunication Systems  
Isolated Bias Supply  
Adjustable Output Voltage from 1.225V  
Precision 2% Feedback Reference  
DESCRIPTION  
The LM25018 is a 48V, 325mA synchronous step-down regulator with integrated high side and low side  
MOSFETs. The constant-on-time (COT) control scheme employed in the LM25018 requires no loop  
compensation, provides excellent transient response, and enables very low step-down ratios. The on-time varies  
inversely with the input voltage resulting in nearly constant frequency over the input voltage range. A high voltage  
startup regulator provides bias power for internal operation of the IC and for integrated gate drivers.  
A peak current limit circuit protects against overload conditions. The undervoltage lockout (UVLO) circuit allows  
the input undervoltage threshold and hysteresis to be independently programmed. Other protection features  
include thermal shutdown and bias supply undervoltage lockout.  
The LM25018 is available in LLP-8 and PSOP-8 plastic packages.  
Packages  
•
•
LLP-8  
PSOP-8  
Typical Application  
LM25018  
9V-48V  
VIN  
7
8
BST  
2
4
+
V
L1  
C
IN  
VOUT  
BST  
+
SW  
C
IN  
RON  
R
UV2  
C
VCC  
R
ON  
VCC  
FB  
R
FB2  
3
R
C
UVLO  
6
5
SD  
+
R
UV1  
RTN  
C
OU  
T
R
FB1  
1
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, Texas Instruments Incorporated  
1234567...18

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