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LM5116

更新时间： 2024-09-29 12:09:51
品牌 Logo 应用领域
德州仪器 - TI 控制器
页数 文件大小 规格书
37页 1452K
描述
LM5116 Wide Range Synchronous Buck Controller

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LM5116 数据手册

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LM5116  
www.ti.com  
SNVS499G –FEBRUARY 2007–REVISED MARCH 2013  
LM5116 Wide Range Synchronous Buck Controller  
Check for Samples: LM5116  
1
FEATURES  
DESCRIPTION  
The LM5116 is  
a synchronous buck controller  
2
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Emulated Peak Current Mode  
intended for step-down regulator applications from a  
high voltage or widely varying input supply. The  
control method is based upon current mode control  
utilizing an emulated current ramp. Current mode  
control provides inherent line feed-forward, cycle by  
cycle current limiting and ease of loop compensation.  
The use of an emulated control ramp reduces noise  
sensitivity of the pulse-width modulation circuit,  
allowing reliable control of very small duty cycles  
necessary in high input voltage applications. The  
operating frequency is programmable from 50 kHz to  
1 MHz. The LM5116 drives external high-side and  
low-side NMOS power switches with adaptive dead-  
time control. A user-selectable diode emulation mode  
enables discontinuous mode operation for improved  
efficiency at light load conditions. A low quiescent  
current shutdown disables the controller and  
consumes less than 10 µA of total input current.  
Wide Operating Range Up to 100V  
Low IQ Shutdown (< 10 µA)  
Drives Standard or logic Level MOSFETs  
Robust 3.5A Peak Gate Drive  
Free-run or Synchronous Operation to 1 MHz  
Optional Diode Emulation Mode  
Programmable Output from 1.215V to 80V  
Precision 1.5% Voltage Reference  
Programmable Current Limit  
Programmable Soft-Start  
Programmable Line Under-Voltage lockout  
Automatic Switch to External Bias Supply  
HTSSOP-20 Exposed Pad  
Thermal Shutdown  
Additional features include  
a high voltage bias  
regulator, automatic switch-over to external bias for  
improved efficiency, thermal shutdown, frequency  
synchronization, cycle by cycle current limit and  
adjustable line under-voltage lockout. The device is  
available in a power enhanced HTSSOP-20 package  
featuring an exposed die attach pad to aid thermal  
dissipation.  
Typical Application  
VIN  
VCC  
VIN  
LM5116  
C
VCC  
R
R
C
UV2  
IN  
HB  
UVLO  
V
IN  
UV1  
C
HB  
HO  
SW  
L
EN  
VOUT  
C
SYNC  
RT/ SYNC  
C
OUT  
LO  
CS  
R
T
R
S
COMP  
FB  
CSG  
C
COMP  
DEMB  
C
HF  
R
COMP  
VOUT  
VCCX  
R
R
FB2  
SS  
RAMP  
C
AGND PGND  
C
SS  
RAMP  
FB1  
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 © 2007–2013, Texas Instruments Incorporated  
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LM5116 替代型号

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