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LM3481QMM

更新时间： 2024-11-23 12:48:31
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德州仪器 - TI 开关控制器
页数 文件大小 规格书
30页 1132K
描述
LM3481/LM3481Q High Efficiency Low-Side N-Channel Controller for Switching

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LM3481  
www.ti.com  
SNVS346E –NOVEMBER 2007–REVISED APRIL 2012  
LM3481/LM3481Q High Efficiency Low-Side N-Channel Controller for Switching  
Regulators  
Check for Samples: LM3481  
1
FEATURES  
KEY SPECIFICATIONS  
2
•
LM3481QMM in the VSSOP-10 Package are  
Automotive Grade Products that are AEC-Q100  
Grade 1 Qualified (-40°C to +125°C Operating  
Junction Temperature)  
•
•
Wide Supply Voltage Range of 2.97V to 48V  
100 kHz to 1 MHz Adjustable and  
Synchronizable Clock Frequency  
•
•
±1.5% (Over Temperature) Internal Reference  
10 µA Shutdown Current (Over Temperature)  
•
•
10-Lead VSSOP Package  
Internal Push-Pull Driver with 1A Peak Current  
Capability  
DESCRIPTION  
•
•
Current Limit and Thermal Shutdown  
The LM3481 is a versatile Low-Side N-FET high  
performance controller for switching regulators. It is  
suitable for use in topologies requiring a low-side  
FET, such as boost, flyback, SEPIC, etc. The  
LM3481 can be operated at extremely high switching  
frequencies in order to reduce the overall solution  
size. The switching frequency of the LM3481 can be  
adjusted to any value between 100 kHz and 1 MHz  
by using a single external resistor or by synchronizing  
it to an external clock. Current mode control provides  
superior bandwidth and transient response in addition  
to cycle-by-cycle current limiting. Current limit can be  
programmed with a single external resistor.  
Frequency Compensation Optimized with a  
Capacitor and a Resistor  
•
•
•
Internal Softstart  
Current Mode Operation  
Adjustable Undervoltage Lockout with  
Hysteresis  
•
Pulse Skipping at Light Loads  
APPLICATIONS  
•
•
Distributed Power Systems  
The LM3481 has built in protection features such as  
thermal shutdown, short-circuit protection and over  
voltage protection. Power saving shutdown mode  
reduces the total supply current to 5µA and allows  
power supply sequencing. Internal soft-start limits the  
inrush current at start-up.  
Notebook, PDA, Digital Camera, and other  
Portable Applications  
•
•
Offline Power Supplies  
Set-Top Boxes  
TYPICAL APPLICATION CIRCUIT  
R7  
V
IN  
= 3.0V to 48V  
+
C
IN  
R8  
L1  
V
IN  
I
SEN  
V
= 5V, 1A  
OUT  
OUT  
UVLO  
V
CC  
C
C
R
C
C
BYP  
C
D1  
+
S
COMP LM3481  
DR  
C
Q1  
L2  
FB  
PGND  
R
F2  
AGND  
FA/SYNC/SD  
C
R
SEN  
SEN  
R
FA  
R
F1  
Figure 1. Typical SEPIC Converter  
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 © 2007–2012, Texas Instruments Incorporated  
1234567...30

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