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TPS5450

更新时间： 2024-11-10 04:27:31
品牌 Logo 应用领域
德州仪器 - TI 转换器输入元件
页数 文件大小 规格书
20页 472K
描述
5-A, WIDE INPUT RANGE, STEP-DOWN SWIFT CONVERTER

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TPS5450 数据手册

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TPS5450  
www.ti.com  
SLVS757–MARCH 2007  
5-A, WIDE INPUT RANGE, STEP-DOWN SWIFT™ CONVERTER  
FEATURES  
APPLICATIONS  
•
•
•
•
High Density Point-of-Load Regulators  
LCD Displays, Plasma Displays  
Battery Chargers  
•
Wide Input Voltage Range: 5.5 V to 36 V  
•
Up to 5-A Continuous (6-A Peak) Output  
Current  
12-V/24-V Distributed Power Systems  
•
•
•
•
High Efficiency Greater than 90% Enabled by  
110-mΩ Integrated MOSFET Switch  
DESCRIPTION  
Wide Output Voltage Range: Adjustable Down  
to 1.22 V with 1.5% Initial Accuracy  
As a member of the SWIFT™ family of DC/DC  
regulators, the TPS5450 is a high-output-current  
PWM converter that integrates a low resistance high  
side N-channel MOSFET. Included on the substrate  
with the listed features are a high performance  
voltage error amplifier that provides tight voltage  
regulation accuracy under transient conditions; an  
undervoltage-lockout circuit to prevent start-up until  
the input voltage reaches 5.5 V; an internally set  
slow-start circuit to limit inrush currents; and a  
voltage feed-forward circuit to improve the transient  
response. Using the ENA pin, shutdown supply  
current is reduced to 18 µA typically. Other features  
include an active-high enable, overcurrent limiting,  
overvoltage protection and thermal shutdown. To  
reduce design complexity and external component  
count, the TPS5450 feedback loop is internally  
compensated.  
Internal Compensation Minimizes External  
Parts Count  
Fixed 500 kHz Switching Frequency for Small  
Filter Size  
•
•
18 µA Shut Down Supply Current  
Improved Line Regulation and Transient  
Response by Input Voltage Feed Forward  
•
System Protected by Overcurrent Limiting,  
Overvoltage Protection and Thermal  
Shutdown  
•
•
•
–40°C to 125°C Operating Junction  
Temperature Range  
Available in Small Thermally Enhanced 8-Pin  
SOIC PowerPAD™ Package  
For SWIFT™ Documentation, Application  
Notes and Design Software, See the TI  
Website at www.ti.com/swift  
The TPS5450 device is available in a thermally  
enhanced, 8-pin SOIC PowerPAD™ package. TI  
provides evaluation modules and software tool to aid  
in achieving high-performance power supply designs  
to meet aggressive equipment development cycles.  
Simplified Schematic  
Efficiency vs Output Current  
100  
95  
90  
85  
80  
75  
70  
VIN  
VOUT  
VIN  
PH  
BOOT  
NC  
NC  
ENA VSENSE  
GND  
V
V
= 12 V,  
= 5 V,  
65  
60  
I
O
f
= 500 kHz,  
s
55  
50  
T
= 25°C  
A
0
1
2
3
4
- Output Current - A  
5
6
I
O
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.  
SWIFT, PowerPAD are trademarks of Texas Instruments.  
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–, Texas Instruments Incorporated  
1234567...20

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