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TPS54331_1

更新时间： 2024-11-18 07:04:47
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
24页 880K
描述
3A, 28V INPUT, STEP DOWN SWIFTM DC/DC CONVERTER WITH ECO-MODTM

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TPS54331_1 数据手册

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TPS54331  
www.ti.com ...................................................................................................................................................... SLVS839B–JULY 2008–REVISED OCTOBER 2008  
3A, 28V INPUT, STEP DOWN SWIFT™ DC/DC CONVERTER WITH ECO-MODE™  
1
FEATURES  
DESCRIPTION  
2
•
•
•
3.5V to 28V Input Voltage Range  
Adjustable Output Voltage Down to 0.8V  
The TPS54331 is a 28-V, 3-A non-synchronous buck  
converter that integrates a low Rds(on) high side  
MOSFET. To increase efficiency at light loads, a  
pulse skipping Eco-mode™ feature is automatically  
activated. Furthermore, the 1 µA shutdown supply  
current allows the device to be used in battery  
powered applications. Current mode control with  
internal slope compensation simplifies the external  
compensation calculations and reduces component  
count while allowing the use of ceramic output  
capacitors. A resistor divider programs the hysteresis  
of the input under-voltage lockout. An overvoltage  
transient protection circuit limits voltage overshoots  
during startup and transient conditions. A cycle by  
cycle current limit scheme, frequency fold back and  
thermal shutdown protect the device and the load in  
the event of an overload condition. The TPS54331 is  
available in an 8-pin SOIC package that has been  
internally optimized to improve thermal performance.  
Integrated 80 mΩ High Side MOSFET Supports  
up to 3A Continuous Output Current  
•
High Efficiency at Light Loads with a Pulse  
Skipping Eco-mode™  
•
•
•
•
•
•
Fixed 570kHz Switching Frequency  
Typical 1µA Shutdown Quiescent Current  
Adjustable Slow Start Limits Inrush Currents  
Programmable UVLO Threshold  
Overvoltage Transient Protection  
Cycle by Cycle Current Limit, Frequency Fold  
Back and Thermal Shutdown Protection  
•
•
Available in Easy-to-Use SOIC8 Package  
Supported by SwitcherPro™ Software Tool  
(http://focus.ti.com/docs/toolsw/folders/print/s  
witcherpro.html)  
•
For SWIFT™ Documentation, See the TI  
Website at www.ti.com/swift  
APPLICATIONS  
•
Consumer Applications such as Set-Top  
Boxes, CPE Equipment, LCD Displays,  
Peripherals, and Battery Chargers  
•
•
Industrial and Car Audio Power Supplies  
5V, 12V and 24V Distributed Power Systems  
SIMPLIFIED SCHEMATIC  
EFFICIENCY  
100  
90  
Ren1  
EN  
VIN  
CI  
VIN  
80  
Ren2  
V
= 12 V  
I
70  
60  
TPS54331  
V
= 18 V  
I
CBOOT  
V
= 24 V  
I
BOOT  
PH  
LO  
V = 28 V  
I
50  
40  
V
= 5 V  
VOUT  
I
SS  
CO  
30  
20  
10  
0
D1  
RO1  
COMP  
C1  
R3  
CSS  
V
1
= 3.3 V  
O
C2  
VSENSE  
GND  
0.01  
0.1  
10  
RO2  
I
- Load Current - A  
L
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.  
2
SWIFT, Eco-mode, SwitcherPro 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 © 2008, Texas Instruments Incorporated  
1234567...24

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