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TPS54326

更新时间： 2024-11-05 07:04:47
品牌 Logo 应用领域
德州仪器 - TI 转换器
页数 文件大小 规格书
22页 867K
描述
4.5V to 18V Input 3-A Synchronous Step-Down SWIFTTM Converter with Light Load Efficiency

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TPS54326 数据手册

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TPS54326  
www.ti.com  
SLVSA13A –OCTOBER 2009–REVISED OCTOBER 2009  
TM  
4.5V to 18V Input, 3-A Synchronous Step-Down SWIFT Converter with Light Load  
Efficiency  
Check for Samples: TPS54326  
1
FEATURES  
DESCRIPTION  
23  
•
D-CAP2™ Mode Enables Fast Transient  
Response  
The TPS54326 is an adaptive on-time D-CAP2™  
mode synchronous buck converter. The TPS54326  
enables system designers to complete the suite of  
various end equipment’s power bus regulators with a  
cost effective, low component count, low standby  
current solution. The main control loop for the  
TPS54326 uses the D-CAP2™ mode control which  
provides a fast transient response with no external  
components. The adoptive on-time control supports  
seamless operation between PWM mode at heavy  
load condition and reduced frequency operation at  
light load for high efficiency.  
•
Low Output Ripple and Allows Ceramic Output  
Capacitor  
•
•
•
•
Wide VCC Input Voltage Range: 4.5 V to 18 V  
Wide VIN Input Voltage Range: 2 V to 18 V  
Output Voltage Range: 0.76 V to 5.5 V  
Highly Efficient Integrated FET’s Optimized  
for Lower Duty Cycle Applications  
- 120 mΩ (High Side) and 70 mΩ (Low Side)  
•
•
•
•
•
•
•
High Efficiency, less than 10 μA at Shutdown  
High Initial Bandgap Reference Accuracy  
Adjustable Soft Start  
The TPS54326 also has a proprietary circuit that  
enables the device to adapt to both low equivalent  
series resistance (ESR) output capacitors, such as  
POSCAP or SP-CAP, and ultra-low ESR ceramic  
capacitors. The device operates from 4.5-V to 18-V  
VCC input , and from 2-V to 18-V VIN input power  
supply voltage. The output voltage can be  
programmed between 0.76 V and 5.5 V. The device  
also features an adjustable slow start time and a  
power good function. The TPS54326 is available in  
the 14 pin HTSSOP package, and designed to  
operate from –40°C to 85°C.  
Pre-Biased Soft Start  
700-kHz Switching Frequency (fSW  
Cycle-By-Cycle Overcurrent Limit  
Power Good Output  
)
APPLICATIONS  
•
Wide Range of Applications for Low Voltage  
System  
–
–
–
–
Digital TV Power Supply  
High Definition Blu-ray Disc™ Players  
Networking Home Terminal  
Digital Set Top Box (STB)  
V
(50 mV/div)  
OUT  
I
OUT  
(1 A/div)  
100 ms/div  
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
3
D-CAP2, PowerPAD are trademarks of Texas Instruments.  
Blu-ray Disc is a trademark of Blu-ray Disc Association.  
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 © 2009, Texas Instruments Incorporated  
 
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