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TPS54226_17

更新时间： 2024-11-21 02:58:27
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德州仪器 - TI /
页数 文件大小 规格书
28页 1042K
描述
4.5V to 18V Input, 2-A Synchronous Step-Down SWIFTTM Converter with Eco-Mode

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TPS54226_17 数据手册

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TPS54226  
www.ti.com  
SLVSA14E –OCTOBER 2009–REVISED JULY 2011  
TM  
4.5V to 18V Input, 2-A Synchronous Step-Down SWIFT Converter with Eco-Mode™  
Check for Samples: TPS54226  
1
FEATURES  
APPLICATIONS  
23  
•
D-CAP2™ Mode Enables Fast Transient  
Response  
•
Wide Range of Applications for Low Voltage  
System  
•
Low Output Ripple and Allows Ceramic Output  
Capacitor  
–
–
–
–
Digital TV Power Supply  
High Definition Blu-ray Disc™ Players  
Networking Home Terminal  
Digital Set Top Box (STB)  
•
•
•
•
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  
DESCRIPTION  
Highly Efficient Integrated FET’s Optimized  
for Lower Duty Cycle Applications  
The TPS54226 is a adaptive on-time D-CAP2™  
mode synchronous buck converter. TheTPS54226  
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  
TPS54226 uses the D-CAP2™ mode control which  
provides a fast transient response with no external  
compensation components. The adoptive on-time  
control supports seamless operation between PWM  
mode at heavy load condition and reduced frequency  
Eco-Mode™ operation at light load for high efficiency.  
The TPS54226 also has a proprietary circuit that  
enables the device to adopt 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 TPS54226 is available in  
the 14 pin HTSSOP or 16 pin QFN package, and  
designed to operate from –40°C to 85°C.  
– 160 mΩ (High Side) and 110 mΩ (Low Side)  
•
•
High Efficiency, less than 10 μA at shutdown  
Auto-Skip Eco-Mode™ for High Efficiency at  
Light Load  
•
•
•
•
•
•
•
High Initial Bandgap Reference Accuracy  
Adjustable Soft Start  
Pre-Biased Soft Start  
700-kHz Switching Frequency (fSW  
)
Cycle By Cycle Over Current Limit  
Power Good Output  
Auto-Skip Mode  
V
- 50 mA/div  
OUT  
I
- 1 A/div  
OUT  
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, Eco-Mode, 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 © 2009–2011, Texas Instruments Incorporated  
 
 
 
 
 
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