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TPS54821_16

更新时间： 2024-09-16 02:58:31
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德州仪器 - TI /
页数 文件大小 规格书
37页 1363K
描述
4.5 V to 17 V Input, 8 A Synchronous Step Down Converter

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TPS54821_16 数据手册

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TPS54821  
www.ti.com  
SLVSB14 –OCTOBER 2011  
4.5 V to 17 V Input, 8 A Synchronous Step Down SWIFT™ Converter With Hiccup  
Check for Samples: TPS54821  
1
FEATURES  
23  
•
Integrated 26 mΩ / 19 mΩ MOSFETs  
Split Power Rail: 1.6 V to 17 V on PVIN  
200 kHz to 1.6 MHz Switching Frequency  
Synchronizes to External Clock  
•
•
•
Adjustable Input Undervoltage Lockout  
•
•
•
•
•
•
•
Software Tools Available  
For SWIFT™ Documentation visit  
http://www.ti.com/swift  
0.6V ±1% Voltage Reference Over Temperature  
Low 2 µA Shutdown Quiescent Current  
Monotonic Start-Up into Pre-biased Outputs  
APPLICATIONS  
•
•
•
•
•
Digital TV Power Supplies  
Set Top Boxes  
–40°C to 125°C Operating Junction  
Temperature Range  
Blu-ray DVDs  
Home Terminals  
•
•
Adjustable Slow Start/Power Sequencing  
High Performance Point of Load Regulation  
Power Good Output Monitor for Undervoltage  
and Overvoltage  
DESCRIPTION  
The TPS54821 in thermally enhanced 3.5 mm x 3.5 mm QFN package is a full featured 17 V, 8 A synchronous  
step down converter which is optimized for small designs through high efficiency and integrating the high-side  
and low-side MOSFETs. Further space savings are achieved through current mode control, which reduces  
component count, and by selecting a high switching frequency, reducing the inductor's footprint.  
The output voltage startup ramp is controlled by the SS/TR pin which allows operation as either a stand alone  
power supply or in tracking situations. Power sequencing is also possible by correctly configuring the enable and  
the open drain power good pins.  
Cycle by cycle current limiting on the high-side FET protects the device in overload situations and is enhanced  
by a low-side sourcing current limit which prevents current runaway. There is also a low-side sinking current limit  
which turns off the low-side MOSFET to prevent excessive reverse current. Hiccup protection will be triggered if  
the overcurrent condition has persisted for longer than the preset time. Thermal hiccup protection disables the  
device when the die temperature exceeds the thermal shutdown temperature and enables the part again after  
the built-in thermal shutdown hiccup time.  
WHITE SPACE  
SIMPLIFIED SCHEMATIC  
EFFICIENCY, VOUT = 3.3 V, FSW = 480 kHz  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
PVIN  
VIN  
VIN  
Cboot  
TPS54821  
BOOT  
Cin  
VOUT  
Lo  
EN  
PH  
Co  
PWRGD  
R1  
VSENSE  
SS/TR  
R2  
RT/CLK  
COMP  
GND  
VIN = 8 V  
VIN = 12 V  
VIN = 17 V  
R3  
C1  
Exposed  
Thermal  
Pad  
Css  
Rrt C2  
0
1
2
3
4
5
6
7
8
Output Current (A)  
G001  
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
SWIFT is a trademark of Texas Instruments.  
All other trademarks are the property of their respective owners.  
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 © 2011, Texas Instruments Incorporated  
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