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TPS54320_11

更新时间： 2024-11-05 08:38:59
品牌 Logo 应用领域
德州仪器 - TI 转换器
页数 文件大小 规格书
39页 1363K
描述
4.5V to 17V Input, 3A Synchronous Step Down SWIFT Converter

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TPS54320_11 数据手册

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TPS54320  
www.ti.com  
SLVS982A –AUGUST 2010–REVISED SEPTEMBER 2010  
4.5V to 17V Input, 3A Synchronous Step Down SWIFT™ Converter  
Check for Samples: TPS54320  
1
FEATURES  
•
Power Good Output for Undervoltage and  
Overvoltage Monitoring  
2
•
•
•
•
•
•
•
•
•
Integrated 57mΩ / 50mΩ MOSFETs  
Split Power Rail: 1.6V to 17V on PVIN  
200kHz to 1.2MHz Switching Frequency  
Synchronizes to External Clock  
•
•
•
Adjustable Input Undervoltage Lockout  
Supported by SwitcherPro ™Software Tool  
For SWIFT™ Documentation and  
SwitcherPro™, visit http://www.ti.com/swift  
0.8V Voltage Reference With ±1% Accuracy  
Low 2µA Shutdown Quiescent Current  
Hiccup Overcurrent Protection  
APPLICATIONS  
•
Broadband, Networking & Communication  
Infrastructure  
Automated Test and Medical Equipment  
DSP and FPGA Point-of-Load Applications  
from 12-V Bus  
Monotonic Start-Up into Prebiased Outputs  
•
•
–40°C to 150°C Operating Junction  
Temperature Range  
•
•
Pin-to-Pin Compatible with the TPS54620  
Adjustable Slow Start/Power Sequencing  
DESCRIPTION  
The TPS54320 is a full featured 17V, 3A synchronous step down converter which is optimized for small designs  
through high efficiency and integrated 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. Hiccup protection will be triggered if the  
overcurrent condition has persisted for longer than the preset time. Thermal shutdown disables the part when die  
temperature exceeds thermal shutdown temperature. The TPS54320 is available in a 14 pin, 3.5mm x 3.5mm  
QFN, thermally enhanced package.  
WHITE SPACE  
SIMPLIFIED SCHEMATIC  
100  
PVIN  
VIN  
VIN  
95  
Cboot  
TPS54320  
BOOT  
90  
85  
80  
75  
70  
65  
60  
Cin  
VOUT  
Lo  
VOUT = 5 V  
VOUT = 3.3 V  
EN  
PH  
VOUT = 1.8 V  
Co  
PWRGD  
R1  
VSENSE  
SS/TR  
R2  
RT/CLK  
COMP  
GND  
VIN = 12 V,  
Fsw = 500 kHz  
R3  
C1  
Exposed  
Thermal  
Pad  
55  
50  
Css  
Rrt C2  
0
0.5  
1
1.5  
Load Current - A  
2
2.5  
3
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
SwitcherPro, SWIFT 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 © 2010, Texas Instruments Incorporated  
 
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