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TPS54040A_16

更新时间： 2024-12-01 02:58:39
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德州仪器 - TI /
页数 文件大小 规格书
48页 2445K
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Step-Down DC-DC Converter

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TPS54040A_16 数据手册

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TPS54040A  
www.ti.com  
SLVSB58 –MARCH 2012  
0.5 A, 42 V Step Down SWIFT™ DC/DC Converter with ECO-MODE™  
Check for Samples: TPS54040A  
1
FEATURES  
23  
•
3.5 V to 42 V Input Voltage Range  
•
•
•
0.8-V Internal Voltage Reference  
•
200-mΩ High-Side MOSFET  
Available in MSOP-10 and VSON-10 Packages  
Supported by WEBENCH® and SwitcherPro™  
Software Tool  
•
High Efficiency at Light Loads with a Pulse  
Skipping Eco-Mode™  
•
Tighter Enable Threshold than TPS54040  
for More Accurate UVLO Voltage  
•
For SWIFT™ Documentation, See the TI  
Website at http://www.ti.com/swift  
•
•
•
•
•
•
•
Adjustable UVLO Voltage and Hysteresis  
116 μA Operating Quiescent Current  
1.3 μA Shutdown Current  
APPLICATIONS  
•
12-V and 24-V Industrial and Commercial Low  
Power Systems  
100 kHz to 2.5 MHz Switching Frequency  
Synchronizes to External Clock  
Adjustable Slow Start/Sequencing  
UV and OV Power Good Output  
•
Aftermarket Auto Accessories: Video, GPS,  
Entertainment  
DESCRIPTION  
The TPS54040A device is a 42 V, 0.5 A, step down regulator with an integrated high side MOSFET. Current  
mode control provides simple external compensation and flexible component selection. A low ripple pulse skip  
mode reduces the no load, regulated input supply current to 116 μA. Using the enable pin, shutdown supply  
current is nominally 1.3 μA when the enable pin is low.  
Under voltage lockout is internally set at 2.5 V, but can be increased using the enable pin. The output voltage  
startup ramp is controlled by the slow start pin that can also be configured for sequencing or tracking. An open  
drain power good signal indicates when the output is within 94% to 107% of its nominal voltage.  
A wide switching frequency range allows efficiency and external component size to be optimized. Frequency fold  
back and thermal shutdown protects the part during an overload condition.  
SPACER  
SIMPLIFIED SCHEMATIC  
EFFICIENCY  
vs  
LOAD CURRENT  
VIN  
PWRGD  
VIN  
TPS54040A  
100  
90  
BOOT  
PH  
EN  
80  
VOUT  
SS/TR  
RT/CLK  
COMP  
70  
60  
50  
40  
VSENSE  
GND  
30  
20  
VI = 12 V,  
VO = 5.0 V,  
fsw = 700 kHz  
10  
0
0
0.1  
0.2  
0.3  
0.4  
0.5  
Load Current - A  
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.  
Eco-Mode, SwitcherPro, SWIFT are trademarks of Texas Instruments.  
2
3
WEBENCH is a registered trademark 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 © 2012, Texas Instruments Incorporated  
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