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TPS54478

更新时间： 2024-11-30 08:38:59
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德州仪器 - TI /
页数 文件大小 规格书
37页 1442K
描述
2.95-V to 6-V Input, 4-A Output, 2-MHz, Synchronous Step-Down

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TPS54478 数据手册

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TPS54478  
www.ti.com  
SLVSAS2 –JUNE 2011  
2.95-V to 6-V Input, 4-A Output, 2-MHz, Synchronous Step-Down  
Switcher With Integrated FETs ( SWIFT™)  
Check for Samples: TPS54478  
1
FEATURES  
DESCRIPTION  
The TPS54478 device is a full featured 6 V, 4 A,  
synchronous step down current mode converter with  
two integrated MOSFETs.  
2
•
Two 30-mΩ (typical) MOSFETs for High  
Efficiency at 4 A Loads  
200kHz to 2MHz Switching Frequency  
0.6 V ± 1% Voltage Reference Over  
Temperature (–40°C to 150°C)  
Start up with Pre-Biased Voltage  
Synchronizes to External Clock  
Adjustable Slow Start / Sequencing  
UV and OV Power Good Output  
Cycle by Cycle Current Limit and Hiccup  
Current Protection  
•
•
The TPS54478 enables small designs by integrating  
the MOSFETs, implementing current mode control to  
reduce external component count, reducing inductor  
size by enabling up to 2 MHz switching frequency,  
and minimizing the IC footprint with a small 3mm x  
3mm thermally enhanced QFN package.  
•
•
•
•
•
The TPS54478 provides accurate regulation for a  
variety of loads with an accurate ±1% Voltage  
Reference (VREF) over temperature.  
•
•
Thermally Enhanced 3mm × 3mm 16-pin QFN  
(RTE)  
Pin Compatible to TPS54418  
Efficiency is maximized through the integrated 30mΩ  
MOSFETs and 525μA typical supply current. Using  
the enable pin, shutdown supply current is reduced to  
2.5µA by entering a shutdown mode.  
APPLICATIONS  
•
•
Under voltage lockout is internally set at 2.6 V, but  
can be increased by programming the threshold with  
a resistor network on the enable pin. The output  
voltage startup ramp is controlled by the slow start  
pin. An open drain power good signal indicates the  
output is within 93% to 107% of its nominal voltage.  
Low-Voltage, High-Density Power Systems  
Point of Load Regulation for High Performance  
DSPs, FPGAs, ASICs and Microprocessors  
Broadband, Networking and Optical  
Communications Infrastructure  
•
Cycle-by-cycle current limit, hiccup overcuurent  
protection and thermal shutdown protect the device  
during an overcurrent condition.  
SIMPLIFIED SCHEMATIC  
vertical spacer  
The TPS54478 is supported in the SwitcherPro™  
Software Tool at www.ti.com/switcherpro.  
For more SWIFTTM documentation, see the TI  
website at www.ti.com/swift.  
vertical spacer  
VIN  
C
BOOT  
VIN  
BOOT  
TPS54478  
C
I
R
R
4
5
L
O
VOUT  
EN  
95  
PH  
C
O
90  
R
1
2
PWRGD  
V
= 5 V  
85  
80  
75  
70  
65  
60  
IN  
VSENSE  
V
= 3.3 V  
IN  
R
SS/TR  
RT /CLK  
COMP  
GND  
AGND  
C
POWERPAD  
ss  
R
R
T
3
C
F
= 1 MHz,  
1
S
DCR = 6.8 mW,  
= 1.8 V  
55  
50  
V
O
0
0.5  
1
1.5  
2
2.5  
3
3.5  
4
I
- Output Current - A  
O
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
SWIFT, SwitcherPro 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 © 2011, Texas Instruments Incorporated  
1234567...37

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TPS54478 替代型号

型号 品牌 替代类型 描述 数据表
TPS54319 TI

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 2.95-V to 6-V Input, 3-A Output, 2-MHz, Synch
TPS54318 TI

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TPS54519 TI

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 2.95 V to 6 V Input, 5-A Synchronous Step Down SWIFT Converter

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