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TPS744

更新时间： 2024-11-10 01:10:51
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德州仪器 - TI /
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3.0A Ultra-LDO with Programmable Soft-Start

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TPS744xx  
www.ti.com  
SBVS066O –DECEMBER 2005–REVISED MARCH 2013  
3.0A Ultra-LDO with Programmable Soft-Start  
Check for Samples: TPS744xx  
1
FEATURES  
DESCRIPTION  
2
•
•
•
Soft-Start (SS) Pin Provides a Linear Startup  
with Ramp Time Set by External Capacitor  
The TPS744xx low-dropout (LDO) linear regulators  
provide an easy-to-use robust power management  
solution for a wide variety of applications. User-  
programmable soft-start minimizes stress on the input  
power source by reducing capacitive inrush current  
on start-up. The soft-start is monotonic and well-  
suited for powering many different types of  
processors and ASICs. The enable input and power-  
good output allow easy sequencing with external  
regulators. This complete flexibility permits the user to  
configure a solution that will meet the sequencing  
requirements of FPGAs, DSPs, and other  
applications with specific start-up requirements.  
1% Accuracy Over Line, Load, and  
Temperature  
Supports Input Voltages as Low as 0.9V with  
External Bias Supply  
•
•
•
•
•
•
Adjustable Output (0.8V to 3.6V)  
Fixed Output (0.9V to 3.6V)  
Ultra-Low Dropout: 115mV at 3.0A (typ)  
Stable with Any or No Output Capacitor  
Excellent Transient Response  
Available in 5mm × 5mm × 1mm QFN and  
DDPAK-7 Packages  
A precision reference and error amplifier deliver 1%  
accuracy over load, line, temperature, and process.  
Each LDO is stable with low-cost ceramic output  
capacitors and the device family is fully specified from  
–40°C to +125°C. The TPS744xx is offered in a small  
(5mm × 5mm) QFN package, yielding a highly  
compact total solution size. For applications that  
require additional power dissipation, the DDPAK  
(KTW) package is also available.  
•
•
Open-Drain Power-Good (QFN only)  
Active High Enable  
APPLICATIONS  
•
•
•
•
FPGA Applications  
DSP Core and I/O Voltages  
Post-Regulation Applications  
space  
Applications with Special Start-Up Time or  
Sequencing Requirements  
ADJUSTABLE VOLTAGE VERSION  
VIN  
VPG  
IN  
PG  
•
Hot-Swap and Inrush Controls  
space  
CIN  
1mF  
R3  
R1  
EN  
BIAS  
SS  
VOUT  
OUT  
TPS74401  
VBIAS  
COUT  
CBIAS  
1mF  
FB  
GND  
CSS  
R2  
CSS = 0mF  
VOUT  
Optional  
CSS = 0.001mF  
CSS = 0.0047mF  
FIXED VOLTAGE VERSION  
500mV/div  
VIN  
VPG  
IN  
PG  
CIN  
1mF  
R3  
EN  
VOUT  
OUT  
TPS744xx  
BIAS  
SS  
1.1V  
VEN  
VBIAS  
COUT  
1V/div  
0V  
CBIAS  
1mF  
SNS  
GND  
CSS  
Time (1ms/div)  
Optional  
Figure 1. Turn-On Response  
Figure 2. Typical Application Circuits  
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
All 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 © 2005–2013, Texas Instruments Incorporated  
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