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TPS749XX

更新时间： 2024-11-23 03:01:15
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27页 837K
描述
3.0A Low Dropout Linear Regulator with Programmable Soft-Start

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TPS749XX 数据手册

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TPS749xx  
www.ti.com  
SBVS082A–JUNE 2007–REVISED JULY 2007  
3.0A Low Dropout Linear Regulator with Programmable Soft-Start  
FEATURES  
DESCRIPTION  
•
•
•
•
Ultra-Low VIN and VOUT Range: 0.8V to 5.5V  
The TPS749xx low-dropout (LDO) linear regulator  
provides an easy-to-use robust power management  
VBIAS Range: 2.7V to 5.5V  
Low Dropout: 120mV (typ) at 3.0A, VBIAS = 5V  
solution for  
a
wide variety of applications.  
Power-Good (PG) Output Allows Supply  
Monitoring or Provides a Sequencing Signal  
for Other Supplies  
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 meets the  
sequencing requirements of FPGAs, DSPs, and  
other applications with special start-up requirements.  
•
•
2% Accuracy Over Line/Load/Temperature  
Programmable Soft-Start Provides Linear  
Voltage Startup  
•
VBIAS Permits Low VIN Operation with Good  
Transient Response  
•
•
Stable with Any Output Capacitor ≥ 2.2μF  
A precision reference and error amplifier deliver 2%  
accuracy over load, line, temperature, and process.  
The device is stable with any type of capacitor ≥  
2.2μF, and the device is fully specified from –40°C to  
+125°C. The TPS749xx is offered in a small (5mm ×  
5mm) QFN package, yielding a highly compact total  
solution size. It is also available in a DDPAK-7.  
Available in 5mm × 5mm × 1mm QFN and  
DDPAK-7 Packages  
•
•
Open-Drain Power-Good  
Active High Enable  
APPLICATIONS  
•
•
•
•
FPGA Applications  
DSP Core and I/O Voltages  
Post-Regulation Applications  
Applications with Special Start-Up Time or  
Sequencing Requirements  
CSS = 0mF  
•
Hot-Swap and Inrush Controls  
VOUT  
CSS = 0.001mF  
CSS = 0.0047mF  
1V/div  
VIN  
IN  
PG  
R3  
R1  
CIN  
BIAS  
EN  
SS  
VOUT  
OUT  
TPS74901  
1.2V  
VEN  
VBIAS  
COUT  
1V/div  
0V  
FB  
GND  
CBIAS  
CSS  
R2  
Time (1ms/div)  
Figure 1. Typical Application Circuit (Adjustable)  
Figure 2. Turn-On Response  
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.  
All trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Copyright © 2007, Texas Instruments Incorporated  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
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