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TPS720XX_0809

更新时间： 2024-11-23 04:48:39
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德州仪器 - TI 稳压器射频
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22页 926K
描述
350mA, Ultra-Low VIN, RF Low-Dropout Linear Regulator with Bias Pin

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TPS720XX_0809 数据手册

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TPS720xx  
www.ti.com ................................................................................................................................................ SBVS100C–JUNE 2008–REVISED SEPTEMBER 2008  
350mA, Ultra-Low V , RF Low-Dropout Linear Regulator with Bias Pin  
IN  
1
FEATURES  
DESCRIPTION  
2
•
350mA High-Performance LDO  
The TPS720xx family of dual rail, low-dropout linear  
regulators (LDOs) offers outstanding ac performance  
(PSRR, load and line transient response), while  
consuming a very low quiescent current of 38µA.  
•
•
Low Quiescent Current: 38µA  
Excellent Load Transient Response:  
±15mV for ILOAD = 0mA to 350mA in 1µs  
The VBIAS rail that powers the control circuit of the  
LDO draws very low current (on the order of the  
quiescent current of the LDO) and can be connected  
to any power supply that is equal to or greater than  
1.4V above the output voltage. The main power path  
is through VIN, which can be a lower voltage than  
VBIAS; it can be as low as VOUT + VDO, increasing the  
efficiency of the solution in many power-sensitive  
applications. For example, VIN can be an output of a  
high-efficiency, dc-dc step-down regulator.  
•
Excellent Line Transient Response:  
ΔVOUT = ±2mV for ΔVBIAS = ±600mV in 1µs  
ΔVOUT = ±200µV for ΔVIN = ±400mV in 1µs  
•
•
•
•
•
Low Noise: 48µVRMS (10Hz to 100kHz)  
80dB VIN PSRR (10Hz to 10kHz)  
70dB VBIAS PSRR (10Hz to 10kHz)  
Fast Start-Up Time: 140µs  
Built-In Soft-Start with Monotonic VOUT Rise  
and Startup Current Limited to 100mA + ILOAD  
The TPS720xx supports a novel feature in which the  
output of the LDO regulates under light loads when  
the IN pin is left floating. The light-load drive current  
is sourced from VBIAS under this condition. This  
feature is particularly useful in power-saving  
applications where the dc/dc converter connected to  
the IN pin is disabled but the LDO is still required to  
regulate the voltage to a light load.  
•
•
•
•
Over-Current and Thermal Protection  
Low Dropout: 110mV at ILOAD = 350mA  
Stable with 2.2µF Output Capacitor  
Available in 1,33mm x 0,96mm WCSP-5 and  
2mm x 2mm SON-6 Packages  
APPLICATIONS  
The TPS720xx is stable with ceramic capacitors and  
uses an advanced BICMOS fabrication process that  
yields a dropout of 110mV at a 350mA output load.  
The TPS720xx has the unique feature of providing a  
monotonic VOUT rise (overshoot limited to 3%) with  
VIN inrush current limited to 100mA + ILOAD with an  
output capacitor of 2.2µF.  
•
•
•
•
Digital Cameras  
Cellular Camera Phones  
Wireless LAN  
Handheld Products  
TPS720xx  
DRV PACKAGE  
2mm x 2mm SON-6  
(TOP VIEW)  
The TPS720xx uses a precision voltage reference  
and feedback loop to achieve overall accuracy of 2%  
over load, line, process, and temperature extremes.  
An ultra-small wafer chip-scale package (WCSP)  
makes the TPS720xx ideal for handheld applications.  
The TPS720xx is also available in a SON-8 package.  
This family of devices is fully specified over the  
temperature range of TJ = –40°C to +125°C.  
OUT  
NC  
1
2
3
6
5
4
IN  
Thermal  
Pad  
GND  
BIAS  
EN  
TPS720xx  
YZU PACKAGE  
VBATT  
1,33mm x 0,96mm WCSP-5  
(TOP VIEW)  
C3  
A3  
C1  
A1  
BIAS  
EN  
GND  
OUT  
BIAS  
1.8V  
1.3V  
Standalone  
dc/dc  
VCORE  
IN  
OUT  
B2  
TPS720xx  
Converter  
or PMU  
2.2mF  
Ceramic  
EN  
GND  
IN  
VEN  
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 © 2008, Texas Instruments Incorporated  
1234567...22

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