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TPS79418_15

更新时间： 2024-11-15 01:04:11
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德州仪器 - TI /
页数 文件大小 规格书
23页 1063K
描述
ULTRALOW-NOISE, HIGH-PSRR, FAST, RF, 250-mA LOW-DROPOUT LINEAR REGULATORS

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TPS79418_15 数据手册

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TPS794xx  
www.ti.com  
SLVS349E–NOVEMBER 2001–REVISED DECEMBER 2005  
ULTRALOW-NOISE, HIGH-PSRR, FAST, RF, 250-mA  
LOW-DROPOUT LINEAR REGULATORS  
FEATURES  
DESCRIPTION  
•
250-mA Low-Dropout Regulator With Enable  
The TPS794xx family of low-dropout (LDO) linear  
voltage regulators features high power-supply  
rejection ratio (PSRR), ultralow-noise, fast start-up,  
and excellent line and load transient responses in  
small outline, MSOP-8 PowerPAD™ and SOT223-6  
packages. Each device in the family is stable with a  
small 2.2-µF ceramic capacitor on the output. The  
family uses an advanced, proprietary BiCMOS  
fabrication process to yield extremely low dropout  
voltages (for example, 155 mV at 250 mA). Each  
device achieves fast start-up times (approximately  
50 µs with a 0.001-µF bypass capacitor) while  
consuming low quiescent current (170 µA typical).  
Moreover, when the device is placed in standby  
mode, the supply current is reduced to less than  
•
Available in Fixed and Adjustable (1.2 V to  
5.5 V) Versions  
•
•
•
•
•
•
High PSRR (60 dB at 10 kHz)  
Ultralow Noise (32 µVrms, TPS79428)  
Fast Start-Up Time (50 µs)  
Stable With a 2.2-µF Ceramic Capacitor  
Excellent Load/Line Transient Response  
Very Low Dropout Voltage (155 mV at Full  
Load)  
•
Available in MSOP-8 and SOT223-6 Packages  
APPLICATIONS  
1
µA. The TPS79428 exhibits approximately  
•
•
•
•
•
RF: VCOs, Receivers, ADCs  
Audio  
Bluetooth™, Wireless LAN  
Cellular and Cordless Telephones  
Handheld Organizers, PDAs  
32 µVRMS of output voltage noise at 2.8 V output with  
a 0.1-µF bypass capacitor. Applications with analog  
components that are noise-sensitive, such as  
portable RF electronics, benefit from the high PSRR  
and low noise features as well as the fast response  
time.  
DGN PACKAGE  
MSOP-8 PowerPADt  
TPS79433  
TPS79428  
RIPPLE REJECTION  
vs  
OUTPUT SPECTRAL NOISE DENSITY  
(TOP VIEW)  
vs  
1
2
3
4
OUT  
NC  
FB  
8
7
6
5
IN  
NC  
EN  
FREQUENCY  
FREQUENCY  
90  
0.35  
0.30  
C
C
= 2.2 µF,  
OUT  
= 0.1 µF,  
80  
70  
NR  
GND  
NR  
= 3.8 V  
I
= 10 mA  
OUT  
V
IN  
NC − No internal connection  
I
= 250 mA  
OUT  
0.25  
0.20  
60  
50  
40  
30  
20  
10  
0
I
= 250 mA  
DCQ PACKAGE  
SOT223-6  
(TOP VIEW)  
OUT  
0.15  
0.10  
V
V
C
C
C
= 4.3 V,  
1
IN  
EN  
IN  
= 3.3 V,  
= 1 µF,  
= 10 µF,  
OUT  
2
IN  
I
= 1 mA  
OUT  
6
0.05  
0
3
4
GND  
OUT  
OUT  
GND  
= 0.01 µF  
NR  
100  
1000  
10000  
100000  
10  
100  
1 k  
10 k 100 k 1 M 10 M  
5
NR/FB  
Frequency (Hz)  
Frequency (Hz)  
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.  
PowerPAD is a trademark of Texas Instruments.  
Bluetooth is a trademark of Bluetooth SIG, Inc.  
All other 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 © 2001–2005, Texas Instruments Incorporated  
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