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TPS79401

更新时间： 2024-11-13 22:52:47
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德州仪器 - TI 稳压器射频
页数 文件大小 规格书
15页 478K
描述
ULTRALOW-NOISE, HIGH PSRR, FAST RF 250-mA LOW-DROPOUT LINEAR REGULATORS

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TPS79401 数据手册

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TPS79401, TPS79418  
TPS79425, TPS79428  
TPS79430, TPS79433  
www.ti.com  
SLVS349D–NOVEMBER 2001–REVISED OCTOBER 2004  
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 rejec-  
tion ratio (PSRR), ultralow-noise, fast start-up, and  
excellent line and load transient responses in small  
outline, MSOP-8 PowerPAD™ and SOT223-6 pack-  
ages. 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 (e.g.,  
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 1 µA. The TPS79428 exhibits  
approximately 32 µVRMS of output voltage noise at  
2.8 V output with a 0.1-µF bypass capacitor. Appli-  
•
Available in 1.8 V, 2.5 V, 2.8 V, 3 V, 3.3 V, and  
Adjustable (1.2 V to 5.5 V)  
•
•
•
•
•
•
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  
•
•
•
•
•
RF: VCOs, Receivers, ADCs  
Audio  
Bluetooth™, Wireless LAN  
Cellular and Cordless Telephones  
Handheld Organizers, PDAs  
cations 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 PowerPAD  
(TOP VIEW)  
TPS79433  
TPS79428  
RIPPLE REJECTION  
vs  
OUTPUT SPECTRAL NOISE DENSITY  
vs  
OUT  
NC  
FB  
IN  
NC  
EN  
1
2
3
4
8
7
6
5
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  
OUT  
DCQ PACKAGE  
SOT223-6  
(TOP VIEW)  
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  
NR  
OUT  
GND  
= 0.01 µF  
NR  
100  
1000  
10000  
100000  
10  
100  
1 k  
10 k 100 k 1 M 10 M  
5
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.  
Bluetooth is a trademark of Bluetooth SIG, Inc.  
PowerPAD is a trademark of Texas Instruments.  
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 © 2001–2004, Texas Instruments Incorporated  
1234567...15

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