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TPS79401DCQ Fiches technique(PDF) 1 Page - Texas Instruments

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No de pièce TPS79401DCQ
Description  ULTRALOW-NOISE, HIGH PSRR, FAST RF 250-mA LOW-DROPOUT LINEAR REGULATORS
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS79401DCQ Fiches technique(HTML) 1 Page - Texas Instruments

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FEATURES
DESCRIPTION
APPLICATIONS
OUT
NC − No internal connection
1
2
3
4
5
DCQ PACKAGE
NR
OUT
GND
IN
EN
2
1
3
4
7
8
6
5
NC
FB
NR
IN
NC
EN
GND
SOT223-6
(TOP VIEW)
DGN PACKAGE
MSOP PowerPAD
(TOP VIEW)
IOUT = 10 mA
IOUT = 250 mA
VIN = 4.3 V,
VOUT = 3.3 V,
CIN = 1 µF,
COUT = 10 µF,
CNR = 0.01 µF
40
20
10
10
100
1 k
10 k
60
70
Frequency (Hz)
TPS79433
RIPPLE REJECTION
vs
FREQUENCY
90
100 k
1 M
10 M
0
30
50
80
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
IOUT = 250 mA
IOUT = 1 mA
COUT = 2.2 µF,
CNR = 0.1 µF,
VIN = 3.8 V
TPS79428
OUTPUT SPECTRAL NOISE DENSITY
vs
FREQUENCY
Frequency (Hz)
100
1000
10000
100000
6
GND
TPS79401, TPS79418
TPS79425, TPS79428
TPS79430, TPS79433
SLVS349D – NOVEMBER 2001 – REVISED OCTOBER 2004
ULTRALOW-NOISE, HIGH PSRR, FAST RF 250-mA LOW-DROPOUT LINEAR
REGULATORS
250-mA Low-Dropout Regulator With Enable
The TPS794xx family of low-dropout (LDO) linear
voltage regulators features high power-supply rejec-
Available in 1.8 V, 2.5 V, 2.8 V, 3 V, 3.3 V, and
tion ratio (PSRR), ultralow-noise, fast start-up, and
Adjustable (1.2 V to 5.5 V)
excellent line and load transient responses in small
High PSRR (60 dB at 10 kHz)
outline, MSOP-8 PowerPAD™ and SOT223-6 pack-
Ultralow Noise (32 µVrms, TPS79428)
ages. Each device in the family is stable with a small
2.2-µF ceramic capacitor on the output. The family
Fast Start-Up Time (50 µs)
uses an advanced, proprietary BiCMOS fabrication
Stable With a 2.2-µF Ceramic Capacitor
process to yield extremely low dropout voltages (e.g.,
Excellent Load/Line Transient Response
155 mV at 250 mA). Each device achieves fast
start-up times (approximately 50 µs with a 0.001-µF
Very Low Dropout Voltage (155 mV at Full
bypass capacitor) while consuming low quiescent
Load)
current (170 µA typical). Moreover, when the device
Available in MSOP-8 and SOT223-6 Packages
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
RF: VCOs, Receivers, ADCs
2.8 V output with a 0.1-µF bypass capacitor. Appli-
cations
with
analog
components
that
are
Audio
noise-sensitive, such as portable RF electronics,
Bluetooth™, Wireless LAN
benefit from the high PSRR and low noise features as
Cellular and Cordless Telephones
well as the fast response time.
Handheld Organizers, PDAs
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.
Copyright © 2001–2004, 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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