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TPS79401DCQR Datasheet Preview

TPS79401DCQR Datasheet

LOW-DROPOUT LINEAR REGULATOR

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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
250-mA Low-Dropout Regulator With Enable
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
RF: VCOs, Receivers, ADCs
Audio
Bluetooth™, Wireless LAN
Cellular and Cordless Telephones
Handheld Organizers, PDAs
DESCRIPTION
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
1 µA. The TPS79428 exhibits approximately
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
(TOP VIEW)
OUT
1
NC
2
FB
3
NR
4
8
IN
7
NC
6
EN
5
GND
NC − No internal connection
DCQ PACKAGE
SOT223-6
(TOP VIEW)
EN
1
IN
2
GND
3
OUT
4
NR/FB
5
6
GND
TPS79433
RIPPLE REJECTION
vs
FREQUENCY
90
80
IOUT = 10 mA
70
IOUT = 250 mA
60
50
40
30
VIN = 4.3 V,
20
VOUT = 3.3 V,
CIN = 1 µF,
10
COUT = 10 µF,
CNR = 0.01 µF
0
10 100 1 k 10 k 100 k 1 M 10 M
Frequency (Hz)
TPS79428
OUTPUT SPECTRAL NOISE DENSITY
vs
FREQUENCY
0.35
0.30
COUT = 2.2 µF,
CNR = 0.1 µF,
VIN = 3.8 V
0.25
0.20
IOUT = 250 mA
0.15
0.10
0.05
0
100
IOUT = 1 mA
1000
10000
Frequency (Hz)
100000
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




etcTI

TPS79401DCQR Datasheet Preview

TPS79401DCQR Datasheet

LOW-DROPOUT LINEAR REGULATOR

No Preview Available !

TPS794xx
SLVS349E – NOVEMBER 2001 – REVISED DECEMBER 2005
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be
more susceptible to damage because very small parametric changes could cause the device not to meet its published
specifications.
ORDERING INFORMATION(1)
PRODUCT
TPS794xxyyyz
VOUT (2)
XX is nominal output voltage (for example, 28 = 2.8 V, 285 = 2.85 V, 01 = Adjustable).
YYY is package designator.
Z is package quantity.
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
website at www.ti.com.
(2) Output voltages from 1.3 V to 5.0 V in 100 mV increments are available; minimum order quantities may apply. Contact factory for details
and availability.
ABSOLUTE MAXIMUM RATINGS
over operating temperature range unless otherwise noted(1)
VIN range
VEN range
VOUT range
Peak output current
ESD rating, HBM
ESD rating, CDM
Continuous total power dissipation
Junction temperature range, TJ
Storage temperature range, Tstg
VALUE
–0.3 V to 6 V
–0.3 V to VIN + 0.3 V
–0.3 V to 6 V
Internally limited
2 kV
500 V
See Dissipation Ratings Table
–40°C to +150°C
–65°C to +150°C
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
PACKAGE DISSIPATION RATINGS
PACKAGE
DGN
AIR FLOW
(CFM)
0
150
250
RθJC
(°C/W)
8.47
8.21
8.20
RθJA
(°C/W)
55.09
49.97
48.10
TA25°C
POWER RATING
2.27 W
2.50 W
2.60 W
TA = 70°C
POWER RATING
1.45 W
1.60 W
1.66 W
TA = 85°C
POWER RATING
1.18 W
1.30 W
1.35 W
6
5
4
Condition 1
3
Condition 2
2
CONDITIONS PACKAGE
1
SOT223
2
SOT223
PCB AREA
4in2 Top Side Only
0.5in2 Top Side Only
1
0
0 25 50 75 100 125 150
TA (°C)
Figure 1. SOT223 Power Dissipation
θJA
53°C/W
110°C/W
2
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Part Number TPS79401DCQR
Description LOW-DROPOUT LINEAR REGULATOR
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