www.ti.com
SLVS351I – SEPTEMBER 2002 – REVISED MAY 2006
ULTRALOW-NOISE, HIGH PSRR, FAST, RF, 1A
LOW-DROPOUT LINEAR REGULATORS
FEATURES
•
•
•
•
•
•
•
•
•
1A Low-Dropout Regulator With Enable
Available in Fixed and Adjustable (1.2V to
5.5V) Versions
High PSRR (53dB at 10kHz)
Ultralow-Noise (40µV
RMS
, TPS79630)
Fast Start-Up Time (50µs)
Stable With a 1µF Ceramic Capacitor
Excellent Load/Line Transient Response
Very Low Dropout Voltage (250mV at Full
Load, TPS79630)
3
×
3 SON, SOT223-6, and
DDPAK-5 Packages
DESCRIPTION
The TPS796xx family of low-dropout (LDO)
low-power 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, 3
×
3 SON, SOT223-6,
and DDPAK-5 packages. Each device in the family is
stable with a small 1µF ceramic capacitor on the
output. The family uses an advanced, proprietary
BiCMOS fabrication process to yield extremely low
dropout voltages (e.g., 250mV at 1A). Each device
achieves fast start-up times (approximately 50µs with
a 0.001µF bypass capacitor) while consuming very
low quiescent current (265
µA
typical). Moreover,
when the device is placed in standby mode, the
supply current is reduced to less than 1µA. The
TPS79630 exhibits approximately 40µV
RMS
of output
voltage noise at 3.0V output, with a 0.1µF bypass
capacitor. Applications with analog components that
are noise sensitive, such as portable RF electronics,
benefit from the high PSRR, low noise features, and
the fast response time.
APPLICATIONS
•
•
•
•
•
RF: VCOs, Receivers, ADCs
Audio
Bluetooth™, Wireless LAN
Cellular and Cordless Telephones
Handheld Organizers, PDAs
DRB PACKAGE
3mm x 3mm SON
(TOP VIEW)
DCQ PACKAGE
SOT223-6
(TOP VIEW)
IN 1
IN 2
OUT 3
OUT 4
8 EN
7 NC
6 GND
5 NR
Ripple Rejection − dB
TPS79630
TPS79630
RIPPLE REJECTION
vs
FREQUENCY
80
70
60
50
40
30
20
10
0
1
10
100
1k
10k 100k
1M
10M
I
OUT
= 1 mA
Output Spectral Noise Density − µV/√Hz
V
IN
= 4 V
C
OUT
= 10
µF
C
NR
= 0.01
µF
OUTPUT SPECTRAL NOISE DENSITY
vs
FREQUENCY
0.7
0.6
0.5
0.4
0.3
I
OUT
= 1 mA
0.2
0.1
I
OUT
= 1.5 A
0.0
100
1k
10k
100k
V
IN
= 5.5 V
C
OUT
= 2.2
µF
C
NR
= 0.1
µF
EN
IN
GND
OUT
NR/FB
1
2
3
4
5
6
GND
I
OUT
= 1 A
KTT (DDPAK) PACKAGE
(TOP VIEW)
EN
IN
GND
OUT
NR/FB
1
2
3
4
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.
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 © 2002–2006, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
