TPS796XX_08 Datasheet, PDF (1/25 Pages) Texas Instruments – ULTRALOW-NOISE, HIGH PSRR, FAST, RF, 1A LOW-DROPOUT LINEAR REGULATORS

TPS796xx
www.ti.com
SLVS351K – SEPTEMBER 2002 – REVISED FEBRUARY 2008
ULTRALOW-NOISE, HIGH PSRR, FAST, RF, 1A
LOW-DROPOUT LINEAR REGULATORS
FEATURES
1
•234 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 PowerPAD™, SOT223-6, and
DDPAK-5 Packages
APPLICATIONS
• RF: VCOs, Receivers, ADCs
• Audio
• Bluetooth™, Wireless LAN
• Cellular and Cordless Telephones
• Handheld Organizers, PDAs
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 (for example, 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.
EN
IN
GND
OUT
NR/FB
DRB PACKAGE
3mm x 3mm SON
(TOP VIEW)
DQC PACKAGE
SOT223-6
(TOP VIEW)
IN 1
IN 2
8 EN
7 NC
OUT 3
6 GND
1
OUT 4
5 NR/FB
2
6
3
4
GND
5
KTT (DDPAK) PACKAGE
(TOP VIEW)
EN
1
IN
2
GND
3
OUT
4
NR/FB
5
TPS79630
RIPPLE REJECTION
vs
FREQUENCY
80
V_IN = 4 V
70
C_OUT = 10 mF
60
I_OUT = 1 mA
C_NR = 0.01 mF
50
I_OUT = 1 A
40
30
20
10
0
1 10 100 1k 10k 100k 1M 10M
Frequency (Hz)
TPS79630
OUTPUT SPECTRAL NOISE DENSITY
vs
FREQUENCY
0.7
V_IN = 5.5 V
0.6 C_OUT = 2.2 mF
C_NR = 0.1 mF
0.5
0.4
0.3
I_OUT = 1 mA
0.2
0.1
0.0
100
I_OUT = 1.5 A
1k
10k
Frequency (Hz)
100k
1
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 Inc.
2
Bluetooth is a trademark of Bluetooth SIG, Inc.
3
All other trademarks are the property of their respective owners.
4
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 © 2002–2008, Texas Instruments Incorporated