TPS79601 Datasheet, PDF (1/18 Pages) Texas Instruments – ULTRALOW-NOISE, HIGH PSRR, FAST RF 1-A LOW-DROPOUT LINEAR REGULATORS

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TPS79601, TPS79618, TPS79625
TPS79628, TPS79630, TPS79633
SLVS351D – SEPTEMBER 2002 – REVISED OCTOBER 2004
ULTRALOW-NOISE, HIGH PSRR, FAST RF 1-A
LOW-DROPOUT LINEAR REGULATORS
FEATURES
• 1-A Low-Dropout Regulator With Enable
• 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 (53 dB at 10 kHz)
• Ultralow-Noise (40 µV_RMS, TPS79630)
• Fast Start-Up Time (50 µs)
• Stable With a 1-µF Ceramic Capacitor
• Excellent Load/Line Transient Response
• Very Low Dropout Voltage (250 mV at Full
Load, TPS79630)
• 3 x 3 SON, 6-Pin SOT223-6, and
5-Pin DDPAK 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 x 3 SON, SOT223-6,
and 5-pin DDPAK packages. Each device in the
family is stable with a small 1-µF ceramic capacitor
on the output. The family uses an advanced, pro-
prietary BiCMOS fabrication process to yield ex-
tremely low dropout voltages (e.g., 250 mV at 1 A).
Each device achieves fast start-up times
(approximately 50 µs with a 0.001-µF bypass capaci-
tor) 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 1 µA. The TPS79630 exhibits approximately
40 µV_RMS of output voltage noise at 3.0-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, low
noise features, and the fast response time.
DCQ PACKAGE
SOT223-6
(TOP VIEW)
EN
1
IN
2
GND
3
OUT
4
NR/FB
5
6
GND
DRB PACKAGE
3 x 3 SON
(TOP VIEW)
IN 1
IN 2
OUT 3
OUT 4
8 EN
7 NC
6 GND
5 NR
EN
IN
GND
OUT
NR/FB
KTT (DDPAK) PACKAGE
(TOP VIEW)
1
2
3
4
5
TPS79630
RIPPLE REJECTION
vs
FREQUENCY
80
70
V_IN = 4 V
C_OUT = 10 µF
60
I_OUT = 1 mA
C_NR = 0.01 µF
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 µF
C_NR = 0.1 µF
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
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 © 2002–2004, Texas Instruments Incorporated