TPS795XX Datasheet, PDF (1/23 Pages) Texas Instruments – ULTRALOW-NOISE, HIGH-PSRR, FAST, RF, 500-mA LOW-DROPOUT LINEAR REGULATORS

TPS795xx
www.ti.com
SLVS350G – OCTOBER 2002 – REVISED JULY 2006
ULTRALOW-NOISE, HIGH-PSRR, FAST, RF, 500-mA
LOW-DROPOUT LINEAR REGULATORS
FEATURES
• 500-mA Low-Dropout Regulator With Enable
• Available in Fixed and Adjustable (1.2-V to
5.5-V) Versions
• High PSRR (50 dB at 10 kHz)
• Ultralow Noise (33 µV_RMS, TPS79530)
• Fast Start-Up Time (50 µs)
• Stable With a 1-µF Ceramic Capacitor
• Excellent Load/Line Transient Response
• Very Low Dropout Voltage (110 mV at Full
Load, TPS79530)
• 6-Pin SOT223 and 3 × 3 SON Packages
APPLICATIONS
• RF: VCOs, Receivers, ADCs
• Audio
• Bluetooth^®, Wireless LAN
• Cellular and Cordless Telephones
• Handheld Organizers, PDAs
DESCRIPTION
The TPS795xx 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, SOT223-6 and 3 x 3 SON
packages. Each device in the family is stable with a
small 1-µF ceramic capacitor on the output. The
family uses an advanced, proprietary BiCMOS
fabrication process to yield extremely low dropout
voltages (for example, 110 mV at 500 mA). Each
device achieves fast start-up times (approximately 50
µs with a 0.001-µF 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 1 µA. The TPS79530 exhibits approximately 33
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
and low-noise features, as well as from the fast
response time.
DRB PACKAGE
3mm x 3mm SON
(TOP VIEW)
IN 1
IN 2
DCQ PACKAGE ^{OUT 3}
SOT223-6 ^{OUT 4}
(TOP VIEW)
8 EN
7 NC
6 GND
5 NR/FB
EN
1
IN
2
GND
3
OUT
4
NR/FB
5
6
GND
TPS79530
RIPPLE REJECTION
vs
FREQUENCY
80
V_IN = 4 V
70 COUT = 10 mF
C_NR = 0.01 mF
60
I_OUT = 1 mA
50
40
I_OUT = 500 mA
30
20
10
0
1 10 100 1 k 10 k 100 k 1 M 10 M
Frequency (Hz)
TPS79530
OUTPUT SPECTRAL NOISE DENSITY
vs
FREQUENCY
0.5
V_IN = 5.5 V
C_OUT = 2.2 mF
0.4
C_NR = 0.1 mF
0.3
I_OUT = 1 mA
0.2
I_OUT = 0.5 A
0.1
0
100
1k
10 k
Frequency (Hz)
100 k
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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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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