TPS786XX Datasheet, PDF (1/21 Pages) Texas Instruments – ULTRALOW-NOISE, HIGH-PSRR, FAST, RF, 1.5-A LOW-DROPOUT LINEAR REGULATORS

TPS786xx
www.ti.com
SLVS389G – SEPTEMBER 2002 – REVISED JULY 2006
ULTRALOW-NOISE, HIGH-PSRR, FAST, RF, 1.5-A
LOW-DROPOUT LINEAR REGULATORS
FEATURES
• 1.5-A Low-Dropout Regulator With Enable
• Available in Fixed and Adjustable (1.2-V to
5.5-V) Output Versions
• High PSRR (49 dB at 10 kHz)
• Ultralow Noise (48 µV_RMS, TPS78630)
• Fast Start-Up Time (50 µs)
• Stable With a 1-µF Ceramic Capacitor
• Excellent Load/Line Transient Response
• Very Low Dropout Voltage (390 mV at Full
Load, TPS78630)
• 6-Pin SOT223 and 5-Pin DDPAK Package
APPLICATIONS
• RF: VCOs, Receivers, ADCs
• Audio
• Bluetooth^®, Wireless LAN
• Cellular and Cordless Telephones
• Handheld Organizers, PDAs
DESCRIPTION
The TPS786xx 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 DDPAK-5
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, 390 mV at 1.5 A). 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 TPS78630 exhibits approximately 48
µV_RMS of output voltage at 3.0 V output noise 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
EN
IN
GND
OUT
NR/FB
KTT PACKAGE
DDPAK-5
(TOP VIEW)
1
2
TAB
3
4
GND
5
TPS78630
RIPPLE REJECTION
vs
FREQUENCY
80
V_IN = 4 V
70
C_OUT = 10 µF
I_OUT = 1 mA
C_NR = 0.01 µF
60
50
I_OUT = 1.5 A
40
30
20
10
0
1 10 100 1k 10k 100k 1M 10M
Frequency (Hz)
TPS78630
OUTPUT SPECTRAL NOISE DENSITY
vs
FREQUENCY
0.8
V_IN = 5.5 V
0.7
C_OUT = 2.2 µF
C_NR = 0.1 µF
0.6
0.5
0.4
0.3
I_OUT = 1 mA
0.2
0.1 ^IOUT ^{= 1.5 A}
0.0
100
1k
10k
Frequency (Hz)
100k
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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