TPS78601 Datasheet, PDF (1/17 Pages) Texas Instruments – ULTRALOW-NOISE, HIGH PSRR, FAST RF 1.5 A LOW-DROPOUT LINEAR REGULATORS

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TPS78601, TPS78618
TPS78625, TPS78628
TPS78630, TPS78633
SLVS389D – SEPTEMBER 2002 – REVISED OCTOBER 2004
ULTRALOW-NOISE, HIGH PSRR, FAST RF 1.5 A LOW-DROPOUT LINEAR
REGULATORS
FEATURES
• 1.5 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 (49 dB at 10 kHz)
• Ultralow Noise (48 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 (390 mV at Full
Load, TPS78630)
• 6-Pin SOT223-6 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 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, proprietary
BiCMOS fabrication process to yield extremely low
dropout voltages (e.g., 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
5
6
GND
KTT (DDPAK) PACKAGE
(TOP VIEW)
EN
1
IN
2
GND
3
OUT
4
NR
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
0.80
0.70
0.60
V_IN = 5.5 V
C_OUT = 2.2 µF
C_NR = 0.1 µF
0.50
0.40
0.30
I_OUT = 1 mA
0.20
0.10
I_OUT = 1.5 A
0.00
100
1k
10k
Frequency (Hz)
100k
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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 © 2002–2004, Texas Instruments Incorporated