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TPS79933DRVRG4 Fiches technique(PDF) 10 Page - Texas Instruments

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No de pièce TPS79933DRVRG4
Description  200mA, Low Quiescent Current, Ultra-Low Noise, High PSRR Low Dropout Linear Regulator
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS79933DRVRG4 Fiches technique(HTML) 10 Page - Texas Instruments

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APPLICATION INFORMATION
Feedback Capacitor Requirements
Output Noise
Input and Output Capacitor Requirements
TPS799xx
GND
EN
NR
IN
OUT
V
IN
V
OUT
Optional input capacitor.
May improve source
impedance, noise, or PSRR.
Optional bypass capacitor
to reduce output noise
and increase PSRR.
2.2
µF
Ceramic
V
EN
TPS799xx
GND
EN
FB
IN
OUT
V
IN
V
OUT
R
1
C
FB
R
2
Optional input capacitor.
May improve source
impedance, noise, or PSRR.
V
OUT =
× 1.193
(R
1 + R2)
R
2
V
EN
2.2
µF
Ceramic
TPS799xx
SBVS056G – JANUARY 2005 – REVISED AUGUST 2006
The TPS799xx family of LDO regulators combines
The TPS799xx is designed to be stable with
the high performance required of many RF and
standard ceramic capacitors of values 2.2
µF or
precision analog applications with ultra-low current
larger. X5R and X7R type capacitors are best as
consumption. High PSRR is provided by a high gain,
they have minimal variation in value and ESR over
high bandwidth error loop with good supply rejection
temperature. Maximum ESR should be < 1.0
Ω.
at very low headroom (VIN – VOUT). Fixed voltage
versions provide a noise reduction pin to bypass
noise generated by the bandgap reference and to
(TPS79901 only)
improve PSRR while a quick-start circuit fast-charges
The feedback capacitor, CFB, shown in Figure 29 is
this capacitor at startup. The combination of high
required for stability. For a parallel combination of R1
performance and low ground current also make the
and R2 equal to 250kΩ, any value from 3pF to 1nF
TPS799xx
an
excellent
choice
for
portable
can be used. Fixed voltage versions have an internal
applications.
All
versions
have
thermal
and
30pF feedback capacitor which is quick-charged at
over-current protection and are fully specified from
start-up. The adjustable version does not have this
–40
°C to +125°C.
quick-charge circuit, so values below 5pF should be
Figure 28 shows the basic circuit connections for
used to ensure fast startup; values above 47pF can
fixed
voltage
models.
Figure
29
gives
the
be used to implement an output voltage soft-start.
connections
for
the
adjustable
output
version
Larger value capacitors also improve noise slightly.
(TPS79901). R1 and R2 can be calculated for any
The TPS79901 is stable in unity-gain configuration
output voltage using the formula in Figure 29.
(OUT tied to FB) without CFB.
Sample resistor values for common output voltages
are shown in Figure 29.
In most LDOs, the bandgap is the dominant noise
source. If a noise reduction capacitor (CNR) is used
Although an input capacitor is not required for
with the TPS799xx, the bandgap does not contribute
stability, it is good analog design practice to connect
significantly to noise. Instead, noise is dominated by
a 0.1
µF to 1µF low ESR capacitor across the input
the output resistor divider and the error amplifier
supply near the regulator. This will counteract
input. To minimize noise in a given application, use a
reactive
input
sources
and
improve
transient
0.01
µF noise reduction capacitor; for the adjustable
response, noise rejection, and ripple rejection. A
version, smaller value resistors in the output resistor
higher-value capacitor may be necessary if large,
divider reduce noise. A parallel combination that
fast rise-time load transients are anticipated or the
gives 2
µA of divider current will have the same noise
device is located several inches from the power
performance as a fixed voltage version. To further
source. If source impedance is not sufficiently low, a
optimize noise, equivalent series resistance of the
0.1
µF input capacitor may be necessary to ensure
output capacitor can be set to approximately 0.2
Ω.
stability.
This configuration maximizes phase margin in the
control loop, reducing total output noise by up to
10%.
Figure 28. Typical Application Circuit for
Figure 29. Typical Application Circuit for
Fixed Voltage Versions
Adjustable Voltage Version
10
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