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TPS71715DCKRG4 Fiches technique(PDF) 11 Page - Texas Instruments

No de pièce TPS71715DCKRG4
Description  Low Noise, High-Bandwidth PSRR Low-Dropout 150mA Linear Regulator
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS71715DCKRG4 Fiches technique(HTML) 11 Page - Texas Instruments

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APPLICATION INFORMATION
V
=
OUT
x0.800,R ~320k
2
W
(R
R
1
2
+
)
R
2
(1)
Input and Output Capacitor Requirements
TPS717xx
GND
EN
NR
IN
OUT
V
IN
V
OUT
1 F
m
Ceramic
V
EN
Optional1.0 Finput
capacitor.Mayimprove
sourceimpedance,noise
orPSRR.
m
Optional0.01 Fbypass
capacitortoreduce
outputnoiseand
increasePSRR.
m
TPS71701
GND
EN
FB
IN
OUT
V
IN
V
OUT
1 F
m
Ceramic
V
EN
R
1
R
2
Optional1.0 Finput
capacitor.Mayimprove
sourceimpedance,noise
orPSRR.
m
TPS717xx
SBVS068C – FEBRUARY 2006 – REVISED MARCH 2007
The TPS717xx belongs to a family of new generation
For the adjustable version (TPS71701), the NR pin is
LDO regulators that use innovative circuitry to
replaced with a feedback (FB) pin. The voltage on
achieve ultra-wide bandwidth and high loop gain,
this pin sets the output voltage and is determined by
resulting in extremely high PSRR (up to 1MHz) at
the values of R1 and R2. The values of R1 and R2
very low headroom (VIN – VOUT). Fixed voltage
can be calculated for any voltage using the formula
versions provide a noise reduction pin to bypass
given in Equation 1:
noise generated by the bandgap reference and to
improve PSRR while a quick-start circuit fast-charges
this capacitor. These features, combined with low
noise, enable, low ground pin current and ultra-small
packaging,
make
this
part
ideal
for
portable
The value of R2 directly impacts the stability of the
applications.
This
family
of
regulators
offer
device and should be chosen at approximately
sub-bandgap output voltages, current limit and
160k
Ω or 320kΩ. Sample resistor values for common
thermal protection, and is fully specified from –40
°C
output voltages are shown in Table 2.
to +125
°C.
Table 2. Sample 1% Resistor Values for Common
Figure 33 shows the basic circuit connections for the
Output Voltages
fixed
voltage
options.
Figure
34
gives
the
connections
for
the
adjustable
output
version
VOUT
R1
R2
(TPS71701). Note that the NR pin is not available
1.0
80.6k
324k
on the adjustable version.
1.2
162k
324k
1.5
294k
332k
1.8
402k
324k
2.5
665k
316k
3.3
1.02M
324k
5.0
1.74M
332k
Although an input capacitor is not required for
stability, it is good analog design practice to connect
a 0.1
µF to 1.0µF low equivalent series resistance
(ESR) capacitor across the input supply near the
regulator. This capacitor will counteract reactive input
sources and improve transient response, noise
Figure 33. Typical Application Circuit
rejection,
and
ripple
rejection.
A
higher-value
(Fixed Voltage Versions)
capacitor may be necessary if large, fast rise-time
load transients are anticipated or if the device is
located several inches from the power source. If
source impedance is not sufficiently low, a 0.1
µF
input capacitor may be necessary to ensure stability.
The TPS717xx is designed to be stable with
standard ceramic capacitors of values 1.0
µF or
larger. X5R- and X7R-type capacitors are best
because they have minimal variation in value and
ESR over temperature. Maximum ESR should be
<1.0
Ω.
The TPS717xx implements an innovative internal
compensation
circuit
that
does
not
require
a
feedback
capacitor
across
R2 for stability. A
feedback capacitor should not be used for this
Figure 34. Typical Application Circuit
device.
(Adjustable Voltage Version)
11
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