TPS71719

Manufacturer Part NumberTPS71719
DescriptionThe TPS717xx family of low-dropout (LDO), low-power linear regulators offers very high power supply rejection (PSRR) while maintaining very low 45µA ground current in an ultra-small, five-pin SC70 package
ManufacturerTexas Instruments
TPS71719 datasheet
 


Specifications of TPS71719

Iout(max)(a)0.1Vdo(typ)(mv)170
Iq(typ)(ma)0.05Vin(min)(v)2.5
Vin(max)(v)6.5Vout Adj(min)(v)1.9
Vout Adj(max)(v)1.9Accuracy(%)3
Output Capacitor TypeCeramicFixed Output Options(v)1.9
Vout(min)(v)1.9Vout(max)(v)1.9
Pin/package5SC70Regulated Outputs(#)1
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The TPS717xx belongs to a family of new generation
LDO regulators that use innovative circuitry to
achieve ultra-wide bandwidth and high loop gain,
resulting in extremely high PSRR (up to 1MHz) at
very low headroom (V
– V
IN
OUT
versions provide a noise reduction pin to bypass
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
applications.
This
family
of
sub-bandgap output voltages, current limit and
thermal protection, and is fully specified from –40°C
to +125°C.
Figure 33
shows the basic circuit connections for the
fixed voltage options.
Figure 34
gives the connections
for the adjustable output version (TPS71701). Note
that the NR pin is not available on the adjustable
version.
Optional 1.0 F input
m
capacitor. May improve
source impedance, noise
or PSRR.
V
IN
OUT
IN
TPS717xx
EN
GND
NR
V
EN
Optional 0.01 F bypass
capacitor to reduce
output noise and
increase PSRR.
Figure 33. Typical Application Circuit
(Fixed Voltage Versions)
Optional 1.0 F input
m
capacitor. May improve
source impedance, noise
or PSRR.
V
IN
OUT
IN
TPS71701
EN
GND
FB
V
EN
Figure 34. Typical Application Circuit
(Adjustable Voltage Version)
Copyright © 2006–2009, Texas Instruments Incorporated
APPLICATION INFORMATION
For the adjustable version (TPS71701), the NR pin is
replaced with a feedback (FB) pin. The voltage on
this pin sets the output voltage and is determined by
the values of R
). Fixed voltage
be calculated for any voltage using the formula given
in
Equation
(R
+
1
V
=
OUT
R
for
portable
The value of R
regulators
offers
device and should be chosen at approximately 160kΩ
or 320kΩ. Sample resistor values for common output
voltages are shown in
Table 2. Sample 1% Resistor Values for Common
V
OUT
1.0
1.2
1.5
1.8
2.5
3.3
V
OUT
5.0
1 F
m
Ceramic
Input and Output Capacitor Requirements
Although an input capacitor is not required for
stability, it is good analog design practice to connect
m
a 0.1 F to 1.0 F 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
rejection,
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 F
input capacitor may be necessary to ensure stability.
The TPS717xx is designed to be stable with standard
V
ceramic capacitors of values 1.0 F or larger. X5R-
OUT
and X7R-type capacitors are best because they have
1 F
R
m
1
Ceramic
minimal variation in value and ESR over temperature.
Maximum ESR should be <1.0Ω.
R
2
The TPS717xx implements an innovative internal
compensation circuit that does not require a feedback
capacitor across R
should not be used for this device.
TPS717xx
SBVS068G – FEBRUARY 2006 – REVISED APRIL 2009
and R
. The values of R
and R
1
2
1
1:
R
)
2
x 0.800, R ~ 320k
W
2
2
directly impacts the stability of the
2
Table
2.
Output Voltages
R
R
1
2
80.6kΩ
324kΩ
162kΩ
324kΩ
294kΩ
332kΩ
402kΩ
324kΩ
665kΩ
316kΩ
1.02MΩ
324kΩ
1.74MΩ
332kΩ
and
ripple
rejection.
A
higher-value
for stability. A feedback capacitor
2
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