The TPS731xx family of low-dropout (LDO) linear voltage regulators uses a new topology: an NMOS pass element in a voltage-follower configuration

 

TPS73101

Manufacturer Part NumberTPS73101
DescriptionThe TPS731xx family of low-dropout (LDO) linear voltage regulators uses a new topology: an NMOS pass element in a voltage-follower configuration
ManufacturerTexas Instruments
TPS73101 datasheets

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Specifications of TPS73101

Iout(max)(a)0.1Vdo(typ)(mv)30
Iq(typ)(ma)0.4Vin(min)(v)1.7
Vin(max)(v)5.5Vout Adj(min)(v)1.2
Vout Adj(max)(v)5.5Accuracy(%)1
Output Capacitor TypeCapacitor FreeVout(min)(v)1.2
Vout(max)(v)5.5Pin/package5SOT-23
Regulated Outputs(#)1  
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..........................................................................................................................................
The TPS731xx belongs to a family of new generation
LDO regulators that use an NMOS pass transistor to
achieve
ultra-low-dropout
performance,
current blockage, and freedom from output capacitor
constraints. These features, combined with low noise
and an enable input, make the TPS731xx ideal for
portable applications. This regulator family offers a
wide selection of fixed output voltage versions and an
adjustable output version. All versions have thermal
and
over-current
protection,
current limit.
Figure 31
shows the basic circuit connections for the
fixed voltage models.
Figure 32
gives the connections
for the adjustable output version (TPS73101).
Optional input capacitor.
Optional output capacitor.
May improve source
May improve load transient,
impedance, noise, or PSRR.
V
IN
IN
OUT
TPS731xx
EN
GND
NR
ON
OFF
Optional bypass
capacitor to reduce
output noise.
Figure 31. Typical Application Circuit for
Fixed-Voltage Versions
Optional input capacitor.
May improve source
May improve load transient,
impedance, noise, or PSRR.
V
IN
OUT
IN
TPS73101
R
1
EN
GND
FB
ON
R
OFF
2
(R
+ R
)
1
2
V
=
x 1.204
OUT
R
2
Figure 32. Typical Application Circuit for
Adjustable-Voltage Version
R
and R
can be calculated for any output voltage
1
2
using the formula shown in
Figure
resistor values for common output voltages are
shown in
Figure
2.
Copyright © 2003–2009, Texas Instruments Incorporated
APPLICATION INFORMATION
For best accuracy, make the parallel combination of
R
and R
1
in addition to the internal 8kΩ resistor, presents the
reverse
same impedance to the error amp as the 27kΩ
bandgap reference output. This impedance helps
compensate
terminals.
INPUT AND OUTPUT CAPACITOR
REQUIREMENTS
including
foldback
Although an input capacitor is not required for
stability, it is good analog design practice to connect
a 0.1μF to 1μF low ESR capacitor across the input
supply near the regulator. This counteracts reactive
input sources and improves transient response, noise
rejection,
capacitor may be necessary if large, fast rise-time
load transients are anticipated or the device is
noise, or PSRR.
located several inches from the power source.
V
OUT
The TPS731xx does not require an output capacitor
for stability and has maximum phase margin with no
capacitor. It is designed to be stable for all available
types and values of capacitors. In applications where
multiple low ESR capacitors are in parallel, ringing
may occur when the product of C
drops below 50nΩF. Total ESR includes all parasitic
resistances, including capacitor ESR and board,
socket,
applications, the sum of capacitor ESR and trace
resistance will meet this requirement.
OUTPUT NOISE
Optional output capacitor.
A precision band-gap reference is used to generate
noise, or PSRR.
the internal reference voltage, V
V
the dominant noise source within the TPS731xx and
OUT
it
generates
C
FB
100kHz) at the reference output (NR). The regulator
control loop gains up the reference noise with the
same gain as the reference voltage, so that the noise
voltage of the regulator is approximately given by:
Optional capacitor
reduces output noise
V
+ 32mV
and improves
N
transient response.
Since the value of V
reduces to:
V
(mV
N
RMS
32. Sample
for the case of no C
TPS731xx
SBVS034M – SEPTEMBER 2003 – REVISED AUGUST 2009
approximately equal to 19kΩ. This 19kΩ,
2
for
leakages into the error amp
and
ripple
rejection.
A
higher-value
and total ESR
OUT
and
solder
joint
resistance.
. This reference is
REF
approximately
32μV
RMS
V
(R
) R
)
1
2
+ 32mV
RMS
RMS
R
V
2
is 1.2V, this relationship
REF
mV
RMS
) + 27
V
(V)
OUT
V
.
NR
Submit Documentation Feedback
In
most
(10Hz
to
OUT
(1)
REF
(2)
11

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