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TPS73150DBVR Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza TPS73150DBVR
Descripción Electrónicos  Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

TPS73150DBVR Datasheet(HTML) 11 Page - Texas Instruments

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APPLICATION INFORMATION
INPUT AND OUTPUT CAPACITOR
OUTPUT NOISE
TPS731xx
GND
EN
NR
IN
OUT
V
IN
V
OUT
Optional input capacitor.
May improve source
impedance, noise, or PSRR.
Optional output capacitor.
May improve load transient,
noise, or PSRR.
Optional bypass
capacitor to reduce
output noise.
V
N
+ 32mVRMS
(R
1
) R2)
R
2
+ 32mVRMS
V
OUT
V
REF
(1)
V
N(mVRMS)
+ 27
mVRMS
V
V
OUT(V)
(2)
TPS731xx
GND
EN
FB
IN
OUT
V
IN
V
OUT
V
OUT =
× 1.204
(R
1 + R2)
R
1
C
FB
R
2
Optional input capacitor.
May improve source
impedance, noise, or PSRR.
Optional output capacitor.
May improve load transient,
noise, or PSRR.
Optional capacitor
reduces output noise.
R2
V
N(mVRMS)
+ 8.5
mVRMS
V
V
OUT(V)
(3)
TPS73101, TPS73115, TPS73118
TPS73125, TPS73130, TPS73132
TPS73133, TPS73150
SBVS034E – SEPTEMBER 2003 – REVISED SEPTEMBER 2004
The TPS731xx belongs to a family of new generation
LDO regulators that use an NMOS pass transistor to
REQUIREMENTS
achieve ultra-low-dropout performance, reverse cur-
rent blockage, and freedom from output capacitor
Although an input capacitor is not required for stab-
constraints. These features, combined with low noise
ility, it is good analog design practice to connect a
and an enable input, make the TPS731xx ideal for
0.1µF to 1µF low ESR capacitor across the input
portable applications. This regulator family offers a
supply near the regulator. This counteracts reactive
wide selection of fixed output voltage versions and an
input sources and improves transient response, noise
adjustable output version. All versions have thermal
rejection, and ripple rejection. A higher-value capaci-
and over-current protection, including foldback cur-
tor may be necessary if large, fast rise-time load
rent limit.
transients are anticipated or the device is located
several inches from the power source.
Figure 31 shows the basic circuit connections for the
fixed voltage models. Figure 32 gives the connections
The TPS731xx does not require an output capacitor
for the adjustable output version (TPS73101).
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
VIN - VOUT < 0.5V and multiple low ESR capacitors
are in parallel, ringing may occur when the product of
COUT and total ESR drops below 50nΩF. Total ESR
includes all parasitic resistances, including capacitor
ESR and board, socket, and solder joint resistance.
In most applications, the sum of capacitor ESR and
trace resistance will meet this requirement.
A precision band-gap reference is used to generate
the internal reference voltage, VREF. This reference is
the dominant noise source within the TPS731xx and
Figure 31. Typical Application Circuit for
it
generates
approximately
32µVRMS
(10Hz
to
Fixed-Voltage Versions
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:
Since the value of VREF is 1.2V, this relationship
reduces to:
for the case of no CNR.
An internal 27k
Ω resistor in series with the noise
Figure 32. Typical Application Circuit for
reduction pin (NR) forms a low-pass filter for the
Adjustable-Voltage Versions
voltage reference when an external noise reduction
capacitor, CNR, is connected from NR to ground. For
R1 and R2 can be calculated for any output voltage
CNR = 10nF, the total noise in the 10Hz to 100kHz
using the formula shown in Figure 32. Sample re-
bandwidth is reduced by a factor of ~3.2, giving the
sistor values for common output voltages are shown
approximate relationship:
in Figure 2. For best accuracy, make the parallel
combination of R1 and R2 approximately 19kΩ.
for CNR = 10nF.
11


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