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TPS73701DRBTG4 Fiches technique(PDF) 11 Page - Texas Instruments

No de pièce TPS73701DRBTG4
Description  1A Low-Dropout Regulator with Reverse Current Protection
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS73701DRBTG4 Fiches technique(HTML) 11 Page - Texas Instruments

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APPLICATION INFORMATION
INPUT AND OUTPUT CAPACITOR
TPS737xx
GND
EN
IN
OUT
V
IN
V
OUT
ON
OFF
OUTPUT NOISE
TPS73701
GND
EN
FB
IN
OUT
V
IN
V
OUT
V
OUT =
x1.204
(R
1 + R2)
R
2
R
1
C
FB
R
2
Optionalinputcapacitor.
Mayimprovesource
impedance,noise,orPSRR.
Outputcapacitor
mustbe
1.0 F.
³
m
Optionalcapacitor
reducesoutputnoise
andimproves
transientresponse.
OFF
ON
V
N
+ 32mVRMS
(R
1
) R2)
R
2
+ 32mVRMS
V
OUT
V
REF
(1)
V
N mVRMS
+ 27
mVRMS
V
V
OUT (V)
(2)
TPS737xx
www.ti.com.................................................................................................................................................... SBVS067I – JANUARY 2006 – REVISED MARCH 2009
in addition to the internal 8k
Ω resistor, presents the
The TPS737xx belongs to a family of new generation
same impedance to the error amp as the 27k
LDO regulators that use an NMOS pass transistor to
bandgap reference output. This impedance helps
achieve
ultra-low-dropout
performance,
reverse
compensate
for
leakages
into
the
error
amp
current blockage, and freedom from output capacitor
terminals.
constraints. These features combined with an enable
input
make
the
TPS737xx
ideal
for
portable
applications. This regulator family offers a wide
REQUIREMENTS
selection of fixed output voltage versions and an
adjustable output version. All versions have thermal
Although an input capacitor is not required for stability
and
over-current
protection,
including
foldback
if input impedance is very low, it is good analog
current limit.
design practice to connect a 0.1
µF to 1µF low
equivalent series resistance (ESR) capacitor across
Figure 31 shows the basic circuit connections for the
the input supply near the regulator. This capacitor
fixed voltage models. Figure 32 gives the connections
counteracts reactive input sources and improves
for the adjustable output version (TPS73701).
transient
response,
noise
rejection,
and
ripple
rejection. A higher-value capacitor may be necessary
if large, fast rise-time load transients are anticipated
or the device is located several inches from the
power source.
The TPS737xx requires a 1.0µF output capacitor for
stability. 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
Figure 31. Typical Application Circuit for
may occur when the product of COUT and total ESR
Fixed-Voltage Versions
drops below 50n
ΩF. 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 bandgap reference is used to generate
the internal reference voltage, VREF. This reference is
the dominant noise source within the TPS737xx and
it
generates
approximately
32
µV
RMS
(10Hz
to
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:
Figure 32. Typical Application Circuit for
Adjustable-Voltage Version
Since the value of VREF is 1.2V, this relationship
R1 and R2 can be calculated for any output voltage
reduces to:
using the formula shown in Figure 32. Sample
resistor values for common output voltages are
shown in Figure 2.
For best accuracy, make the parallel combination of
R1 and R2 approximately equal to 19kΩ. This 19kΩ,
for the case of no CNR.
Copyright © 2006–2009, Texas Instruments Incorporated
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