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TPS73632DBVRG4 Fiches technique(PDF) 11 Page - Texas Instruments

No de pièce TPS73632DBVRG4
Description  Cap-Free, NMOS, 400mA 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

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APPLICATION INFORMATION
Input and Output Capacitor Requirements
Optionalinputcapacitor
Mayimprovesource
impedance,noise,orPSRR.
Optionaloutputcapacitor.
Mayimproveloadtransient,
noise,orPSRR.
Optionalbypass
capacitortoreduce
outputnoise.
V
IN
V
OUT
IN
EN
GND
NR
OUT
TPS736xx
Output Noise
V
N
+ 32mVRMS
(R
1
) R2)
R
2
+ 32mVRMS
V
OUT
V
REF
(1)
TPS73601
GND
EN
FB
IN
OUT
VIN
VOUT
V
OUT =
x1.204
(R
1 + R2)
R2
R
1
C
FB
R
2
Optionalinputcapacitor.
Mayimprovesource
impedance,noise,orPSRR.
Optionaloutputcapacitor.
Mayimproveloadtransient,
noise,orPSRR.
Optionalcapacitor
reducesoutputnoise
andimproves
transientresponse.
V
N(mVRMS)
+ 27
mVRMS
V
V
OUT(V)
(2)
TPS736xx
SBVS038Q – SEPTEMBER 2003 – REVISED AUGUST 2007
R1 and R2 approximately euqal to 19kΩ. This 19kΩ,
The TPS736xx belongs to a family of new generation
in addition to the internal 8k
Ω resistor, presents the
LDO regulators that use an NMOS pass transistor to
same impedance to the error amp as the 27k
achieve
ultra-low-dropout
performance,
reverse
bandgap reference output. This impedance helps
current blockage, and freedom from output capacitor
compensate
for
leakages
into
the
error
amp
constraints. These features, combined with low noise
terminals.
and an enable input, make the TPS736xx 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
Although an input capacitor is not required for
and
over-current
protection,
including
foldback
stability, it is good analog design practice to connect
current limit.
a 0.1
μF to 1μF low ESR capacitor across the input
supply near the regulator. This counteracts reactive
Figure 31 shows the basic circuit connections for the
input sources and improves transient response, noise
fixed voltage models. Figure 32 gives the connections
rejection,
and
ripple
rejection.
A
higher-value
for the adjustable output version (TPS73601).
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 TPS736xx 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
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.
Figure 31. Typical Application Circuit for
Fixed-Voltage Versions
A precision band-gap reference is used to generate
the internal reference voltage, VREF. This reference is
the dominant noise source within the TPS736xx and
it
generates
approximately
32
μVRMS
(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:
Since the value of VREF is 1.2V, this relationship
Figure 32. Typical Application Circuit for
reduces to:
Adjustable-Voltage Version
R1 and R2 can be calculated for any output voltage
using the formula shown in Figure 32. Sample
for the case of no CNR.
resistor values for common output voltages are
shown in Figure 2.
For best accuracy, make the parallel combination of
Copyright © 2003–2007, Texas Instruments Incorporated
Submit Documentation Feedback
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Product Folder Link(s): TPS736xx


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