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TPS73215DBVT Datasheet(PDF) 11 Page - Texas Instruments

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No. de pieza TPS73215DBVT
Descripción Electrónicos  Cap-Free, NMOS, 250mA 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

TPS73215DBVT Datasheet(HTML) 11 Page - Texas Instruments

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APPLICATION INFORMATION
INPUT AND OUTPUT CAPACITOR
TPS732xx
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.
OUTPUT NOISE
V
N
+ 32mVRMS
(R
1
) R2)
R
2
+ 32mVRMS
V
OUT
V
REF
(1)
TPS732xx
GND
EN
FB
IN
OUT
V
IN
V
OUT
V
OUT =
× 1.204
(R
1 + R2)
R
1
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
and improves
transient response.
V
N(mVRMS)
+ 27
mVRMS
V
V
OUT(V)
(2)
TPS732xx
SBVS037I – AUGUST 2003 – REVISED MAY 2006
in addition to the internal 8k
Ω resistor, presents the
The TPS732xx 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 low noise
and an enable input, make the TPS732xx ideal for
portable applications. This regulator family offers a
REQUIREMENTS
wide selection of fixed output voltage versions and
an adjustable output version. All versions have
Although an input capacitor is not required for
thermal
and
over-current
protection,
including
stability, it is good analog design practice to connect
foldback current limit.
a 0.1µF 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,
fixed
voltage
models.
Figure
32
gives
the
noise rejection, and ripple rejection. A higher-value
connections
for
the
adjustable
output
version
capacitor may be necessary if large, fast rise-time
(TPS73201).
load transients are anticipated or the device is
located several inches from the power source.
The TPS732xx 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 TPS732xx and
it generates approximately 32µVRMS (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
reduces to:
Figure 32. Typical Application Circuit for
Adjustable-Voltage Versions
for the case of no CNR.
R1 and R2 can be calculated for any output voltage
An internal 27k
Ω resistor in series with the noise
using the formula shown in Figure 32. Sample
reduction pin (NR) forms a low-pass filter for the
resistor values for common output voltages are
voltage reference when an external noise reduction
shown in Figure 2.
capacitor, CNR, is connected from NR to ground. For
CNR = 10nF, the total noise in the 10Hz to 100kHz
For best accuracy, make the parallel combination of
bandwidth is reduced by a factor of ~3.2, giving the
R1 and R2 approximately euqal to 19kΩ. This 19kΩ,
approximate relationship:
11
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