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TPS79525DCQG4 Datasheet(PDF) 8 Page - Texas Instruments

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No. de pieza TPS79525DCQG4
Descripción Electrónicos  ULTRALOW-NOISE, HIGH-PSRR, FAST, RF, 500-mA LOW-DROPOUT LINEAR REGULATORS
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI - Texas Instruments

TPS79525DCQG4 Datasheet(HTML) 8 Page - Texas Instruments

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APPLICATION INFORMATION
TPS795xx
GND
EN
NR
IN
OUT
V
IN
V
OUT
1 F
m
0.01 F
m
1 F
m
BOARD LAYOUT RECOMMENDATION TO
EXTERNAL CAPACITOR REQUIREMENTS
REGULATOR MOUNTING
TPS795xx
SLVS350G – OCTOBER 2002 – REVISED JULY 2006
because any leakage current creates an IR drop
The
TPS795xx
family
of
low-dropout
(LDO)
across the internal resistor, thus creating an output
regulators
has
been
optimized
for
use
in
error. Therefore, the bypass capacitor must have
noise-sensitive
equipment.
The
device
features
minimal leakage current. The bypass capacitor
extremely low dropout voltages, high PSRR, ultralow
should be no more than 0.1-
µF in order to ensure
output
noise,
low
quiescent
current
(265
µA
that it is fully charged during the quickstart time
typically), and an enable input to reduce supply
provided by the internal switch shown in the
currents to less than 1
µA when the regulator is
Functional Block Diagram.
turned off.
For example, the TPS79530 exhibits only 33
µV
RMS
A typical application circuit is shown in Figure 23.
of output voltage noise using a 0.1-
µF ceramic
bypass capacitor and a 10-
µF ceramic output
capacitor. Note that the output starts up slower as
the bypass capacitance increases because of the RC
time constant at the bypass pin that is created by the
internal 250-k
Ω resistor and external capacitor.
IMPROVE PSRR AND NOISE
Figure 23. Typical Application Circuit
PERFORMANCE
To improve ac measurements such as PSRR, output
noise, and transient response, it is recommended
that the board be designed with separate ground
Although not required, it is good analog design
planes for VIN and VOUT, with each ground plane
practice to place a 0.1
µF — 2.2µF capacitor near the
connected only at the ground pin of the device. In
input of the regulator to counteract reactive input
addition, the ground connection for the bypass
sources. A higher-value input capacitor may be
capacitor should connect directly to the ground pin of
necessary if large, fast-rise-time load transients are
the device.
anticipated and the device is located several inches
from the power source.
Like most low-dropout regulators, the TPS795xx
The tab of the SOT223-6 package is electrically
requires an output capacitor connected between
connected to ground. For best thermal performance,
OUT and GND to stabilize the internal control loop.
the tab of the surface-mount version should be
The minimum recommended capacitor is 1
µF. Any 1
soldered directly to a circuit-board copper area.
µF or larger ceramic capacitor is suitable.
Increasing
the
copper
area
improves
heat
The internal voltage reference is a key source of
dissipation.
noise in an LDO regulator. The TPS795xx has an
Solder
pad
footprint
recommendations
for
the
NR pin which is connected to the voltage reference
devices
are
presented
in
Application
Report
through a 250-k
Ω internal resistor. The 250-kΩ
SBFA015,
Solder
Pad
Recommendations
for
internal resistor, in conjunction with an external
Surface-Mount Devices, available from the TI web
bypass capacitor connected to the NR pin, creates a
site (www.ti.com).
low-pass filter to reduce the voltage reference noise
and, therefore, the noise at the regulator output. In
order for the regulator to operate properly, the
current flow out of the NR pin must be at a minimum,
8
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