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TPS79525 Datasheet(PDF) 9 Page - Texas Instruments

No. de pieza TPS79525
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

TPS79525 Datasheet(HTML) 9 Page - Texas Instruments

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APPLICATION INFORMATION
GND
EN
NR
IN
OUT
V
IN
V
OUT
0.01
µF
2.2
µF
1
µF
TPS795xx
Board Layout Recommendation to Improve
External Capacitor Requirements
Regulator Mounting
TPS79501, TPS79516
TPS79518, TPS79525
TPS79530, TPS79533
SLVS350C – OCTOBER 2002 – REVISED JANUARY 2005
because any leakage current creates an IR drop
The TPS795xx family of low-dropout (LDO) regulators
across the internal resistor thus creating an output
has been optimized for use in noise-sensitive equip-
error. Therefore, the bypass capacitor must have
ment. The device features extremely low dropout
minimal
leakage
current.
The
bypass
capacitor
voltages, high PSRR, ultralow output noise, low
should be no more than 0.1-µF in order to ensure that
quiescent current (265 µA typically), and enable input
it is fully charged during the quickstart time provided
to reduce supply currents to less than 1 µA when the
by the internal switch shown in the functional block
regulator is turned off.
diagram.
A typical application circuit is shown in Figure 23.
For example, the TPS79530 exhibits only 33 µVRMS
of output voltage noise using a 0.1-µF ceramic
bypass capacitor and a 10-µF ceramic output capaci-
tor. Note that the output starts up slower as the
bypass capacitance increases due to the RC time
constant at the bypass pin that is created by the
internal 250-k
Ω resistor and external capacitor.
Figure 23. Typical Application Circuit
PSRR and Noise Performance
To improve ac measurements like PSRR, output
A 1-µF or larger ceramic input bypass capacitor,
noise, and transient response, it is recommended that
connected between IN and GND and located close to
the board be designed with separate ground planes
the TPS795xx, is required for stability and improves
for VIN and VOUT, with each ground plane connected
transient response, noise rejection, and ripple rejec-
only at the ground pin of the device. In addition, the
tion. A higher-value input capacitor may be necessary
ground connection for the bypass capacitor should
if large, fast-rise-time load transients are anticipated
connect directly to the ground pin of the device.
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 OUT
connected to ground. For best thermal performance,
and GND to stabilize the internal control loop. The
the tab of the surface-mount version should be
minimum recommended capacitance is 1 µF. Any
soldered directly to a circuit-board copper area.
1 µF or larger ceramic capacitor is suitable.
Increasing the copper area improves heat dissipation.
The internal voltage reference is a key source of
Solder pad footprint recommendations for the devices
noise in an LDO regulator. The TPS795xx has an NR
are presented in an application bulletin Solder Pad
pin which is connected to the voltage reference
Recommendations for Surface-Mount Devices, litera-
through a 250-k
Ω internal resistor. The 250-kΩ
ture number AB-132, available from the TI web site
internal resistor, in conjunction with an external by-
(www.ti.com).
pass capacitor connected to the NR pin, creates a
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,
9


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