Moteur de recherche de fiches techniques de composants électroniques
  French  ▼
ALLDATASHEET.FR

X  

TPS79618 Fiches technique(PDF) 9 Page - Texas Instruments

No de pièce TPS79618
Description  ULTRALOW-NOISE, HIGH PSRR, FAST RF 1-A LOW-DROPOUT LINEAR REGULATORS
Download  18 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS79618 Fiches technique(HTML) 9 Page - Texas Instruments

Back Button TPS79618 Datasheet HTML 5Page - Texas Instruments TPS79618 Datasheet HTML 6Page - Texas Instruments TPS79618 Datasheet HTML 7Page - Texas Instruments TPS79618 Datasheet HTML 8Page - Texas Instruments TPS79618 Datasheet HTML 9Page - Texas Instruments TPS79618 Datasheet HTML 10Page - Texas Instruments TPS79618 Datasheet HTML 11Page - Texas Instruments TPS79618 Datasheet HTML 12Page - Texas Instruments TPS79618 Datasheet HTML 13Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 9 / 18 page
background image
www.ti.com
APPLICATION INFORMATION
Board Layout Recommendation to Improve
GND
EN
NR
IN
OUT
V
IN
V
OUT
0.01
µF
TPS796xx
2.2
µF
1
µF
External Capacitor Requirements
Regulator Mounting
Programming the TPS79601 Adjustable LDO
V
O +
V
REF
1 )
R1
R2
(1)
TPS79601, TPS79618, TPS79625
TPS79628, TPS79630, TPS79633
SLVS351D – SEPTEMBER 2002 – REVISED OCTOBER 2004
The TPS796xx family of low-dropout (LDO) regulators
For example, the TPS79630 exhibits 40 µVRMS of
has been optimized for use in noise-sensitive equip-
output voltage noise using a 0.1-µF ceramic bypass
ment. The device features extremely low dropout
capacitor and a 10-µF ceramic output capacitor. Note
voltages, high PSRR, ultralow output noise, low
that the output starts up slower as the bypass
quiescent current (265 µA typically), and enable input
capacitance increases due to the RC time constant at
to reduce supply currents to less than 1 µA when the
the bypass pin that is created by the internal 250-k
regulator is turned off.
resistor and external capacitor.
A typical application circuit is shown in Figure 22.
PSRR and Noise Performance
To improve ac measurements like PSRR, output
noise, and transient response, it is recommended that
the board be designed with separate ground planes
for VIN and VOUT, with each ground plane connected
only at the ground pin of the device. In addition, the
Figure 22. Typical Application Circuit
ground connection for the bypass capacitor should
connect directly to the ground pin of the device.
Although not required, it is good analog design
The tab of the SOT223-6 package is electrically
practice to place a 0.1-µF — 2.2-µF capacitor near
connected to ground. For best thermal performance,
the input of the regulator to counteract reactive input
the tab of the surface-mount version should be
sources. A 2.2-µF or larger ceramic input bypass
soldered directly to a circuit-board copper area.
capacitor, connected between IN and GND and
Increasing the copper area improves heat dissipation.
located close to the TPS796xx, is required for stability
and improves transient response, noise rejection, and
Solder pad footprint recommendations for the devices
ripple rejection. A higher-value input capacitor may be
are presented in an application bulletin Solder Pad
necessary if large, fast-rise-time load transients are
Recommendations for Surface-Mount Devices, litera-
anticipated and the device is located several inches
ture number AB-132, available for download from the
from the power source.
TI web site (www.ti.com).
Like most low dropout regulators, the TPS796xx
requires an output capacitor connected between OUT
Regulator
and GND to stabilize the internal control loop. The
minimum recommended capacitance is 1 µF. Any
The output voltage of the TPS79601 adjustable
1 µF or larger ceramic capacitor is suitable.
regulator is programmed using an external resistor
divider as shown in Figure 28. The output voltage is
The internal voltage reference is a key source of
calculated using Equation 1:
noise in an LDO regulator. The TPS796xx has an NR
pin which is connected to the voltage reference
through a 250-k
Ω internal resistor. The 250-kΩ
internal resistor, in conjunction with an external by-
where:
pass capacitor connected to the NR pin, creates a
low-pass filter to reduce the voltage reference noise
VREF = 1.2246 V typ (the internal reference
and, therefore, the noise at the regulator output. In
voltage)
order for the regulator to operate properly, the current
Resistors R1 and R2 should be chosen for approxi-
flow out of the NR pin must be at a minimum,
mately 40-µA divider current. Lower value resistors
because any leakage current creates an IR drop
can be used for improved noise performance, but the
across the internal resistor, thus creating an output
device wastes more power. Higher values should be
error. Therefore, the bypass capacitor must have
avoided, as leakage current at FB increases the
minimal
leakage
current.
The
bypass
capacitor
output voltage error.
should be no more than 0.1-µF in order to ensure that
it is fully charged during the quickstart time provided
by the internal switch shown in the functional block
diagram.
9


Numéro de pièce similaire - TPS79618

FabricantNo de pièceFiches techniqueDescription
logo
Texas Instruments
TPS79618DCQ TI-TPS79618DCQ Datasheet
997Kb / 33P
[Old version datasheet]   ULTRALOW-NOISE, HIGH PSRR, FAST, RF, 1A LOW-DROPOUT LINEAR REGULATORS
TPS79618DCQ TI1-TPS79618DCQ Datasheet
1Mb / 30P
[Old version datasheet]   Ultralow-Noise, High PSRR, Fast, RF, 1A Low-Dropout Linear Regulators
TPS79618DCQG4 TI-TPS79618DCQG4 Datasheet
997Kb / 33P
[Old version datasheet]   ULTRALOW-NOISE, HIGH PSRR, FAST, RF, 1A LOW-DROPOUT LINEAR REGULATORS
TPS79618DCQG4 TI1-TPS79618DCQG4 Datasheet
1Mb / 30P
[Old version datasheet]   Ultralow-Noise, High PSRR, Fast, RF, 1A Low-Dropout Linear Regulators
TPS79618DCQR TI-TPS79618DCQR Datasheet
997Kb / 33P
[Old version datasheet]   ULTRALOW-NOISE, HIGH PSRR, FAST, RF, 1A LOW-DROPOUT LINEAR REGULATORS
More results

Description similaire - TPS79618

FabricantNo de pièceFiches techniqueDescription
logo
Texas Instruments
TPS79633-Q1 TI1-TPS79633-Q1 Datasheet
779Kb / 19P
[Old version datasheet]   Ultralow-Noise, High-PSRR, Fast, RF, 1-A LOW-DROPOUT LINEAR REGULATORS
TPS796 TI-TPS796_15 Datasheet
1Mb / 39P
[Old version datasheet]   TPS796xx Ultralow-Noise, High PSRR, Fast, RF, 1-A Low-Dropout Linear Regulators
TPS78601 TI-TPS78601 Datasheet
559Kb / 17P
[Old version datasheet]   ULTRALOW-NOISE, HIGH PSRR, FAST RF 1.5 A LOW-DROPOUT LINEAR REGULATORS
TPS78601DRBR TI1-TPS78601DRBR Datasheet
1Mb / 29P
[Old version datasheet]   ULTRALOW-NOISE, HIGH-PSRR, FAST, RF, 1.5-A LOW-DROPOUT LINEAR REGULATORS
TPS786 TI1-TPS786_16 Datasheet
1Mb / 37P
[Old version datasheet]   Ultralow-Noise, High-PSRR, Fast, RF, 1.5-A Low-Dropout Linear Regulators
TPS786XX TI-TPS786XX Datasheet
752Kb / 21P
[Old version datasheet]   ULTRALOW-NOISE, HIGH-PSRR, FAST, RF, 1.5-A LOW-DROPOUT LINEAR REGULATORS
TPS796XX TI-TPS796XX_08 Datasheet
1Mb / 25P
[Old version datasheet]   ULTRALOW-NOISE, HIGH PSRR, FAST, RF, 1A LOW-DROPOUT LINEAR REGULATORS
TPS79118-Q1 TI-TPS79118-Q1 Datasheet
900Kb / 21P
[Old version datasheet]   ULTRALOW NOISE,HIGH PSRR,FAST RF 100MA LOW-DROPOUT LINEAR REGULATORS
TPS796 TI1-TPS796_14 Datasheet
1Mb / 31P
[Old version datasheet]   Ultralow-Noise, High PSRR, Fast, RF, 1A Low-Dropout Linear Regulators
TPS79601DRBR TI1-TPS79601DRBR Datasheet
1Mb / 30P
[Old version datasheet]   Ultralow-Noise, High PSRR, Fast, RF, 1A Low-Dropout Linear Regulators
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18


Fiches technique Télécharger

Go To PDF Page


Lien URL




Politique de confidentialité
ALLDATASHEET.FR
ALLDATASHEET vous a-t-il été utile ?  [ DONATE ] 

À propos de Alldatasheet   |   Publicité   |   Contactez-nous   |   Politique de confidentialité   |   Echange de liens   |   Fabricants
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com