Electronic Components Datasheet Search
  English  ▼
ALLDATASHEET.NET

X  

TPS72017YZUR Datasheet(PDF) 11 Page - Texas Instruments

Click here to check the latest version.
Part # TPS72017YZUR
Description  350mA, Ultra-Low VIN, RF Low-Dropout Linear Regulator with Bias Pin
Download  25 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS72017YZUR Datasheet(HTML) 11 Page - Texas Instruments

Back Button TPS72017YZUR Datasheet HTML 7Page - Texas Instruments TPS72017YZUR Datasheet HTML 8Page - Texas Instruments TPS72017YZUR Datasheet HTML 9Page - Texas Instruments TPS72017YZUR Datasheet HTML 10Page - Texas Instruments TPS72017YZUR Datasheet HTML 11Page - Texas Instruments TPS72017YZUR Datasheet HTML 12Page - Texas Instruments TPS72017YZUR Datasheet HTML 13Page - Texas Instruments TPS72017YZUR Datasheet HTML 14Page - Texas Instruments TPS72017YZUR Datasheet HTML 15Page - Texas Instruments Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 25 page
background image
APPLICATION INFORMATION
INTERNAL CURRENT LIMIT
INPUT AND OUTPUT CAPACITOR
INRUSH CURRENT LIMIT
BOARD LAYOUT RECOMMENDATIONS TO
TPS720xx
www.ti.com........................................................................................................................................................ SBVS100D – JUNE 2008 – REVISED AUGUST 2009
ground connection for the output capacitor should be
The TPS720xx belongs to a family of new generation
connected directly to the GND pin of the device. High
LDO regulators that use innovative circuitry to
equivalent series resistance (ESR) capacitors may
achieve ultra-wide bandwidth and high loop gain,
degrade PSRR. The BIAS pin draws very little current
resulting in extremely high PSRR (up to 1MHz) at
and can be routed as a signal (make sure to shield it
very low headroom (VIN – VOUT). The implementation
from high-frequency coupling).
of the BIAS pin on the TPS720xx vastly improves
efficiency of low VOUT applications by allowing the use
of a preregulated, low-voltage input supply. The
TPS720xx supports a novel feature in which the
The TPS720xx internal current limits help protect the
output of the LDO regulates under light loads
regulator during fault conditions. During current limit,
(<500
µA) when the IN pin is left floating. The
the output sources a fixed amount of current that is
light-load drive current is sourced from VBIAS under
largely independent of output voltage. In such a case,
this condition. This feature is particularly useful in
the
output
voltage
is
not
regulated,
and
is
power-saving applications where the dc/dc converter
VOUT = ILIMIT × RLOAD. The NMOS pass transistor
connected to the IN pin is disabled but the LDO is still
dissipates (VIN – VOUT) × ILIMIT until thermal shut down
required to regulate the voltage to a light load. These
is triggered and the device is turned off. As the
features, combined with low noise, low ground pin
device cools down, it is turned on by the internal
current, and ultra-small packaging, make this device
thermal
shutdown
circuit.
If
the
fault
condition
ideal
for
portable
applications.
This
family
of
continues, the device cycles between current limit
regulators
offers
sub-bandgap
output
voltages,
and thermal shutdown. See the Thermal Information
current limit and thermal protection, and is fully
section for more details.
specified from –40°C to +125°C.
The NMOS pass element in the TPS720xx has a
built-in body diode that conducts current when the
voltage at OUT exceeds the voltage at IN. This
REQUIREMENTS
current is not limited, so if extended reverse voltage
Although an input capacitor is not required for stability
operation is anticipated, external limiting to 5% of
on the IN pin, it is good analog design practice to
rated output current is recommended.
connect a 0.1
µF to 1.0µF low equivalent series
resistance (ESR) capacitor across the IN pin input
supply near the regulator. This capacitor counteracts
The TPS720xx family of LDO regulators implement a
reactive
input
sources
and
improves
transient
novel inrush current-limit circuit architecture: the
response, noise rejection, and ripple rejection. A
current drawn through the IN pin is limited to a finite
higher-value capacitor may be necessary if large, fast
value. This IINRUSHLIMIT charges the output to its final
rise-time load transients are anticipated, or if the
voltage. All the current drawn through VIN goes to
device is located close to the power source. If source
charge the output capacitance when the load is
impedance is not sufficiently low, a 0.1
µF input
disconnected. The following equation shows the
capacitor may be necessary to ensure stability.
inrush current limit performed by the circuit:
The BIAS pin does not require an input capacitor
IINRUSHLIMIT(A) = COUT(µF) × 0.0454545(V/µs) +
because it does not source high currents. However, if
ILOAD(A)
(1)
source impedance is not sufficiently low, a small
0.1
µF bypass capacitor is recommended.
Assuming a COUT of 2.2µF with the load disconnected
(that is, ILOAD = 0) the IINRUSHLIMIT is calculated to be
The TPS720xx is designed to be stable with standard
100mA. The inrush current charges the LDO output
ceramic capacitors with values of 2.2
µF or larger at
capacitor. If the output of the LDO regulates to 1.3V,
the output. X5R- and X7R-type capacitors are best
then the LDO charges the output capacitor to the final
because they have minimal variation in value and
output value in approximately 28.6
µs.
ESR over temperature. Maximum ESR should be less
than 250m
Ω.
Another consideration is when a load is connected to
the output of an LDO. The connected load tries to
steer a portion of the current away from VOUT. The
TPS720xx inrush current-limit circuit employs a new
IMPROVE PSRR AND NOISE PERFORMANCE
technique that supplies not only the IINRUSHLIMIT, but
To improve ac performance such as PSRR, output
also the additional current needed by the load. If
noise, and transient response, it is recommended that
ILOAD = 350mA, then the IINRUSHLIMIT calculates to be
the board be designed with separate ground planes
approximately 450mA (from Equation 1).
for VIN and VOUT, with the ground plane connected
only at the GND pin of the device. In addition, the
Copyright © 2008–2009, Texas Instruments Incorporated
Submit Documentation Feedback
11


Similar Part No. - TPS72017YZUR

ManufacturerPart #DatasheetDescription
logo
Texas Instruments
TPS72017YZUR TI-TPS72017YZUR Datasheet
926Kb / 22P
[Old version datasheet]   350mA, Ultra-Low VIN, RF Low-Dropout Linear Regulator with Bias Pin
TPS72017YZUR TI-TPS72017YZUR Datasheet
741Kb / 21P
[Old version datasheet]   350mA, Ultra-Low VIN, RF Low-Dropout Linear Regulator with Bias Pin
TPS72017YZUR TI-TPS72017YZUR Datasheet
1Mb / 25P
[Old version datasheet]   350mA, Ultra-Low VIN, RF Low-Dropout Linear Regulator with Bias Pin
TPS72017YZUR TI1-TPS72017YZUR Datasheet
1Mb / 33P
[Old version datasheet]   350 mA, Ultra-Low VIN, RF Low-Dropout Linear Regulator With Bias Pin
TPS72017YZUR TI1-TPS72017YZUR Datasheet
983Kb / 28P
[Old version datasheet]   350 mA, Ultra-Low VIN, RF Low-Dropout Linear Regulator With Bias Pin
More results

Similar Description - TPS72017YZUR

ManufacturerPart #DatasheetDescription
logo
Texas Instruments
TPS72011 TI-TPS72011 Datasheet
1Mb / 25P
[Old version datasheet]   350mA, Ultra-Low VIN, RF Low-Dropout Linear Regulator with Bias Pin
TPS720 TI-TPS720 Datasheet
552Kb / 19P
[Old version datasheet]   350mA, Ultra-Low VIN, RF Low-Dropout Linear Regulator with Bias Pin
TPS720XX TI-TPS720XX Datasheet
741Kb / 21P
[Old version datasheet]   350mA, Ultra-Low VIN, RF Low-Dropout Linear Regulator with Bias Pin
TPS720XX_0809 TI-TPS720XX_0809 Datasheet
926Kb / 22P
[Old version datasheet]   350mA, Ultra-Low VIN, RF Low-Dropout Linear Regulator with Bias Pin
TPS720 TI1-TPS720_17 Datasheet
1Mb / 33P
[Old version datasheet]   350 mA, Ultra-Low VIN, RF Low-Dropout Linear Regulator With Bias Pin
TPS720 TI1-TPS720_18 Datasheet
983Kb / 28P
[Old version datasheet]   350 mA, Ultra-Low VIN, RF Low-Dropout Linear Regulator With Bias Pin
TPS720 TI-TPS720_15 Datasheet
1Mb / 31P
[Old version datasheet]   TPS720 350 mA, Ultra-Low VIN, RF Low-Dropout Linear Regulator With Bias Pin
logo
SHANGHAI BELLING CO., L...
BL8074 BELLING-BL8074 Datasheet
1,008Kb / 5P
   800mA Ultra-Low Vin Low Dropout Voltage Linear Regulator
logo
ACE Technology Co., LTD...
ACE518C ACE-ACE518C Datasheet
407Kb / 8P
   1A Ultra-Low Vin Low Dropout Voltage Linear Regulator
VER 1.1
logo
SHANGHAI BELLING CO., L...
BL8073 BELLING-BL8073 Datasheet
995Kb / 5P
   1A Ultra-Low Vin Low Dropout Voltage Linear Regulator
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25


Datasheet Download

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEET.NET
Does ALLDATASHEET help your business so far?  [ DONATE ] 

About Alldatasheet   |   Advertisement   |   Contact us   |   Privacy Policy   |   Link Exchange   |   Manufacturer List
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