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TPS79927-Q1 Fiches technique(PDF) 11 Page - Texas Instruments

No de pièce TPS79927-Q1
Description  200 mA, Low Quiescent Current, Ultralow Noise, High PSRR, Low Dropout, Linear Regulators
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

TPS79927-Q1 Fiches technique(HTML) 11 Page - Texas Instruments

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background image
TPS79901
GND
EN
FB
IN
OUT
V
IN
V
OUT
R
1
C
FB
R
2
Optionalinputcapacitor.
Mayimprovesource
impedance,noise,orPSRR.
V
=
OUT
´
1.193
(R
1
2
+R )
R
2
V
EN
2.2 F
m
Ceramic
TPS799xx
GND
EN
NR
IN
OUT
V
IN
V
OUT
Optional input capacitor.
May improve source
impedance, noise, or PSRR.
Optional bypass capacitor
to reduce output noise
and increase PSRR.
2.2µF
Ceramic
V
EN
TPS799-Q1
www.ti.com
SBVS097F – MARCH 2008 – REVISED JUNE 2015
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The TPS799xx-Q1 family of LDO regulators combines the high performance required of many RF and precision
analog applications with ultralow current consumption. High PSRR is provided by a high gain, high bandwidth
error loop with good supply rejection at very low headroom (VIN – VOUT). Fixed-voltage versions provide a noise
reduction pin to bypass noise generated by the bandgap reference and to improve PSRR while a quick-start
circuit fast-charges this capacitor at start-up. The combination of high performance and low ground current also
make the TPS799xx-Q1 an excellent choice for portable applications. All versions have thermal and overcurrent
protection and are fully specified from –40°C to 125°C.
Figure 12 shows the basic circuit connections for fixed-voltage model. Figure 13 gives the connections for the
adjustable output version (TPS79901). R1 and R2 can be calculated for any output voltage using the formula in
Figure 13. Sample resistor values for common output voltages are shown in Figure 13.
8.2 Typical Application
Figure 12. Typical Application Circuit for
Fixed-Voltage Version
Figure 13. Typical Application Circuit for
Adjustable-Voltage Version
Copyright © 2008–2015, Texas Instruments Incorporated
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