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TPS79633KTTRG3 Datasheet(PDF) 9 Page - Texas Instruments

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No. de pieza TPS79633KTTRG3
Descripción Electrónicos  ULTRALOW-NOISE, HIGH PSRR, FAST, RF, 1A LOW-DROPOUT LINEAR REGULATORS
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Fabricante Electrónico  TI [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS79633KTTRG3 Datasheet(HTML) 9 Page - Texas Instruments

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Regulator Protection
R1 +
V
OUT
V
REF
*1
R2
(2)
C1 +
(3 x 10–7) x (R1 ) R2)
(R1 x R2)
(3)
OUTPUT VOLTAGE
PROGRAMMING GUIDE
OUTPUT
VOLTAGE
R1
R2
C1
GND
FB
IN
OUT
EN
V
IN
V
OUT
R1
C1
R2
TPS79601
1
µF
1.8 V
3.6V
14.0 k
57.9 k
30.1 k
30.1 k
33 pF
15 pF
2.2
µF
TPS796xx
SLVS351I – SEPTEMBER 2002 – REVISED MAY 2006
The recommended design procedure is to choose
R2 = 30.1k
Ω to set the divider current at 40µA, C1 =
The TPS796xx PMOS-pass transistor has a built-in
15pF for stability, and then calculate R1 using
back diode that conducts reverse current when the
Equation 2:
input voltage drops below the output voltage (e.g.,
during power-down). Current is conducted from the
output to the input and is not internally limited. If
extended reverse voltage operation is anticipated,
external limiting might be appropriate.
In order to improve the stability of the adjustable
version, it is suggested that a small compensation
The TPS796xx features internal current limiting and
capacitor be placed between OUT and FB. The
thermal protection. During normal operation, the
approximate value of this capacitor can be calculated
TPS796xx limits output current to approximately
as Equation 3:
2.8A. When current limiting engages, the output
voltage scales back linearly until the overcurrent
condition ends. While current limiting is designed to
prevent gross device failure, care should be taken
The suggested value of this capacitor for several
not to exceed the power dissipation ratings of the
resistor ratios is shown in the table below (see
package. If the temperature of the device exceeds
Figure 23). If this capacitor is not used (such as in a
approximately +165
°C, thermal-protection circuitry
unity-gain
configuration)
then
the
minimum
shuts it down. Once the device has cooled down to
recommended output capacitor is 2.2
µF instead of
below approximately +140
°C, regulator operation
1
µF.
resumes.
Figure 23. TPS79601 Adjustable LDO Regulator Programming
9
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