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TPS79628KTT Fiches technique(PDF) 10 Page - Texas Instruments

No de pièce TPS79628KTT
Description  ULTRALOW-NOISE, HIGH PSRR, FAST RF 1-A LOW-DROPOUT LINEAR REGULATORS
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
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TPS79628KTT Fiches technique(HTML) 10 Page - Texas Instruments

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Regulator Protection
R1 +
V
O
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
NR
FB
IN
OUT
EN
V
IN
V
OUT
R1
C1
R2
0.01
µF
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
TPS79601, TPS79618, TPS79625
TPS79628, TPS79630, TPS79633
SLVS351D – SEPTEMBER 2002 – REVISED OCTOBER 2004
The recommended design procedure is to choose
R2 = 30.1 k
Ω to set the divider current at 40 µA, C1 =
The TPS796xx PMOS-pass transistor has a built-in
15 pF 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
The TPS796xx features internal current limiting and
version, it is suggested that a small compensation
thermal protection. During normal operation, the
capacitor be placed between OUT and FB. The
TPS796xx limits output current to approximately 2.8
approximate value of this capacitor can be calculated
A. When current limiting engages, the output voltage
as Equation 3:
scales back linearly until the overcurrent condition
ends. While current limiting is designed to prevent
gross device failure, care should be taken not to
exceed the power dissipation ratings of the package.
The suggested value of this capacitor for several
If the temperature of the device exceeds approxi-
resistor ratios is shown in the table below (see
mately 165
°C, thermal-protection circuitry shuts it
Figure 23). If this capacitor is not used (such as in a
down. Once the device has cooled down to below
unity-gain configuration) then the minimum rec-
approximately 140
°C, regulator operation resumes.
ommended output capacitor is 2.2 µF instead of 1 µF.
Figure 23. TPS79601 Adjustable LDO Regulator Programming
10


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