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TPS79533DCQR Fiches technique(PDF) 10 Page - Texas Instruments

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No de pièce TPS79533DCQR
Description  ULTRALOW-NOISE, HIGH PSRR, FAST RF 500-mA LOW-DROPOUT LINEAR REGULATORS
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS79533DCQR Fiches technique(HTML) 10 Page - Texas Instruments

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Programming the TPS79501 Adjustable LDO
C1 +
(3 x 10–7) x (R1 ) R2)
(R1 x R2)
(3)
V
OUT
+ VREF
1 )
R1
R2
(1)
Regulator Protection
R1 +
V
OUT
V
REF
* 1
R2
(2)
OUTPUT VOLTAGE
PROGRAMMING GUIDE
OUTPUT
VOLTAGE
R1
R2
C1
GND
NR
FB
IN
OUT
EN
V
IN
V
OUT
R1
C1
R2
1
µF
0.01
µF
TPS79501
1
µF
1.8 V
3.6V
14.0 k
61.9 k
30.1 k
30.1 k
22 pF
15 pF
TPS79501, TPS79516
TPS79518, TPS79525
TPS79530, TPS79533
SLVS350C – OCTOBER 2002 – REVISED JANUARY 2005
Regulator
The output voltage of the TPS79501 adjustable
The suggested value of this capacitor for several
regulator is programmed using an external resistor
resistor ratios is shown in the table below. If this
divider as shown in Figure 24. The output voltage is
capacitor is not used (such as in a unity-gain con-
calculated using Equation 1:
figuration) then the minimum recommended output
capacitor is 2.2 µF instead of 1 µF.
where:
The TPS795xx PMOS-pass transistor has a built-in
VREF = 1.2246 V typ (the internal reference
back diode that conducts reverse current when the
voltage)
input voltage drops below the output voltage (e.g.,
Resistors R1 and R2 should be chosen for approxi-
during power down). Current is conducted from the
mately 40-µA divider current. Lower value resistors
output to the input and is not internally limited. If
can be used for improved noise performance, but the
extended reverse voltage operation is anticipated,
device wastes more power. Higher values should be
external limiting might be appropriate.
avoided, as leakage current at FB increases the
The TPS795xx features internal current limiting and
output voltage error. The recommended design pro-
thermal protection. During normal operation, the
cedure is to choose R2 = 30.1 k
Ω to set the divider
TPS795xx limits output current to approximately 2.8
current at 40 µA, C1 = 15 pF for stability, and then
A. When current limiting engages, the output voltage
calculate R1 using Equation 2:
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.
In order to improve the stability of the adjustable
If the temperature of the device exceeds approxi-
version, it is suggested that a small compensation
mately 165
°C, thermal-protection circuitry shuts it
capacitor be placed between OUT and FB. The
down. Once the device has cooled down to below
approximate value of this capacitor can be calculated
approximately 140
°C, regulator operation resumes.
as Equation 3:
Figure 24. TPS79501 Adjustable LDO Regulator Programming
10


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