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TPS79501DCQR Datasheet(PDF) 9 Page - Texas Instruments

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Part # TPS79501DCQR
Description  ULTRALOW-NOISE, HIGH-PSRR, FAST, RF, 500-mA LOW-DROPOUT LINEAR REGULATORS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

TPS79501DCQR Datasheet(HTML) 9 Page - Texas Instruments

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PROGRAMMING THE TPS79501
C
1
+
(3
10*7)
(R
1
) R2)
(R
1
R
2)
(3)
V
OUT + VREF
1 )
R
1
R
2
(1)
REGULATOR PROTECTION
R
1
+
V
OUT
V
REF
* 1
R
2
(2)
TPS79501
GND
FB
IN
OUT
EN
V
IN
V
OUT
R
1
C
1
R
2
1 F
m
1 F
m
OUTPUTVOLTAGE
PROGRAMMINGGUIDE
1.8V
3.6V
14.0k
W
57.9k
W
30.1k
W
30.1k
W
33pF
15pF
OUTPUT
VOLTAGE
R
1
R
2
C
1
TPS795xx
SLVS350G – OCTOBER 2002 – REVISED JULY 2006
The approximate value of this capacitor can be
ADJUSTABLE LDO REGULATOR
calculated as Equation 3:
The output voltage of the TPS79501 adjustable
regulator is programmed using an external resistor
divider as shown in Figure 24. The output voltage is
The suggested value of this capacitor for several
calculated using Equation 1:
resistor ratios is shown in the table within Figure 24.
If this capacitor is not used (such as in a unity-gain
configuration), then the minimum recommended
output capacitor is 2.2
µF instead of 1 µF.
where:
VREF = 1.2246 V typ (the internal reference
voltage)
The TPS795xx PMOS-pass transistor has a built-in
back diode that conducts reverse current when the
Resistors
R1 and R2 should be chosen for
input voltage drops below the output voltage (for
approximately 40-
µA divider current. Lower value
example, during power down). Current is conducted
resistors
can
be
used
for
improved
noise
from the output to the input and is not internally
performance, but the device wastes more power.
limited. If extended reverse voltage operation is
Higher values should be avoided, as leakage current
anticipated, external limiting might be appropriate.
at FB increases the output voltage error.
The TPS795xx features internal current limiting and
The recommended design procedure is to choose
thermal protection. During normal operation, the
R2 = 30.1 kΩ to set the divider current at 40 µA,
TPS795xx limits output current to approximately 2.8
C1 = 15 pF for stability, and then calculate R1 using
A. When current limiting engages, the output voltage
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
version, it is suggested that a small compensation
approximately
165
°C, thermal-protection circuitry
capacitor be placed between OUT and FB.
shuts it down. Once the device has cooled down to
below
approximately
140
°C, regulator operation
resumes.
Figure 24. TPS79501 Adjustable LDO Regulator Programming
9
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