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TPS71433DRVR Fiches technique(PDF) 8 Page - Texas Instruments

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No de pièce TPS71433DRVR
Description  80mA, 10V, 3.2mA Quiescent Current LOW-DROPOUT LINEAR REGULATOR in SC70 or SON 2x2
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

TPS71433DRVR Fiches technique(HTML) 8 Page - Texas Instruments

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Programming the TPS71401 Adjustable LDO Regulator
V
OUT + VREF
1 )
R1
R2
(3)
R1 +
V
OUT
V
REF
* 1
R2
(4)
OUTPUTVOLTAGE
PROGRAMMINGGUIDE
OUTPUT
VOLTAGE
R1
R2
1.8V
2.8V
5.0V
392MW
1.07MW
2.55MW
806kW
806kW
806kW
V
IN
FB
GND
IN
0.1 F
m
TPS71401
OUT
0.47 F
m
V
OUT
R1
R2
TPS714xx
SBVS116 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com
The output voltage of the TPS71401 adjustable regulator is programmed using an external resistor divider as
shown in Figure 16. The output voltage is calculated using Equation 3:
where:
VREF = 1.205V typ (the internal reference voltage)
Resistors R1 and R2 should be chosen for approximately a 1.5
µA divider current. Lower value resistors can be
used for improved noise performance, but the solution consumes more power. Higher resistor values should be
avoided because leakage current out of the FB pin across R1/R2 creates an offset voltage that artificially
increases the feedback voltage and thus erroneously decreases VOUT. The recommended design procedure is to
choose R2 = 1M
Ω to set the divider current at 1.5
µA, and then calculate R1 using Equation 4:
Figure 16. TPS71401 Adjustable LDO Regulator Programming
8
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Copyright © 2008, Texas Instruments Incorporated


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