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TPS71550QDCKRQ1 Datasheet(PDF) 9 Page - Texas Instruments

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No. de pieza TPS71550QDCKRQ1
Descripción Electrónicos  Supply Current Low-Dropout Linear Regulators
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

TPS71550QDCKRQ1 Datasheet(HTML) 9 Page - Texas Instruments

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1.8 V
2.8 V
5 V
OUTPUT VOLTAGE
PROGRAMMING GUIDE
OUTPUT
VOLTAGE
R1
R2
3.16 MW
1 MW
1 MW
1 MW
VO
VI
FB
R1
R2
GND
IN
TPS71501
0.1 µF
0.47 µF
OUT
1.33 MW
0.499 MW
O
ref
V
R1
1
R2
V
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´
ç
÷
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ref
R1
V
V
1
R2
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9
TPS71501-Q1, TPS71525-Q1, TPS71530-Q1, TPS71533-Q1, TPS71550-Q1
www.ti.com
SGLS272H – OCTOBER 2004 – REVISED DECEMBER 2015
Product Folder Links: TPS71501-Q1 TPS71525-Q1 TPS71530-Q1 TPS71533-Q1 TPS71550-Q1
Submit Documentation Feedback
Copyright © 2004–2015, Texas Instruments Incorporated
8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The TPS715xx-Q1 family of LDO regulators has been optimized for ultra-low power applications such as the
MSP430 microcontroller. Its ultralow supply current maximizes efficiency at light loads and its high input voltage
range makes it suitable for supplies such as unconditioned solar panels.
8.1.1 Programming the TPS71501 Adjustable LDO Regulator
The output voltage of the TPS71501 adjustable regulator is programmed using an external resistor divider as
shown in Figure 15. The output voltage is calculated using Equation 1.
where
VREF = 1.205 V typ (the internal reference voltage)
(1)
Resistors R1 and R2 should be chosen for approximately 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 as leakage current into/out of FB across R1/R2 creates an offset voltage that artificially
increases/decreases the feedback voltage and thus erroneously decreases/increases VO. The recommended
design procedure is to choose R2 = 1 M
Ω to set the divider current at 1.5 μA and then calculate R1 using
Equation 2.
(2)
Figure 15. TPS71501 Adjustable LDO Regulator Programming


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