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TPS73033DBVRG4 Datasheet(PDF) 11 Page - Texas Instruments

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Part # TPS73033DBVRG4
Description  Low-Noise, High PSRR, RF, 200-mA Low-Dropout Linear Regulators
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS73033DBVRG4 Datasheet(HTML) 11 Page - Texas Instruments

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GND
NR
FB
IN
OUT
EN
V
IN
V
OUT
R
1
C
1
R
2
1 F
m
2.2 F
m
0.01 F
m
TPS73001
OUTPUTVOLTAGE
PROGRAMMINGGUIDE
R
1
R
2
C
1
2.5V
3.3V
3.6V
1.22V
OUTPUT
VOLTAGE
31.6kW
short
51kW
59kW
open
30.1kW
30.1kW
30.1kW
0pF
22pF
15pF
15pF
7
1
2
1
1
2
( 3
1 0
)
(R
R
)
C
(R
R
)

u
u

u
R =
1
- 1 ´ R2
V
OUT
V
REF
1
O U T
R E F
2
R
V
V
1
R
§
·
u

¨
¸
©
¹
TPS730
www.ti.com
SBVS054J – NOVEMBER 2004 – REVISED APRIL 2015
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 TPS730 family of low-dropout (LDO) regulators has been optimized for use in noise-sensitive battery-
operated equipment. The device features extremely low dropout voltages, high PSRR, ultra-low output noise, low
quiescent current (170
μA typically), and enable-input to reduce supply currents to less than 1 μA when the
regulator is turned off.
8.1.1 Adjustable Operation
The output voltage of the TPS73001 adjustable regulator is programmed using an external resistor divider as
shown in Figure 17. The output voltage is calculated using Equation 1:
Where:
VREF = 1.225 V typical (the internal reference voltage)
(1)
Resistors R1 and R2 should be chosen for approximately 50-μA divider current. Lower value resistors can be
used for improved noise performance, but the solution consumes more power. Higher resistors values can cause
accuracy issues and other problems. The recommended design procedure is to choose R2 = 30.1 kΩ to set the
divider current at 50
μA, C1 = 15 pF for stability, and then calculate R1 using Equation 2:
(2)
To improve the stability of the adjustable version, TI suggests placing a small compensation capacitor between
OUT and FB. For output voltages < 1.8 V, the value of this capacitor should be 100 pF. For output voltages > 1.8
V, use Equation 3 to calculate the approximate value of this capacitor.
(3)
Figure 17 shows the suggested value of this capacitor for several resistor ratios. If this capacitor is not used
(such as in a unity-gain configuration) or if an output voltage < 1.8 V is chosen, then the minimum recommended
output capacitor is 4.7
μF instead of 2.2 μF.
Figure 17. TPS73001 Adjustable LDO Regulator Programming
Copyright © 2004–2015, Texas Instruments Incorporated
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