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TPS7A03 Scheda tecnica(PDF) 26 Page - Texas Instruments

Il numero della parte TPS7A03
Spiegazioni elettronici  TPS7A03 Nanopower IQ, 200-nA, 200-mA, Low-Dropout Voltage Regulator With Fast Transient Response
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TPS7A03 Scheda tecnica(HTML) 26 Page - Texas Instruments

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Load
V
BAT
IN
OUT
EN
GND
Device
C
IN
C
OUT
Rated output
current
Output current limited by
dropout
Output current limited by thermals
Limited by
minimum VIN
Limited by
maximum VIN
VIN ± VOUT (V)
26
TPS7A03
SBVS375B – JULY 2019 – REVISED APRIL 2020
www.ti.com
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Copyright © 2019–2020, Texas Instruments Incorporated
Application Information (continued)
Figure 61 shows the recommended area of operation for this device on a JEDEC-standard high-K board with a
RθJA as given in the Thermal Information table.
Figure 61. Region Description of Continuous Operation Regime
8.2 Typical Application
Figure 62. Operation From a Battery Input Supply
8.2.1 Design Requirements
Table 2. Design Parameters
PARAMETER
DESIGN REQUIREMENT
Input voltage
1.8 V to 3.0 V (two 1.5-V batteries)
Output voltage
1.0 V, ±1%
Input current
200 mA, maximum
Output load
10-mA DC
Maximum ambient temperature
70°C
8.2.2 Detailed Design Procedure
For this design example, the 1.0-V, fixed-version TPS7A0310 is selected. A dual AA Alkaline battery was used,
thus a 1.0-µF input capacitor is recommended to minimize transient currents drawn from the battery. A 1.0-µF
output capacitor is also recommended for excellent load transient response. The dropout voltage (VDO) is kept
within the TPS7A02 dropout voltage specification for the 1.0-V output voltage option to keep the device in
regulation under all load and temperature conditions for this design. Use the recommend 1-µF input and output
capacitor because the input source has a high equivalent series resistor (ESR) of 600 mΩ (typ). The very small
ground current consumed by the regulator maintains a high current efficiency as compared to the load current
consumed by the system, as shown in Figure 63 which allows for long battery life. Equation 6 can be used to
calculate the current efficiency (Iη) of this system.
Iη(%) = IOUT / (IOUT + IQ) × 100
(6)


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