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TPS7A03 Scheda tecnica(PDF) 26 Page - Texas Instruments |
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TPS7A03 Scheda tecnica(HTML) 26 Page - Texas Instruments |
26 / 43 page 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 Submit Documentation Feedback 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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