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ADP3301AR-3.2 bảng dữ liệu(PDF) 7 Page - Analog Devices |
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ADP3301AR-3.2 bảng dữ liệu(HTML) 7 Page - Analog Devices |
7 / 8 page ADP3301 –7– REV. 0 It is not recommended to use solder mask or silkscreen on the PCB traces adjacent to the ADP3301’s pins since it will increase the junction to ambient thermal resistance of the package. Shutdown Mode Applying a TTL high signal to the shutdown pin, or tying it to the input pin, will turn the output ON. Pulling the shutdown pin low, or tying it to ground, will turn the output OFF. In shutdown mode, quiescent current is reduced to less than 1 µA. Error Flag Dropout Detector The ADP3301 will maintain its output voltage over a wide range of load, input voltage and temperature conditions. If, for example, regulation is lost by reducing the supply voltage below the combined regulated output and dropout voltages, the ERRor flag will be activated. The ERR output is an open collector, which will be driven low. Once set, the ERRor flag’s hysteresis will keep the output low until a small margin of operating range is restored either by raising the supply voltage or reducing the load. APPLICATION CIRCUITS Crossover Switch The circuit in Figure 21 shows that two ADP3301s can be used to form a mixed supply voltage system. The output switches between two different levels selected by an external digital input. Output voltages can be any combination of voltages from the Ordering Guide. Higher Output Current The ADP3301 can source up to 100 mA without any heatsink or pass transistor. If higher current is needed, an appropriate pass transistor can be used, as in Figure 22, to increase the output current to 1 A. Step-Up/Step-Down Post Regulator The circuit in Figure 23 provides a high precision, low dropout regulated output voltage. It significantly reduces the ripple from a switching regulator. The ADP3000 used in this circuit is a switching regulator in the step-up configuration. D1 1N5817 C2 100µF 10V L1 6.8µH R1 120 Ω R2 19.6k Ω 1% R3 10k Ω 1% ADP3301-3.3 IN OUT GND C3 2.2µF 3.3V @ 100mA C1 100µF 10V ADP3000-ADJ ILIM VIN SW1 GND SW2 FB VIN = 2.5V TO 3.5V Figure 23. Step-Up/Step-Down Post Regulator VOUT = 5V/3.3V VIN = 5.5V TO 12V OUTPUT SELECT 5V 0V C2 0.47µF IN OUT GND SD ADP3301-5.0 + + IN OUT GND SD ADP3301-3.3 C1 1.0µF Figure 21. Crossover Switch VIN = 6V TO 8V VOUT = 5V @ 1A MJE253* C2 10µF C1 47µF R1 50 Ω *AAVID531002 HEAT SINK IS USED IN OUT ERR GND SD ADP3301-5 Figure 22. High Output Current Linear Regulator |
Số phần tương tự - ADP3301AR-3.2 |
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Mô tả tương tự - ADP3301AR-3.2 |
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