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ADP3309ART-3-REEL7 Arkusz danych(PDF) 11 Page - Analog Devices |
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ADP3309ART-3-REEL7 Arkusz danych(HTML) 11 Page - Analog Devices |
11 / 12 page ADP3309 Rev. C | Page 11 of 12 APPLICATION CIRCUITS CROSSOVER SWITCH The circuit in Figure 23 shows that two ADP3309s 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 of the data sheet. + + ADP3309-2.7 ADP3309-3.3 IN OUT SD IN OUT SD GND GND VIN = 4V TO 12V 4V 0V OUTPUT SELECT C1 1µF C2 0.47µF VOUT = 2.7V/3.3V Figure 23. Crossover Switch HIGHER OUTPUT CURRENT The ADP3309 can source up to 100 mA without any heat sink or pass transistor. If higher current is needed, an appropriate pass transistor can be used, as in Figure 24, to increase the output current to 1 A. + ADP3309-3.3 IN OUT SD GND VIN = 4V TO 8V C1 47µF C2 10µF VOUT = 3.3V @ 1A ERR R1 50Ω MJE253* *AAVID531002 HEAT SINK IS USED Figure 24. Higher Output Current Linear Regulator CONSTANT DROPOUT POST REGULATOR The circuit in Figure 25 provides high precision with low dropout for any regulated output voltage. It significantly reduces the ripple from a switching regulator while providing a constant dropout voltage, which limits the power dissipation of the LDO to 30 mW. The ADP3000 used in this circuit is a switching regulator in the step-up configuration. + ADP3309-3.3 IN OUT SD GND VIN = 2.5V TO 3.5V C3 2.2µF VOUT = 3.3V @ 100mA R1 120Ω C1 100µF 10V L1 6.8µF D1 1N5817 ADP3000-ADJ ILIM VIN SW1 FB SW2 GND C2 100µF 10V Q1 2N3906 R2 30.1kΩ 1% R3 124kΩ 1% Q2 2N3906 R4 274kΩ Figure 25. Constant Dropout Post Regulator |
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