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ADP3303AR-3 Datasheet(PDF) 8 Page - Analog Devices |
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ADP3303AR-3 Datasheet(HTML) 8 Page - Analog Devices |
8 / 8 page ADP3303 –8– REV. A OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 8-Lead Small Outline IC (SO-8) 0.1968 (5.00) 0.1890 (4.80) 8 5 4 1 0.2440 (6.20) 0.2284 (5.80) PIN 1 0.1574 (4.00) 0.1497 (3.80) 0.0688 (1.75) 0.0532 (1.35) SEATING PLANE 0.0098 (0.25) 0.0040 (0.10) 0.0192 (0.49) 0.0138 (0.35) 0.0500 (1.27) BSC 0.0098 (0.25) 0.0075 (0.19) 0.0500 (1.27) 0.0160 (0.41) 8 ° 0 ° 0.0196 (0.50) 0.0099 (0.25) x 45 ° ADP3303-5.0 OUT IN GND OUTPUT SELECT 5V 0V C1 1.0 F ADP3303-3.3 OUT IN GND C2 0.47 F VOUT = 5V/3.3V VIN = 5.5V TO 12V SD SD Figure 23. Crossover Switch Higher Output Current The ADP3303 can source up to 200 mA without any heatsink 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. VIN = 6V TO 8V VOUT = 5V @ 1A MJE253* C2 10 F C1 47 F R1 50 *AAVID531002 HEATSINK IS USED IN OUT ERR GND SD ADP3303-5 Figure 24. High Output Current Linear Regulator Constant Dropout Post Regulator The circuit in Figure 25 provides high precision with low drop- out 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 60 mW. The ADP3000 used in this circuit is a switching regulator in the step-up configuration. D1 1N5817 C2 100 F 10V L1 6.8 H R1 120 ADP3303-3.3 IN SD OUT GND C3 2.2 F 3.3V @ 160mA C1 100 F 10V ADP3000-ADJ ILIM VIN SW1 GND SW2 FB VIN = 2.5V TO 3.5V R2 30.1k 1% Q1 2N3906 Q2 2N3906 R4 274k R3 124k 1% Figure 25. Constant Dropout Post Regulator |
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