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ADP3308ART-2.7 Datasheet(PDF) 7 Page - Analog Devices |
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ADP3308ART-2.7 Datasheet(HTML) 7 Page - Analog Devices |
7 / 8 page ADP3308 –7– REV. B The following general guidelines will be helpful when designing a board layout: 1. PC board traces with larger cross section areas will remove more heat. For optimum results, use PC boards with thicker copper and or wider traces. 2. Increase the surface area exposed to open air so heat can be removed by convection or forced air flow. 3. Do not use solder mask or silk screen on the heat dissipating traces because 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 down to a TTL low signal or tying it to ground will turn the output OFF. In shutdown mode, quiescent current is reduced to less than 1 µA. APPLICATION CIRCUITS Crossover Switch The circuit in Figure 3 shows that two ADP3308s 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. ADP3308-3.0 OUT IN GND OUTPUT SELECT 4V 0V SD C1 1.0 F ADP3308-3.3 OUT IN GND SD C2 0.47 F VOUT = 3.0V/3.3V VIN = 4V TO 12V Figure 3. Crossover Switch D1 1N5817 C2 100 F 10V L1 6.8 H R1 120 C3 2.2 F 3.0V@50mA C1 100 F 10V VIN = 2.5V TO 3.5V R2 30.1k 1% Q1 2N3906 Q2 2N3906 R4 274k R3 124k 1% ADP3000-ADJ ILIM VIN SW1 GND SW2 FB ADP3308-3.0 IN SD OUT GND Figure 5. Constant Dropout Post Regulator Higher Output Current The ADP3308 can source up to 50 mA without any heatsink or pass transistor. If higher current is needed, an appropriate pass transistor can be used, as in Figure 4, to increase the output current to 1 A. VIN = 4V TO 8V VOUT = 3.0V @ 1A MJE253* C1 47 F R1 50 *AAVID531002 HEAT SINK IS USED ADP3308-3.0 GND SD C2 10 F IN OUT Figure 4. Higher Output Current Linear Regulator Constant Dropout Post Regulator The circuit in Figure 5 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. |
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