Datasheet > ADP3308

ADP3308

更新时间： 2022-12-12 23:21:52

品牌	Logo	应用领域
亚德诺 - ADI		稳压器
页数	文件大小	规格书
8页	118K
描述
anyCAP⑩ 50 mA Low Dropout Linear Regulator

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ADP3308 数据手册

ADP3308

Higher Output Current

The following general guidelines will be helpful when designing

a board layout:

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 22, to increase the output

current to 1 A.

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.

MJE253*

2. Increase the surface area exposed to open air so heat can be

removed by convection or forced air flow.

= 3.0V @ 1A

= 4V TO 8V

OUT

47␮F

50⍀

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.

OUT

10␮F

ADP3308-3.0

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.

GND

*AAVID531002 HEAT SINK IS USED

Figure 22. Higher Output Current Linear Regulator

Constant Dropout Post Regulator

APPLICATION CIRCUITS

Crossover Switch

The circuit in Figure 23 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 30 mW. The ADP3000 used in this circuit is a switching

regulator in the step-up configuration.

The circuit in Figure 21 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.

= 4V TO 12V

= 3.0V/3.3V

OUT

ADP3308-3.0

OUT

OUTPUT SELECT

GND

ADP3308-3.3

OUT

1.0␮F

0.47␮F

GND

Figure 21. Crossover Switch

1N5817

6.8␮H

ADP3308-3.0

OUT

= 2.5V TO 3.5V

3.0V@50mA

100␮F

10V

120⍀

100␮F

10V

30.1k⍀

GND

2.2␮F

LIM

SW1

2N3906

ADP3000-ADJ

274k⍀

GND

SW2

124k⍀

Figure 23. Constant Dropout Post Regulator

REV. A

–7–

1...4 5 678

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