ADP3300ARTZ-3.2-RL 查看數據表（PDF） - Analog Devices

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ADP3300ARTZ-3.2-RL

High Accuracy anyCAP® 50 mA Low Dropout Linear Regulator

Analog Devices 

ADP3300

Constant Dropout Post Regulator

The circuit in Figure 6 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 15 mW. The ADP3000 used in this circuit is a switching

regulator in the step-up configuration.

VIN = 2.5V TO 3.5V

C1

100␮F

10V

L1

6.8␮H

R1

120⍀

ILIM

VIN

SW1

ADP3000-ADJ

GND SW2 FB

D1

1N5817

C2

100␮F

10V

ADP3300-5

IN

OUT

SD

R2

30.1k⍀

1%

GND

Q1

2N3906

R3

124k⍀

1%

5V @ 50mA

C3

2.2␮F

Q2

2N3906

R4

274k⍀

Figure 6. Constant Dropout Post Regulator

–8–

REV. C

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