ADP3300ART-2.7_00 データシートの表示（PDF） - Analog Devices

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ADP3300ART-2.7_00

High Accuracy anyCAP 50 mA Low Dropout Linear Regulator

Analog Devices 

ADP3300

Constant Dropout Post Regulator

The circuit in Figure 24 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 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

120Ω

ILIM

VIN

SW1

ADP3000-ADJ

GND SW2 FB

D1

1N5817

C2

100µF

10V

ADP3300-5

IN

OUT

R2

30.1kΩ

1%

GND

Q1

2N3906

R3

124kΩ

1%

5V @ 50mA

C3

2.2 F

Q2

2N3906

R4

274kΩ

Figure 24. Constant Dropout Post Regulator

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

6-Lead Surface Mount Package

(SOT-23)

0.122 (3.10)

0.106 (2.70)

0.071 (1.80)

6

5

4

0.118 (3.00)

0.059 (1.50)

0.098 (2.50)

1

2

3

PIN 1

0.037 (0.95) BSC

0.075 (1.90)

BSC

0.051 (1.30)

0.035 (0.90)

0.057 (1.45)

0.035 (0.90)

0.059 (0.15)

0.000 (0.00)

10°

0.020 (0.50) SEATING 0.009 (0.23) 0°

0.010 (0.25) PLANE 0.003 (0.08)

0.022 (0.55)

0.014 (0.35)

–8–

REV. A

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