ADP3307(Rev0) Ver la hoja de datos (PDF) - Analog Devices

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ADP3307
(Rev.:Rev0)

High Accuracy anyCAP™ 100 mA Low Dropout Linear Regulator

Analog Devices 

ADP3307

Constant Dropout Post Regulator

The circuit in Figure 24 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.

VIN = 2.5V TO 3.5V

C1

100␮F

10V

L1

6.8␮H

D1

1N5817

ADP3307-3.3

IN

OUT

R1

120⍀

ILIM

VIN

SW1

ADP3000-ADJ

FB

GND SW2

C2

100␮F

10V

SD

R2

30.1k⍀

1%

Q1

2N3906

GND

R3

124k⍀

1%

3.3V@100mA

+ C3

2.2␮F

Q2

2N3906

R4

274k⍀

Figure 24. Constant Dropout Post Regulator

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

6-Lead Plastic Surface Mount

(RT-6)

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. 0

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