ADP3310

–8–

REV. A

OUTLINE DIMENSIONS

Dimensions shown in inches and (mm).

8-Lead Small Outline

(SO-8)

0.0098 (0.25)

0.0075 (0.19)

0.0500 (1.27)

0.0160 (0.41)

8

0

0.0196 (0.50)

0.0099 (0.25)

45

85

4

1

0.1968 (5.00)

0.1890 (4.80)

0.2440 (6.20)

0.2284 (5.80)

PIN 1

0.1574 (4.00)

0.1497 (3.80)

0.0500 (1.27)

BSC

0.0688 (1.75)

0.0532 (1.35)

SEATING

PLANE

0.0098 (0.25)

0.0040 (0.10)

0.0192 (0.49)

0.0138 (0.35)

5mAOS

High Current Post Regulator with SOIC PMOS

Post regulation for a switch-mode supply (Figure 15) can be

implemented with a PMOS in an SO-8 package to provide a

significant reduction in peak-to-peak ripple voltage. A constant

dropout voltage in conjunction with low quiescent current yield

a more efficient voltage regulator that can significantly extend

battery life. The bottom waveform of Figure 16 is the output of

the switching regulator. The top waveform is the output of the

post regulator.

In applications where cost is a higher concern than efficiency, a

resistor divider can be used to provide feedback instead of the

current mirror. Power efficiency is lower in cases of light loads.

20mV/div

10mV/div

5 s

Figure 16. Pre-and Post-Regulated Voltage