CS5231−3

http://onsemi.com

11

PC Board Layout Artwork

The PC Board is a single layer copper design. The layout

artwork is reproduced at actual size below.

Figure 23. Top Copper Layer

Figure 24. Top Silk Screen Layer

2”

1.8”

2”

1.8”

GND

GND

AUX 3.3 V

AUX.DRV

Test Description

The startup and supply transition waveforms shown in

Figures 13 through 19 were obtained using the application

circuit board with a resistive load of 8.8

W. This provides a

DC load of 375 mA when the regulated output voltage is 3.3

V. A standard 2.0 A bench supply was used to provide power

to the application circuit. The transient response waveforms

shown in the Typical Performance Characteristics section

were obtained by switching a 6.3

W resistor across the

output.

Temperature Performance

The graph below shows thermal performance for the

CS5231−3 across the normal operating output current range.

Figure 25. Package Temperature vs. Load

Load Current (mA)

55

0

50

45

50

40

35

30

25

20

100 150 200 250 300 350 400 450 500

140

0

100

100

120

80

60

40

20

0

200

300

400

500

160

APPLICATIONS CIRCUIT BILL OF MATERIALS

Ref des

Description

Part Number

Manufacturer

Contact Information

C1, C2

33

mF, 16 V tantalum capacitors

TAJD336K016

AVX Corp

www.avxcorp.com

1−843−448−9411

Q1

p−channel FET transistor

MGSF1P02ELT1

ON Semiconductor

http://onsemi.com

U1

Linear regulator with auxiliary

CS5231−3DPS

ON Semiconductor

http://onsemi.com

T1−T6

Turret pins

40F6023

Newark Electronics

www.newark.com

1−800−463−9275