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Rev.1.1 Nov.05, 2019

AX3984



AX3984 EVB Schematic

Application: Typical Application Circuit

VIN

BST

VSW

FB

COMP

GND

EN

L1

10uH

R2

10K

C1

22uF

C8

R3

C10

10nF/50V

Input

C6

22uF/25V

MLCC

R1

AX3984

C7

SS

C9

10nF

C12

Option

C5

0.1uF/25V

MLCC

Output

C2

22uF

R4

100K

EVB BOM List

Qty

Ref

Description

Package

3

C1, C2

Ceramic Capacitor X5R 16V

Murata-part number:GRM32ER61C226KE20L

1206

1

C6

Ceramic Capacitor X5R 25V

Murata-part number:GRM32ER61E226ME15L

1206

1

C5

Ceramic Capacitor

0603

1

L1

Inductor, Rated Current 3.5A

WE-part number: 744 066 100---10uH

SMD

4

R1, R2, R3, R4

Resistor, ±1%

0603

4

C8, C9, C10, C11

Ceramic Capacitor

0603

1

C7

C7 value is adjustable for the ESR of Cout

0603

1

U1(AX3984)

Step-Down DC/DC Converter

SOP8

VOUT (V)

R1(KΩ)

R3(KΩ)

C8(nF)

C7(pF)

C12(pF)

L (μH)

COUT (μF)

12

120

60.4

3.3

18

NC

10

22 x 2 (X5R 16V)

5

44.2

30.9

3.3

33

NC

10

22 x 2 (X5R 16V)

3.3

26.1

21

3.3

47

NC

10

22 x 2 (X5R 16V)

2.5

17.4

16

3.3

68

NC

10

22 x 2 (X5R 16V)

1.8

9.53

4.7

8.2

100

NC

10

22 x 2 (X5R 16V)

1.2

3

3.9

8.2

150

NC

10

22 x 2 (X5R 16V)

1

0.82

3

8.2

180

NC

10

22 x 2 (X5R 16V)