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Axelite Confidential Materials, do not copy or distribute without written consent.

Rev.1.9 Oct.30, 2019

AX3513



APPLICATION INFORMATION

Setting the Output Voltage

Application circuit item shows the basic application circuit with AX3513 adjustable

output version. The external resistor sets the output voltage according to the following

equation:











 





2

1

1

6

.

0

R

R

V

V

OUT

Table 1 Resistor select for output voltage setting

VOUT

R2

R1

1.2V

300K

300K

1.5V

300K

450K

1.8V

300K

600K

2.5V

150K

470K

3.3V

120K

540K

Inductor Selection

For most designs, the AX3513 operates with inductors of 2.2µH to 3.3µH. Low

inductance values are physically smaller but require faster switching, which results in some

efficiency loss. The inductor value can be derived from the following equation:





f

I

V

V

V

V

L

OSC

L

IN

OUT

IN

OUT













Where is inductor Ripple Current. Large value inductors lower ripple current and small

value inductors result in high ripple currents. Choose inductor ripple current approximately

20% of the maximum load current 1000mA, ΔIL=200mA.

Table 2 Inductor select for output voltage setting (VIN =3.6V)

VOUT

1.2V

1.5V

1.8V

2.5V

Inductor

2.2uH

2.2uH

2.2uH

2.2uH

Part Number

WE-TPC

7440430022

7440430022

7440430022

7440430022

Note: Part type MH or M (www.we-online.com)