AP6015 Diodes, Inc., AP6015 Datasheet - Page 14

• Manufacturer Part Number: AP6015
• Description: High Efficiency Step-down Low Power Dc-dc Converter
• Manufacturer: Diodes, Inc.

AP6015
High Efficiency Step-Down Low Power DC-DC Converter
Application Information
(Continued)
Inductor Selection
In order to avoid saturation of the inductor, the inductor should be rated at least for the maximum output
current plus the inductor ripple current which is calculated as:
V
−
O
1
(
)
Δ
V
I
Δ
=
×
=
+
CC
L
I
V
I
I
×
L
O
L
(
MAX
)
O
(
MAX
)
L
f
2
Where:
f= Switching frequency (1MHz typical)
L = Inductor value
△I
= Peak-to-peak inductor ripple current
L
I
(max) = Maximum inductor current
L
Vcc=3.6V Vout=2.5V f=1MHz L=3.3uH
Vcc=3.6V Vout=2.5V f=1MHz L=1.8uH
△I
≒230mA
△I
≒360mA
L
L
AP6015 Rev. 3
14 of 18
FEBRUARY 2009
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