AP1603-EVM

AP1603
(User Guide)
STEP-UP DC/DC CONVERTER
1
Introduction
AP1603 is a high efficiency step-up DC/DC converter for applications using as few as a single Ni-MH
or Li-Ion battery cells.
Only four external components are required to deliver a fixed output voltage of 3.3V. The AP1603 starts
up from less than 0.9V input with 1mA load. Pulse Frequency Modulation scheme brings optimized
performance for applications with light output loading and low input voltages. The output ripple and noise
are lower compared with the circuits operating in PSM mode.
The PFM control circuit operating in 150kHz (max.) switching rate results in smaller passive components.
The space saving SOT26 packages make the AP1603 an ideal choice of DC/DC converter for space
conscious applications, like pagers, electronic cameras, and wireless microphones.
2
EVM Schematic (VIN=1.1 to 3.6V;VOUT=3.3V)
AP34063 Rev. 1
1 of 2
www.diodes.com
May 2009
© Diodes Incorporated
AP1603
(User Guide)
STEP-UP DC/DC CONVERTER
3
Board Layout
Top Side
4
Bottom Side
Bill of Materials (VOUT=3.3V)
Component
QTY
Specification
Maker
Maker Part No.
Size
C1,C5
2
47uF/10V(MLCC)
TAIYO YUDEN
LMK325BJ476MM
1210
C2
-
Open
-
-
-
C3
1
0.1uF/50V(MLCC)
TAIYO YUDEN
LMK212B7104KG
0805
C4
-
Option
-
-
-
R1
-
Open
-
-
-
R2
-
Open
-
-
-
R3
-
Open
-
-
-
L1
1
22uH/0.65A
Wϋrth Electronics
-
U1
1
AP1603
DIODES Inc.
AP1603WL-7
Location
AP34063 Rev. 1
2 of 2
www.diodes.com
SOT26-3L
May 2009
© Diodes Incorporated
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