AP3429
EVB User Guide
This application note contains new product information. Diodes, Inc. reserves the right to modify the product specification without
notice.
No liability isassumed as a result of the use of this product. No rights under any patent accompany the sale of the product.
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September 2018
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7. External Components Selection
Input & output Capacitors (C
in
)
(1) For lower output ripple, low ESR is required.
(2) Low leakage current needed, X5R/X7R ceramic recommend, multiple capacitor parallel
connection.
Output Voltage programmer resistors (R
1
, R
2/4
)
(1) For programmer output voltage
(2) For accurate output voltage, 1% tolerance is required.
Inductor (L1)
(1) Low DCR for good efficiency
(2) Inductance saturate current must higher than the output current
8. Evaluation board BOM list for AP3429/3429A:
Item
Value
Type
Rating
Description
Description
CIN
22uF
X5R/X7R,
Ceramic/0805
10V
Input coupling CAP
TAIYO YUDEN
EMK212ABJ106KD-T
COUT
22uF
×
2
X5R/X7R,
Ceramic/0805
10V
Output coupling
CAP
TAIYO YUDEN
EMK212ABJ106KD-T
L1
2.2uH
>3A
Inductor
CDMC6D28NP-2R2M
R1
300K
0805
1%
Voltage set RES*
R2
150K
0805
1%
R4
Floating
Parallel Res of R2
CF
22pF
0805
Feedforward CAP
IC
AP3429/3429A
SOT23-5
*
Note: The present value of R1/R2 are based on Vout=1.8V