AP6015 Diodes, Inc., AP6015 Datasheet - Page 16

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

Application Information
A good board layout practice can significantly improve the stability of the application circuit and reduce the
system noise. The feedback path must be as short as possible. The input capacitor and bypass capacitor
must be placed close to the PVCC and the VCC pins for optimal performance. It is recommended that the
ground planes for System Ground / Power Ground / Analog Ground are isolated from each others, while they
should all be joined together at a common point. An example drawing of a circuit with good ground noise
performance is shown below.
The external inductor must be placed as close as possible to the switching node, i.e. the LX pin. The copper
traces on the pcb, where high peak switching current may flow through, should be kept ‘wide’ and ‘short’.
This results in low inductance and capacitance in the current path, hence ground shift problem is avoided and
system stability stay within bound.
AP6015 Rev. 3
Layout Considerations
10µF
C1
V
I
1µF
C3
100 Ohm
10
1
2
8
PGND
High Efficiency Step-Down Low Power DC-DC Converter
PVCC
VCC
EN
(Continued)
3
AP6015
GND
www.diodes.com
6
CC
LX
PG
C
100 pF
16 of 18
FB
Rcc
CC
9
5
4
L1
R3
680K
Power Good
R2
R1
C2
10 uF
V
©
FEBRUARY 2009
AP6015
O
Diodes Incorporated