ACE722 Datasheet, PDF (4/8 Pages) ACE Technology Co., LTD. – 2A Step-down DC-DC Converter

ACE722
2A Step-down DC-DC Converter
Demo Board Bom
No. Reference Type
Specification
Note
1
C1
Capacitor
MLCC 10uF; SMD 0805
2
C2
Capacitor
MLCC 10uF; SMD 0805
3
D1
Diode SS34; 40V, 3A; SMD, Shielding
4
L1
Inductor 10uH; 3A; SMD; Shielding
5
IC1
IC
ACE722; SMD SOP-8
6
R1
Resistor
SMD 0805; 30K; 1%
7
R2
Resistor
SMD 0805; 10K; 1%
Layout consideration
 Careful PCB layout is critical to achieving low switching losses and clean, stable operation. The
switching power stage requires particular attention. If possible, mount all the power components on
one side of the board, with their ground terminals as close to one another as possible.
 Keep the high-current paths short, especially the distance between Cin and the Vin (GND) terminals.
It is essential for stable, jitter-free operation, showing as the following figure. The ESR of Cin should
be smaller enough and the capacitance of Cin should be large enough for filtering the switching
noise across power path, a 10uF ceramic capacitor is recommended.
 Keep the trace connecting to SW terminal wide enough for heat dissipation, if possible, it is better to
place some vias connected to the bottom copper for enhancement.
 Route high-speed switching nodes, for example SW terminal, away from sensitive analog trace (eg.
FB terminal).
VER1.6 4