AP6503 Datasheet, PDF (10/13 Pages) Diodes Incorporated – 340kHz 23V 3A SYNCHRONOUS DC/DC BUCK CONVERTER

AP6503
340kHz 23V 3A SYNCHRONOUS DC/DC BUCK CONVERTER
Applications Information (cont.)
PC Board Layout
This is a high switching frequency converter. Hence
attention must be paid to the switching currents
interference in the layout. Switching current from one
power device to another can generate voltage transients
across the impedances of the interconnecting bond wires
and circuit traces. These interconnecting impedances
should be minimized by using wide, short printed circuit
traces.
External feedback
resistor dividers
must be placed
close to the FB pin.
34mm
Input capacitor C1
must be placed as
close as possible
to the IC and to L1.
52mm
AP6503 is exposed at the bottom of the package
and must be soldered directly to a well designed
thermal pad on the PCB. This will help to increase
the power dissipation.
External Bootstrap Diode
It is recommended that an external bootstrap diode be
added when the input voltage is no greater than 5V or the
5V rail is available in the system. This helps to improve the
efficiency of the regulator. This solution is also applicable
for D > 65%. The bootstrap diode can be a low cost one
such as BAT54 or a schottky that has a low Vf.
BST ⁴
AP6503
5V
BOOST
DIODE
10nF
SW ³
Figure 7—External Bootstrap
Compensation Components
Recommended Diodes:
Part Number
B130
SK13
Voltage/Current
Rating
30V, 1A
30V, 1A
Vendor
Diodes Inc
Diodes Inc
AP6503
Document number: DS35077 Rev. 1 - 2
10 of 13
www.diodes.com
September 2011
© Diodes Incorporated