AP6503

Document number: DS35077 Rev. 7 - 2

13 of 16

www.diodes.com

May 2017

© Diodes Incorporated

AP6503

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.

The 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

AP6503

BST

SW

10nF

BOOST

DIODE

5V

4

3

Figure 7

– External Bootstrap

Compensation Components

Recommended Diodes:

Part Number

Voltage/Current

Rating

Vendor

B130

30V, 1A

Diodes Inc.

SK13

30V, 1A

Diodes Inc.

Input capacitor C1

must be placed as

close as possible

to the IC and to L1.

34mm

52mm

External feedback

resistor dividers

must be placed

close to the FB pin.