APL3233 datasheet(13/18 Pages) ANPEC

13 / 18 page

Rev. A.2 - Jul., 2017

www.anpec.com.tw

APL3233

Application Information

FAULT Output

Since the FAULT pin is an open-drain output, connecting

a resistor R

UP to a pull high voltage is necessary. It is also

recommended that connect the FAULT to the MCU GPIO

through a resistor R

FAULT. The RFAULT prevents damage to

the MCU under a failure mode. The recommended value

of the resistors should be between 10k

Ω to 100kΩ.

Capacitor Selection

The input capacitor is for decoupling and prevents the

input voltage from overshooting to dangerous levels. In

the AC adapter hot plug-in applications or load current

step-down transient, the input voltage has a transient

spike due to the parasitic inductance of the input cable. A

25V, X5R, dielectric ceramic capacitor with a value be-

tween 1

µF and 4.7µF placed close to the IN pin is

recommended.

The output capacitor is for output voltage decoupling, and

also can be as the input capacitor of the charging circuit.

At least, a 1

µF, 10V, X5R capacitor is recommended.

In some failure modes, a high voltage may be applied to

the device. Make sure the clearance constraint of the PCB

layout must satisfy the design rule for high voltage.

The exposed pad of the WLCSP0.74x1.14-5 performs

the function of channeling heat away. It is recommended

that connect the exposed pad to a large copper ground

plane on the backside of the circuit board through sev-

eral thermal vias to improve heat dissipation.

The input and output capacitors should be placed close

to the IC. R

ILIM also should be placed close to the IC.

The high current traces like input trace and output trace

must be wide and short.

Layout Consideration

Recommended Minimum Footprint

Unit: mm

WLCSP0.74x1.14-5

0.24

0.74

0.2

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