PM6685 datasheet(36/52 Pages) STMICROELECTRONICS

36 / 52 page

Monitoring and protections

PM6685

36/52

Tantalum capacitors are good in term of low ESR and small size, but they occasionally can

burn out if subjected to very high current during the charge. Ceramic capacitors have

usually a higher RMS current rating with smaller size and they remain the best choice.

Below there is a list of some ceramic capacitor manufacturers.

8.10

Power MOSFETs

Logic-level MOSFETs are recommended, since low side and high side gate drivers are

In notebook applications, power management efficiency is a high level requirement. The

power dissipation on the power switches becomes an important factor in switching

selections. Losses of high-side and low-side MOSFETs depend on their working conditions.

The power dissipation of the high-side MOSFET is given by:

Equation 16

Maximum conduction losses are approximately:

Equation 17

where RDSon is the drain-source on resistance of the high side MOSFET.

Switching losses are approximately:

Equation 18

where ton and toff are the switching times of the turn off and turn off phases of the MOSFET.

Table 13.

Input capacitor manufacturer

Manufacturer

Series

Capacitor value

(

µF)

Rated voltage (V)

TAYIO YUDEN

UMK325BJ106KM-T10

TAYIO YUDEN

GMK325BJ106MN

TDK

C3225X5R1E106M

switching

conduction

DHighSide

LOAD

min

OUT

DSon

conduction

(max)

)

(max)

(

)

(max)

(

off

LOAD

switching

∆

−

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