PM6685TR View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
PM6685TR
STMicroelectronics
'PM6685TR' PDF : 52 Pages View PDF
Monitoring and protections
PM6685
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.
Table 13. Input capacitor manufacturer
Manufacturer
Series
TAYIO YUDEN
TAYIO YUDEN
TDK
UMK325BJ106KM-T10
GMK325BJ106MN
C3225X5R1E106M
Capacitor value
(µF)
10
10
10
Rated voltage (V)
50
35
25
8.10
Power MOSFETs
Logic-level MOSFETs are recommended, since low side and high side gate drivers are
powered by LDO5. Their breakdown voltage VBRDSS must be higher than VINmax.
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
PDHighSide = Pconduction + Pswitching
Maximum conduction losses are approximately:
Equation 17
Pconduction
= RDSon ×
VOUT
VINmin
× ILOAD (max)2
36/52
where RDSon is the drain-source on resistance of the high side MOSFET.
Switching losses are approximately:
Equation 18
Pswitching
=
VIN × (ILOAD (max) −
2
∆IL
2
)
×
t on
×
fsw
+
VIN × (ILOAD (max) +
2
∆IL
2
)
×
t
off
× fsw
where ton and toff are the switching times of the turn off and turn off phases of the MOSFET.
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