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PM6685 Datasheet(PDF) 36 Page - STMicroelectronics

Part # PM6685
Description  Dual step-down main supply controller with auxilary voltages for notebook system power
PDF  52 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

PM6685 Datasheet(HTML) 36 Page - STMicroelectronics

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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
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
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
10
50
TAYIO YUDEN
GMK325BJ106MN
10
35
TDK
C3225X5R1E106M
10
25
switching
conduction
DHighSide
P
P
P
+
=
2
LOAD
min
IN
OUT
DSon
conduction
(max)
I
V
V
R
P
×
×
=
2
f
t
)
2
I
(max)
I
(
V
2
f
t
)
2
I
(max)
I
(
V
P
sw
off
L
LOAD
IN
sw
on
L
LOAD
IN
switching
×
×
∆
+
×
+
×
×
∆
−
×
=



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