MB3882 Fujitsu Media Devices, MB3882 Datasheet - Page 22

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MB3882

Manufacturer Part Number
MB3882
Description
2-channel DC/DC Converter IC with Synchronous Rectifier
Manufacturer
Fujitsu Media Devices
Datasheet

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22
MB3882
PRECAUTIONS RELATED TO INTERNAL IC POWER CONSUMPTION
The internal power dissipation in the IC is greatly affected by the oscillator frequency and the FET total gate
charge. When using the MB 3882 in an application, caution must be taken in relation to internal IC power
consumption.
As shown below, I
gate capacitance (C
Per individual channel :
Because IC current consumption other than I
formula.
Power consumption : Pc
Pc (W)
I
B
(A)
: = Ibias
I
0.011
1
I
2
1
B
V
(average current) can be determined from the total gate charge Qg
CC
iss1
T1
T
, C
2
iss2
, C
V
Qg
CC
T
rss1
1
, C
I
B
Ibias
rss2
V
) of the external FET Q1, Q2, by the following formula.
B
2
B
is 11 mA, power consumption can be determined from the following
I
T2
B
T
Qg
T
2
(Ibias
1
Ibias
2
: = 2 mA)
1
, Qg
2
, charged from the

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