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Micrel, Inc.
MIC4223/MIC4224/MIC4225
Quiescent Current Power Dissipation
Quiescent current powers the internal logic, level shifting
circuitry and bias for the output drivers. This current is
1.4
PDISS: GATE Charge
vs. Frequency
proportional to operating frequency and V DD voltage. The
typical characteristic graphs show how supply current
varies with switching frequency and supply voltage.
The power dissipated by the driver’s quiescent current is:
Pdiss quiescent = V DD × I DD
1.2
1.0
0.8
0.6
V DD =5V
50nC
40nC
30nC
20nC
Total Power Dissipation and Thermal Considerations
0.4
Total package power dissipation equals the power
0.2
10nC
dissipation of each driver caused by driving the external
MOSFETs plus the supply current.
0
100k
1M
10M
Pdiss TOTAL = Pdiss quiescent + Pdriver A + Pdriver B
The die temperature may be calculated once the total
power dissipation is known.
FREQUENCY (Hz)
Figure 5a. P DISS vs. Q G and f S for V DD = 5V
50nC
V DD =12V
T J = T A + Pdiss TOTAL × θ JA
Where:
T A is the Maximum ambient temperature
T J is the junction temperature (°C)
Pdiss TOTAL is the power dissipation of the Driver
θ JA is the thermal resistance from junction-to-
ambient air (°C/W)
The following graphs help determine the maximum gate
charge that can be driven with respect to switching
frequency, supply voltage and ambient temperature.
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
PDISS: GATE Charge
vs. Frequency
40nC
30nC
20nC
10nC
Figure 5a shows the power dissipation in the driver for
different values of gate charge with V DD = 5V. Figure 5b
shows the power dissipation at V DD = 12V. Figure 5c show
0
100k
1M
FREQUENCY (Hz)
10M
the maximum power dissipation for a given ambient
temperature for the SOIC and ePAD MSOP packages.
The maximum operating frequency of the driver may be
limited by the maximum power dissipation of the driver
package.
Figure 5b. P DISS vs. Q G and f S for V DD = 12V
Maximum Power
Dissipation
2.0
1.5
1.0
0.5
0.0
20
40
60
80
100
120
140
Ambient Temperature (°C)
Figure 5c. Maximum P DISS vs. Ambient Temperature
June 2009
11
M9999-061109-A
(408) 944-0800
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