MIC4224YMME datasheet(11/20 Pages) MIC

Part #	MIC4224YMME

Description	Dual 4A, 4.5V to 18V, 15ns Switch Time, Low-Side MOSFET Drivers with Enable

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Manufacturer	MIC [MIC GROUP RECTIFIERS]

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Micrel, Inc.

MIC4223/MIC4224/MIC4225

June 2009

11

M9999-061109-A

(408) 944-0800

Quiescent Current Power Dissipation

Quiescent current powers the internal logic, level shifting

circuitry and bias for the output drivers. This current is

proportional to operating frequency and VDD 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:

DD

quiescent

I

V

Pdiss

×

=

Total Power Dissipation and Thermal Considerations

Total

package

power

dissipation

equals

the power

dissipation of each driver caused by driving the external

MOSFETs plus the supply current.

B

A

quiescent

TOTAL

Pdriver

Pdiss

+

=

The die temperature may be calculated once the total

power dissipation is known.

JA

TOTAL

A

J

Pdiss

T

θ

×

+

=

Where:

TA is the Maximum ambient temperature

TJ is the junction temperature (°C)

PdissTOTAL 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.

Figure 5a shows the power dissipation in the driver for

different values of gate charge with VDD = 5V. Figure 5b

shows the power dissipation at VDD = 12V. Figure 5c show

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.

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

100k

1M

FREQUENCY (Hz)

10M

PDISS: GATE Charge

vs. Frequency

VDD=5V

10nC

20nC

30nC

40nC

50nC

Figure 5a. PDISS vs. QG and fS for VDD = 5V

100k

1M

FREQUENCY (Hz)

10M

PDISS: GATE Charge

vs. Frequency

1.4

1.6

1.8

2.0

1.2

1.0

0.8

0.6

0.4

0.2

0

VDD=12V

10nC

20nC

30nC

40nC

50nC

Figure 5b. PDISS vs. QG and fS for VDD = 12V

Maximum Power

Dissipation

0.0

0.5

1.0

1.5

2.0

20

40

60

80

100

120

140

Ambient Temperature (°C)

Figure 5c. Maximum PDISS vs. Ambient Temperature

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MIC4224YMME Datasheet(PDF) 11 Page - MIC GROUP RECTIFIERS

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