MIC4451BM Micrel Inc, MIC4451BM Datasheet - Page 11

• Manufacturer Part Number: MIC4451BM
• Description: IC DRIVER MOSF 12A LO SIDE 8SOIC
• Manufacturer: Micrel Inc

Specifications of MIC4451BM

• Configuration: Low-Side
• Input Type: Inverting
• Delay Time: 15ns
• Current - Peak: 12A
• Number Of Configurations: 1
• Number Of Outputs: 1
• Voltage - Supply: 4.5 V ~ 18 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• High Side Voltage - Max (bootstrap): -

Transition Power Dissipation
Transition power is dissipated in the driver each time its
output changes state, because during the transition, for
a very brief interval, both the N- and P-channel
MOSFETs
simultaneously, and a current is conducted through them
from V
approximately:
where (A × s) is a time-current factor derived from the
typical characteristic curve “Crossover Energy vs.
Supply Voltage.” Total power (P
described is:
Definitions
C
D = Duty Cycle expressed as the fraction of time the
input to the driver is high.
f = Operating Frequency of the driver in Hertz
I
inputs are high and neither output is loaded.
I
inputs are low and neither output is loaded.
I
P
P
load in Watts.
P
P
changes states (“shoot-through current”) in Watts.
NOTE: The “shoot-through” current from a dual
transition (once up, once down) for both drivers is
stated in Figure 7 in ampere-nanoseconds. This
figure must be multiplied by the number of
repetitions per second (frequency) to find Watts.
R
V
H
L
D
Micrel Inc.
January 2011
D
L
Q
T
S
L
O
= Power supply current drawn by a driver when both
= Output current from a driver in Amps.
= Power supply current drawn by a driver when both
= Load Capacitance in Farads.
= Power supply voltage to the IC in Volts.
= Total power dissipated in a driver in Watts.
= Power dissipated in the driver due to the driver’s
= Power dissipated in a quiescent driver in Watts.
= Output resistance of a driver in Ohms.
= Power dissipated in a driver when the output
S
P
P
to ground. The transition power dissipation is
T
D
= 2 f V
= P
in
L
+ P
S
the
(A × s)
Q
+ P
output
T
totem-pole
D
) then, as previously
are
ON
11
MIC4451/4452
M9999-011811