MIC4420YM Micrel Inc, MIC4420YM Datasheet - Page 9

• Manufacturer Part Number: MIC4420YM
• Description: IC DRIVER MOSFET 6A LS 8-SOIC
• Manufacturer: Micrel Inc

Specifications of MIC4420YM

• Configuration: Low-Side
• Input Type: Non-Inverting
• Delay Time: 18ns
• Current - Peak: 6A
• 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)
• Device Type: Low Side
• Module Configuration: Low Side
• Peak Output Current: 6A
• Output Resistance: 1.7ohm
• Input Delay: 18ns
• Output Delay: 48ns
• Supply Voltage Range: 4.5V To 18V
• Driver Case Style: SOIC
• Number Of Drivers: 1
• Driver Configuration: Non-Inverting
• Driver Type: Low Side
• Input Logic Level: CMOS/TTL
• Rise Time: 35ns
• Fall Time: 35ns
• Propagation Delay Time: 75ns
• Operating Supply Voltage (max): 18V
• Power Dissipation: 1.04W
• Operating Supply Voltage (min): 4.5V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• High Side Voltage - Max (bootstrap): -
• Lead Free Status / Rohs Status: Compliant
• Other names: 576-3376-5; MIC4420YM

MIC4420/4429
Capacitive Load Power Dissipation
Dissipation caused by a capacitive load is simply the en-
ergy placed in, or removed from, the load capacitance by
the driver. The energy stored in a capacitor is described
by the equation:
As this energy is lost in the driver each time the load is
charged or discharged, for power dissipation calculations
the 1/2 is removed. This equation also shows that it is
good practice not to place more voltage on the capacitor
than is necessary, as dissipation increases as the square
of the voltage applied to the capacitor. For a driver with a
capacitive load:
where:
f = Operating Frequency
C = Load Capacitance
V
Inductive Load Power Dissipation
For inductive loads the situation is more complicated. For
the part of the cycle in which the driver is actively forcing
current into the inductor, the situation is the same as it is
in the resistive case:
However, in this instance the R
the on resistance of the driver when its output is in the high
state, or its on resistance when the driver is in the low state,
depending on how the inductor is connected, and this is
still only half the story. For the part of the cycle when the
inductor is forcing current through the driver, dissipation is
best described as
where V
driver (generally around 0.7V). The two parts of the load
dissipation must be summed in to produce P
Quiescent Power Dissipation
Quiescent power dissipation (P
section) depends on whether the input is high or low. A low
input will result in a maximum current drain (per driver) of
≤0.2mA; a logic high will result in a current drain of ≤2.0mA.
Quiescent power can therefore be found from:
July 2005
S
= Driver Supply Voltage
E = 1/2 C V
P
P
P
P
P
D
L
L1
L2
L
Q
is the forward drop of the clamp diode in the
= f C (V
= P
= V
= I
= I V
L1
2
S
R
D
[D I
+ P
O
S
(1-D)
2
)
D
H
L2
2
+ (1-D) I
Q
L
]
O
, as described in the input
required may be either
L
9
where:
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 in
the output totem-pole are ON simultaneously, and a cur-
rent is conducted through them from V
transition power dissipation is approximately:
where (A•s) is a time-current factor derived from the typical
characteristic curves.
Total power (P
Definitions
R
P
P
V
V
C
P
P
I
I
I
I
D = fraction of time input is high (duty cycle)
D = Duty Cycle expressed as the fraction of time the
I
H
H
D
D
Q
O
S
S
T
L
L
L
L
f = Operating Frequency of the driver in Hertz
= quiescent current with input high
= quiescent current with input low
= power supply voltage
= Load Capacitance in Farads.
= Power supply current drawn by a driver when both
= Power supply current drawn by a driver when both
= Output current from a driver in Amps.
= 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
= Power dissipated in a driver when the output
= Output resistance of a driver in Ohms.
= Power supply voltage to the IC in Volts.
P
P
T
D
input to the driver is high.
inputs are high and neither output is loaded.
inputs are low and neither output is loaded.
load in Watts.
Watts.
changes states (“shoot-through current”) in Watts.
NOTE: The “shoot-through” current from a dual
transition (once up, once down) for both drivers
is shown by the "Typical Characteristic Curve :
Crossover Area vs. Supply Voltage and is in am-
pere-seconds. This figure must be multiplied by
the number of repetitions per second (frequency)
to find Watts.
= 2 f V
= P
D
L
) then, as previously described is:
+ P
S
(A•s)
Q
+P
T
+
S
to ground. The
M9999-072205
Micrel, Inc.