MIC4420BM Micrel Inc, MIC4420BM Datasheet - Page 9
![IC DRIVER MOSFET 6A LOSIDE 8SOIC](/photos/6/50/65078/576-8-soic_sml.jpg)
MIC4420BM
Manufacturer Part Number
MIC4420BM
Description
IC DRIVER MOSFET 6A LOSIDE 8SOIC
Manufacturer
Micrel Inc
Datasheet
1.MIC4420YM_TR.pdf
(12 pages)
Specifications of MIC4420BM
Mounting Type
Surface Mount
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
Package / Case
8-SOIC (3.9mm Width)
Device Type
MOSFET
Driver Case Style
SOIC
No. Of Pins
8
Peak Reflow Compatible (260 C)
No
Output Current
0.25A
Supply Voltage Max
18V
Leaded Process Compatible
No
No. Of Drivers
1
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
Peak Output Current
6mA
Power Dissipation
1.04W
Output Resistance
1.7Ohm
Operating Supply Voltage (min)
4.5V
Turn Off Delay Time
100fs
Turn On Delay Time (max)
100ps
Operating Temp Range
-40C to 85C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Pin Count
8
Package Type
SOIC
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
High Side Voltage - Max (bootstrap)
-
Lead Free Status / RoHS Status
Not Compliant, Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MIC4420BM
Manufacturer:
MICREL/麦瑞
Quantity:
20 000
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.