MCP1401T-E/MC Microchip Technology, MCP1401T-E/MC Datasheet - Page 11

• Manufacturer Part Number: MCP1401T-E/MC
• Description: 0.5A Sngl MOSFET Drvr 8 DFN 2X3mm T/R
• Manufacturer: Microchip Technology

Specifications of MCP1401T-E/MC

• Configuration: Low-Side
• Input Type: Inverting
• Delay Time: 35ns
• Current - Peak: 500mA
• Number Of Configurations: 1
• Number Of Outputs: 1
• Voltage - Supply: 4.5 V ~ 18 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-DFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• High Side Voltage - Max (bootstrap): -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: MCP1401T-E/MCTR

4.5
The total internal power dissipation in a MOSFET driver
is the summation of three separate power dissipation
elements.
EQUATION 4-1:
4.5.1
The power dissipation caused by a capacitive load is a
direct function of frequency, total capacitive load, and
supply voltage. The power lost in the MOSFET driver
for a complete charging and discharging cycle of a
MOSFET is shown in
EQUATION 4-2:
© 2007 Microchip Technology Inc.
Where:
Where:
P
V
P
C
P
CC
DD
P
Q
T
T
L
f
Power Dissipation
CAPACITIVE LOAD DISSIPATION
P
=
=
=
=
=
=
=
P
T
L
=
=
Total power dissipation
Load power dissipation
Quiescent power dissipation
Operating power dissipation
Switching frequency
Total load capacitance
MOSFET driver supply voltage
P
Equation
f C
L
×
+
P
T
Q
×
4-2.
+
V
P
DD
CC
2
4.5.2
The power dissipation associated with the quiescent
current draw depends upon the state of the input pin.
The MCP1401/02 devices have a quiescent current
draw when the input is high of 0.85 mA (typical) and
0.1 mA (typical) when the input is low. The quiescent
power dissipation is shown in
EQUATION 4-3:
4.5.3
The operating power dissipation occurs each time the
MOSFET driver output transitions because for a very
short period of time both MOSFETs in the output stage
are on simultaneously. This cross-conduction current
leads to a power dissipation described in
EQUATION 4-4:
Where:
Where:
P
Q
V
V
I
CC
I
QH
DD
DD
QL
=
D
f
(
QUIESCENT POWER DISSIPATION
OPERATING POWER DISSIPATION
I
QH
P
=
=
=
=
=
=
=
CC
×
D
Quiescent current in the high
state
Duty cycle
Quiescent current in the low
state
MOSFET driver supply voltage
Cross-conduction constant
(A*sec)
Switching frequency
MOSFET driver supply voltage
=
MCP1401/02
+
CC f
I
QL
×
Equation
×
(
×
1 D
V
–
DS22052B-page 11
DD
4-3.
)
Equation
) V
×
DD
4-4.