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MCP14700T Datenblatt(PDF) 11 Page - Microchip Technology

Teilenummer MCP14700T
Bauteilbeschribung  Dual Input Synchronous MOSFET Driver
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Hersteller  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP14700T Datenblatt(HTML) 11 Page - Microchip Technology

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© 2009 Microchip Technology Inc.
DS22201A-page 11
MCP14700
4.0
DETAILED DESCRIPTION
4.1
Device Overview
The MCP14700 is a synchronous MOSFET driver with
dual independent PWM inputs capable of controlling
both a ground referenced and floating N-Channel
MOSFET. The PWM input threshold levels are truly
3.0V logic tolerant and have 400 mV of typical
hystereses making the MCP14700 ideal for use with
low voltage controllers.
The MCP14700 is capable of suppling 2A (typical)
peak current to the floating high-side MOSFET that is
connected to the HIGHDR. With the exception of a
capacitor, all of the circuitry needed to drive this
high-side N-channel MOSFET is internal to the
MCP14700. A blocking device is placed between the
VCC and BOOT pins that allows the bootstrap capacitor
to be charged to VCC when the low-side power
MOSFET is conducting. Refer to the application
section, Section 5.1 “Bootstrap Capacitor Select”,
for information on determining the proper size of the
bootstrap capacitor. The HIGHDR is also capable of
sinking 2A (typical) peak current.
The LOWDR is capable of sourcing 2A (typical) peak
current and sinking 3.5A (typical) peak current. This
helps ensure that the low-side MOSFET stays turned
off during the high dv/dt of the PHASE node.
4.2
PWM Inputs
A
logic
high
on
either
PWM
pin
causes
the
corresponding output drive signal to be high. See
Figure 4-1
and
Figure 4-2
for
a
graphical
representation of the MCP14700 operation. Internally
the PWM pins are pulled to ground to ensure there is
no drive signal to the external MOSFETs if the pins are
left floating. For reliable operation, it is recommended
that the rising and falling slew rate of the PWM signal
be faster than 1V/50 ns.
When designing with the MCP14700 in applications
where cross conduction of the external MOSFETs is
not desired, care must be taken to ensure the PWM
inputs have the proper timing. There is no internal
cross conduction protection in the MCP14700.
4.3
Under Voltage Lockout (UVLO)
The UVLO feature of the MCP14700 does not allow the
HIGHDR or LOWDR output to function when the input
voltage, VCC, is below the UVLO threshold regardless
of the state of the PWMHI and PWMLO pins.
Once VCC reaches the UVLO threshold, the HIGHDR
and LOWDR outputs will respond to the state of the
PWMHI or PWMLO pins. There is a 500 mV hystereses
on the UVLO threshold.
4.4
Overtemperature Protection
The MCP14700 is protected from an overtemperature
condition by an internal thermal shutdown feature.
When the internal temperature of the MCP14700
reaches 147°C typically, the HIGHDR and LOWDR
outputs will transition to a low state regardless of the
state of the PWMHI or PWMLO pins. Once the internal
temperature
is
reduced
by
20°C
typically,
the
MCP14700 will automatically respond to the states of
the PWMHI and PWMLO pins.
4.5
Timing Diagram
The PWM signal applied to the MCP14700 is supplied
by a controller IC. The timing diagram in Figure 4-1
graphically depicts the PWM signal and the output
signals of the MCP14700.
FIGURE 4-1:
MCP14700 LOWDR Timing Diagram.
PWMLO
LOWDR
tPDHL
tRL
tPDLL
tFL


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