MCP14700
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1 .
TABLE 3-1:
PIN FUNCTION TABLE
MCP14700
Symbol
Description
3x3 DFN
SOIC
1
2
3
4
5
6
7
8
9
1
2
3
4
5
6
7
8
PHASE
PWM HI
PWM LO
GND
LOWDR
V CC
BOOT
HIGHDR
EP
Switch Node
High-Side PWM Control Input Signal
Low-Side PWM Control Input Signal
Ground
Low-side Gate Drive
Supply Input Voltage
Floating Bootstrap Supply
High-Side Gate Drive
Exposed Metal Pad
3.1
Switch Node (PHASE)
3.6
Supply Input Voltage (V CC )
The PHASE pin provides a return path for the high-side
gate driver. The source of the high-side and the drain of
the low-side power MOSFETs are connected to this
pin.
The V CC pin provides bias to the MCP14700 device. A
bypass capacitor is to be placed between this pin and
the GND pin. This capacitor should be placed as close
to the MCP14700 as possible.
3.2
High-Side PWM Control Input
3.7
Floating Bootstrap Supply (BOOT)
Signal (PWM HI )
The PWM input signal to control the high-side power
MOSFET is applied to the PWM HI pin. A logic high on
the PWM HI pin causes the HIGHDR pin to also
transition high.
The BOOT pin is the floating bootstrap supply pin for
the high-side gate drive. A capacitor is connected
between this pin and the PHASE pin to provide the
necessary charge to turn on the high-side power
MOSFET.
3.3
Low-Side PWM Control Input
3.8
High-Side Gate Drive (HIGHDR)
Signal (PWM LO )
The PWM input signal to control the low-side power
MOSFET is applied to the PWM LO pin. A logic high on
The HIGHDR pin provides the gate drive signal to
control the high-side power MOSFET. The gate of the
high-side power MOSFET is connected to this pin.
the PWM LO pin causes the LOWDR pin to also
transition high.
3.9
Exposed Metal Pad (EP)
3.4
Ground (GND)
The exposed metal pad of the DFN package is not
internally connected to any potential. Therefore, this
The GND pin provides ground for the MCP14700
circuitry. It should have a low-impedance connection to
the bias supply source return. High peak currents will
flow out the GND pin when the low-side power
MOSFET is being turned off.
pad can be connected to a ground plane or other
copper plane on a printed circuit board to aid in heat
removal from the package.
3.5
Low-side Gate Drive (LOWDR)
The LOWDR pin provides the gate drive signal to
control the low-side power MOSFET. The gate of the
low-side power MOSFET is connected to this pin.
? 2009 Microchip Technology Inc.
DS22201A-page 9
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