MCP14628 Microchip Technology, MCP14628 Datasheet - Page 12

• Manufacturer Part Number: MCP14628
• Description: 2A Synchronous Buck Power MOSFET Driver
• Manufacturer: Microchip Technology

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MCP14628
FIGURE 5-1:
The charge needed for the turning on of the high-side
power MOSFET comes from the bootstrap capacitor
C
HIGHDR circuitry, into the gate of the high-side power
MOSFET, out the source, and back to C
printed circuit board traces that construct this current
loop need to have a small area and low inductance. To
control the inductance, short and wide traces must be
used.
Figure 5-2
outputs of the MCP14628 are low and the power
MOSFETs are turned off. These current paths should
also have low inductance and a small loop area to
minimize voltage ringing and spiking.
FIGURE 5-2:
DS22083A-page 12
BOOT
PWM
PWM
V
C
V
C
CC
CC
VCC
VCC
. Current flows from C
depicts the current flow paths when the
MCP14628
MCP14628
Control
Logic
Control
Logic
Turn On Current Paths.
Turn Off Current Paths.
C
C
BOOT
BOOT
BOOT
through the internal
V
V
BOOT
SUPPLY
SUPPLY
. The
The following recommendations should be followed to
allow for optimal circuit performance.
- The components that construct the high
- A ground plane should be used to keep both
current paths previously mentioned should be
placed close the MCP14628. The traces
used to construct these current loops should
be wide and short to keep the inductance and
impedance low.
the parasitic inductance and impedance
minimized. The MCP14628 is capable of
sourcing and sinking high peaks current and
any extra parasitic inductance or impedance
will result in non-optimal performance.
© 2008 Microchip Technology Inc.