MCP14628 Microchip Technology, MCP14628 Datasheet
MCP14628
Manufacturer Part Number
MCP14628
Description
2A Synchronous Buck Power MOSFET Driver
Manufacturer
Microchip Technology
Datasheet
1.MCP14628.pdf
(24 pages)
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Features
• Dual Output MOSFET Driver for Synchronous
• High Peak Output Current: 2A (typical)
• Adaptive Cross Conduction Protection
• Internal Bootstrap Blocking Device
• +36V BOOT Pin Maximum Rating
• Enhanced Light Load Efficiency Mode
• Low Supply Current: 80 µA (typical)
• High Capacitive Load Drive Capability:
• Tri-State PWM Pin for Power Stage Shutdown
• Input Voltage Undervoltage Lockout Protection
• Space Saving Packages:
Applications
• High Efficient Synchronous DC/DC Buck
• High Current Low Output Voltage Synchronous
• High Input Voltage Synchronous DC/DC Buck
• Core Voltage Supplies for Microprocessors
Package Types
© 2008 Microchip Technology Inc.
Applications
- 3300 pF in 10 ns (typical)
- 8-Lead SOIC
- 8-Lead 3x3 DFN
Converters
DC/DC Buck Converters
Converters
Note 1: Exposed pad on the DFN is electrically isolated.
HIGHDR
BOOT
PWM
GND
2A Synchronous Buck Power MOSFET Driver
1
2
3
4
8-Lead SOIC
8
7
6
5
PHASE
LOWDR
FCCM
V
CC
General Description
The MCP14628 is a dual MOSFET gate driver
designed to optimally drive two N-Channel MOSFETs
arranged in a non-isolated synchronous buck converter
topology. With the capability to source 2A peaks
typically from both the high-side and low-side drives,
the MCP14628 is an ideal companion to buck control-
lers that lack integrated gate drivers. Additionally,
greater design flexibility is offered by allowing the gate
drivers to be placed close to the power MOSFETs.
The MCP14628 features the capability to sink 3.5A
peak typically for the low-side gate drive. This allows
the MCP14628 the capability of holding off the low-side
power MOSFET during the rising edge of the PHASE
node. Internal adaptive cross conduction protection
circuitry is also used to mitigate both external power
MOSFETs from simultaneously conducting.
The low resistance pull-up and pull-down drives allow
the MCP14628 to quickly transition a 3300 pF load in
typically 10 ns and with a propagation time of typically
20 ns. Bootstrapping for the high-side drive is internally
implemented which allows for a reduced system cost
and design complexity.
The PWM input to the MCP14628 can be tri-stated to
force both drive outputs low for true power stage
shutdown. Light load system efficiency is improved by
using the diode emulation feature of the MCP14628.
When the FCCM pin is grounded, diode emulation
mode is entered. In this mode, discontinuous conduc-
tion is allowed by sensing when the inductor current
reach zero and turning off the low-side power
MOSFET.
HIGHDR
BOOT
PWM
GND
MCP14628
1
2
3
4
8-Lead DFN
8
7
6
5
PHASE
LOWDR
FCCM
V
DS22083A-page 1
CC
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