MCP14628T-E/MF【PDF 1/24 页】IC MOSFET DVR 2A SYNC BUCK 8-DFN

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MCP14628

2A Synchronous Buck Power MOSFET Driver

Features

? Dual Output MOSFET Driver for Synchronous

Applications

? 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:

- 3300 pF in 10 ns (typical)

? Tri-State PWM Pin for Power Stage Shutdown

? Input Voltage Undervoltage Lockout Protection

? Space Saving Packages:

- 8-Lead SOIC

- 8-Lead 3x3 DFN

Applications

? High Efficient Synchronous DC/DC Buck

Converters

? High Current Low Output Voltage Synchronous

DC/DC Buck Converters

? High Input Voltage Synchronous DC/DC Buck

Converters

? Core Voltage Supplies for Microprocessors

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.

Package Types

8-Lead SOIC

8-Lead DFN

HIGHDR

BOOT

PWM

GND

PHASE

FCCM

V CC

LOWDR

HIGHDR

BOOT

PWM

GND

PHASE

FCCM

V CC

LOWDR

Note 1: Exposed pad on the DFN is electrically isolated.

? 2008 Microchip Technology Inc.

DS22083A-page 1

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