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ADP3118
Dual Bootstrapped 12 V MOSFET Driver
Dual Bootstrapped 12 V
MOSFET Driver with Output Disable
FEATURES
Optimized for low gate charge MOSFETs
All-in-one synchronous buck driver
Bootstrapped high-side drive
One PWM signal generates both drives
Anticross-conduction protection circuitry
Output disable control turns off both MOSFETs to float
output per Intel VRM 10
Meets CPU VR requirement when used with
Analog Devices, Inc. Flex-Mode1 controller
APPLICATIONS
Multiphase desktop CPU supplies
Single-supply synchronous buck converters
GENERAL DESCRIPTION The ADP3118 is a dual, high voltage MOSFET driver optimized
for driving two N-channel MOSFETs, which are the two switches
in a nonisolated synchronous buck power converter. Each of the
drivers is capable of driving a 3000 pF load with a 25 ns prop-
agation delay and a 25 ns transition time. One of the drivers can
be bootstrapped and is designed to handle the high voltage slew
rate associated with floating high-side gate drivers. The ADP3118
includes overlapping drive protection to prevent shoot-through
current in the external MOSFETs.
The OD pin shuts off both the high-side and the low-side
MOSFETs to prevent rapid output capacitor discharge during
system shutdown.
The ADP3118 is specified over the commercial temperature
range of 0°C to 85°C and is available in 8-lead SOIC and 8-lead
LFCSP packages.
SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM OD
VCC
BST
DRVH
DRVL
PGND
RBST
CBST1
CBST2
VIN12VINDUCTOR05452-001
Figure 1.
