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ADP3611
Dual Bootstrapped, High
Voltage MOSFET Driver
with Output Disable
The ADP3611 is a dual MOSFET driver optimized for driving two
N ? channel switching MOSFETs in nonisolated synchronous buck
power converters used to power CPUs in portable computers. The
driver impedances have been chosen to provide optimum
performance in multiphase regulators at up to 25 A per phase. The
high ? side driver can be bootstrapped relative to the switch node of
the buck converter and is designed to accommodate the high voltage
slew rate associated with floating high ? side gate drivers. An internal
synchronous MOSFET is used to replace an external bootstrap
Schottky diode. This allows a larger high side gate voltage for
increased efficiency.
The ADP3611 includes an anticross ? conduction protection circuit,
undervoltage lockout to hold the switches off until the driver has
sufficient voltage for proper operation, a crowbar input that turns on
the low ? side MOSFET independently of the input signal state, and a
low ? side MOSFET disable pin to provide higher efficiency at light
loads. The SD pin shuts off both the high ? side and the low ? side
MOSFETs to prevent rapid output capacitor discharge during system
shutdown.
The ADP3611 is specified over the extended commercial
temperature range of ? 10 ° C to 100 ° C and is available in a 10 ? lead
MSOP package and 8 ? lead DFN 2x2 mm package.
Features
? All ? in ? one Synchronous Buck Driver
? One PWM Signal Generates Both Drives
? Anticross ? conduction Protection Circuitry
? Output Disable Function
? Crowbar Control
? Synchronous Override Control
? This is a Pb ? Free Device
Applications
http://onsemi.com
1
DFN8
CP SUFFIX
CASE 506AA
MSOP10
JRM SUFFIX
CASE 846AC
MARKING DIAGRAMS
1
XX M G
G
XXM G
G
X = Specific Device Code
M = Date Code
G = Pb ? Free Package
(Note: Microdot may be in either location)
?
?
?
?
Mobile Computing CPU Core Power Converters
Multiphase Desk ? note CPU Supplies
Single ? supply Synchronous Buck Converters
Nonsynchronous ? to ? Synchronous Drive Conversion
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 2 of this data sheet.
? Semiconductor Components Industries, LLC, 2008
October, 2008 ? Rev. 0
1
Publication Order Number:
ADP3611/D
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