Dual Bootstrapped, High Voltage MOSFET
Driver with Output Disable

ADP3419


Rev. A
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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
Undervoltage lockout

APPLICATIONS
Mobile computing CPU core power converters
Multiphase desk-note CPU supplies
Single-supply synchronous buck converters
Nonsynchronous-to-synchronous drive conversion

GENERAL DESCRIPTION
The ADP3419 is a dual MOSFET driver optimized for driving
two N-channel switching MOSFETs in nonisolated synchro-
nous 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.
The ADP3419 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 ADP3419 is specified over the extended commercial
temperature range of 0°C to 100°C and is available in a 10-lead
MSOP package.
SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM
IN
CROWBAR
UVLO,
OVERLAP
PROTECTION,
SHUTDOWN
AND
CROWBAR
CIRCUITS
BSTVCC
SW
DRVH
DRVL
GND
ADP3419
105
1
4
DRVLSD 3
SD 2
7
6
8
9
04620-0-001

Figure 1.

GENERAL APPLICATION CIRCUIT
VCC
BST
DRVH
SW
SD
IN
DRVLSD
CROWBAR
GND
DRVL
ADP3419
VDC
V
OUT
5V
FROM SYSTEM
ENABLE CONTROL
FROM CONTROLLER
PWM OUTPUT
FROM
CONTROLLER
FROM CONTROLLER
CLAMP OUTPUT
10
5
1
4
3
2
6
8
9
7
04620-0-002
Figure 2.