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ADP3419 Datasheet(PDF) 1 Page - Analog Devices

Part No. ADP3419
Description  Dual Bootstrapped, High Voltage MOSFET Driver with Output Disable
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADP3419 Datasheet(HTML) 1 Page - Analog Devices

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Dual Bootstrapped, High Voltage MOSFET
Driver with Output Disable
ADP3419
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
© 2005 Analog Devices, Inc. All rights reserved.
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
BST
VCC
SW
DRVH
DRVL
GND
ADP3419
10
5
1
4
DRVLSD 3
SD 2
7
6
8
9
Figure 1.
GENERAL APPLICATION CIRCUIT
VCC
BST
DRVH
SW
SD
IN
DRVLSD
CROWBAR
GND
DRVL
ADP3419
VDC
VOUT
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
Figure 2.


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