ADP3419 Datasheet | onsemi

FEATURES SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM 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 IN 1 SD 2 UVLO, OVERLAP PROTECTION, SHUTDOWN AND CROWBAR CIRCUITS DRVH SW DRVLSD 3 CROWBAR 4 APPLICATIONS Mobile puting CPU core power converters Multiphase desk-note CPU supplies Single-supply synchronous buck converters Nonsynchronous-to-synchronous drive conversion DRVL 04620-0-001 Figure 1. GENERAL DESCRIPTION The ADP3419 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 puters. 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 acmodate 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 mercial temperature range of 0°C to 100°C and is available in a 10-lead MSOP package. GENERAL APPLICATION CIRCUIT 5V VDC FROM CONTROLLER PWM OUTPUT FROM SYSTEM ENABLE CONTROL FROM CONTROLLER FROM CONTROLLER CLAMP OUTPUT 1 IN 2 SD BST 10 VOUT DRVH 9 SW 8 DRVL 6 3 DRVLSD CROWBAR GND Figure 2. ©2008 SCILLC. All rights reserved. January 2008 -...