ADP3419

Dual Bootstrapped, High Voltage MOSFET Driver with Output Disable ADP3419 www.datasheet4u.com FEATURES SIMPLIFIED FUNCTIONAL BLOCK DIAGRAM VCC 5 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 BST 10 IN 1 SD 2 UVLO, OVERLAP PROTECTION, SHUTDOWN AND CROWBAR CIRCUITS 9 DRVH SW 8 DRVLSD 3 CROWBAR 4 APPLICATIONS Mobile computing CPU core power converters Multiphase desk-note CPU supplies Single-supply synchronous buck converters Nonsynchronous-to-synchronous drive conversion 6 DRVL 04620-0-001 ADP3419 7 GND 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 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 disa...