DESCRIPTION

The Si9912 is a dual MOSFET high-speed driver with break-before-make. It is designed to operate in high frequency dc-dc switchmode power supplies. The high-side driver is bootstrapped to handle the high voltage slew rate associated with “floating” high-side gate drivers. Each driver is capable of switching a 3000-pF load with 60-ns propogation delay and 25-ns transition time. The Si9912 comes with an internal break-before-make feature to prevent shoot-through current in the external MOSFETs. A shutdown pin is used to enable the driver. When disabled, the quiescent current of the driver is less than 5
A.

FEATURES

• 4.5- to 5.5-V Operation

• Undervoltage Lockout

• 250-kHz to 1-MHz Switching Frequency

• Shutdown Quiescent Current <5
A

• One Input PWM Signal Generates Both Drive

• Bootstrapped High-Side Drive

• Operates from 4.5- to 30-V Supply

• TTL/CMOS Compatible Input Levels

• 1-A Peak Drive Current

• Break-Before-Make Circuit

APPLICATIONS

• Multiphase Desktop CPU Supplies

• Single-Supply Synchronous Buck Converters

• Mobile Computing CPU Core Power Converters

• Standard-Synchronous Converters

• High Frequency Switching Converters