FEATURES
• 4.5- to 5.5-V Operation
• Undervoltage Lockout
• 250-kHz to 1-MHz Switching Frequency
• Shutdown Quiescent Current <5 μA
• 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
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.
The Si9912 is available in both standard and lead (Pb)-free, 8-pin
SOIC packages for operation over the industrial operation range
(−40℃ to 85℃).