Vishay Si9912 Data Sheet

查询SI9912供应商

Si9912 Vishay Siliconix

Half-Bridge MOSFET Driver for Switching Power Supplies

FEATURES APPLICATIONS

4.5- to 5.5-V Operation Multiphase Desktop CPU Supplies Undervoltage Lockout Single-Supply Synchronous Buck Converters 250-k Hz to 1-MHz Switching Frequency Mobile Computing CPU Core Power Converters Shutdown Quiescent Current <5
A Standard-Synchronous Converters One Input PWM Signal Generates Both Drive High Frequency Switching Converters

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

DESCRIPTION The Si9912 is a dual MOSFET high-speed driver with driver. When disabled, the quiescent current of the driver is break-before-make. It is designed to operate in high frequency less than 5
A. dc-dc switchmode power supplies. The high-side driver is bootstrapped to handle the high voltage slew rate associated

The Si9912 is available in both standard and lead (Pb)-free, 8-pin

with “floating” high-side gate drivers. Each driver is capable of

SOIC packages for operation over the industrial operation range

switching a 3000-p F load with 60-ns propogation delay and

(−40C to 85C).

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

FUNCTIONAL BLOCK DIAGRAM AND TRUTH TABLE

CBOOT TRUTH TABLE

Level Shift

VS SD IN VOUTL VOUTH

OUTPUT

Undervoltage

IN Q2

Document Number: 71311 www.vishay.com S-40134—Rev. B, 16-Feb-04