SI4779CY ,High-Side N-Channel Switch with Current LimitS-04276—Rev. A, 16-Jul-01 2Si4779CYNew ProductVishay SiliconixSPECIFICATIONSTest Conditions Unless ..
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SL441C , ZERO VOLTAGE SWITCH
SL441C , ZERO VOLTAGE SWITCH
SL443A , ZERO VOLTAGE SWITCH
SL443A , ZERO VOLTAGE SWITCH
SL443A , ZERO VOLTAGE SWITCH
SI4779CY
High-Side N-Channel Switch with Current Limit
Si4779CY
Vishay SiliconixNew Product
High-Side N-Channel Switch with Current LimitFEATURES APPLICATIONS User Set Over Current Limit From 400 mA to 2.4 A Low rDS(on) 45 m� (max) at 25�C Fault Indicator Under Voltage Lockout Notebook Computers Power Management USB Power Distribution Hot Plug In Power Supplies Power Supply/Load Protection Battery-Charger Circuits
DESCRIPTION
The Si4779CY n-channel high-side switch combines a low
rDS(on) MOSFET switch with a user set, pulse gate control
(PGC) based current limit. This switch is designed to protect
the system power supply from overloads and short circuit
conditions in applications such as USB. The PGC based
approach to the current limiter provides the additional benefit
of keeping the MOSFET junction temperature within
specification, thereby eliminating the need for thermal
shutdown. The low quiescent current makes the Si4779CY
ideal for use in battery powered devices. The Si4779CY
operates on both 3-V and 5-V busses, and is packaged in the
LITTLE FOOT� SO-8 package.
FAULT
GND
OUT
SET
See page 7 for a detailed block diagram.
