SI4779CY Datasheet, PDF (1/8 Pages) Vishay Siliconix – High-Side N-Channel Switch with Current Limit

New Product
Si4779CY
Vishay Siliconix
High-Side N-Channel Switch with Current Limit
FEATURES
D User Set Over Current Limit From 400 mA to 2.4 A
D Low r_DS(on) 45 mW (max) at 25_C
D Fault Indicator
D Under Voltage Lockout
APPLICATIONS
D Notebook Computers Power Management
D USB Power Distribution
D Hot Plug In Power Supplies
D Power Supply/Load Protection
D Battery-Charger Circuits
DESCRIPTION
The Si4779CY n-channel high-side switch combines a low
r_DS(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 FOOTr SO-8 package.
FUNCTIONAL BLOCK DIAGRAM
IN
OUT
FAULT
ON
GND
Document Number: 71664
S-04276—Rev. A, 16-Jul-01
Control
Circuit
SET
V_R
See page 7 for a detailed block diagram.
www.vishay.com
1