SI4779CY

On Time (Max) :
Off Time (Max) :
Operating Supply Voltage :
Maximum Operating Temperature : + 85 C
Mounting Style : SMD/SMT
Number of Outputs : 1
Package / Case : SO-8
Supply Current (Max) : 0.07 mA
On Resistance (Max) : 0.045 Ohms


Features:

·  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


Application

·  Notebook Computers Power Management
·  USB Power Distribution
·  Hot Plug In Power Supplies
·  Power Supply/Load Protection
·  Battery-Charger Circuits


Specifications

Parameter		Symbol	Steady State	Unit
Voltage, IN to GND		VIN	0.3 to 7	V
Voltage, ON		VON	0.3 to 7
Continuous Drain Current (TJ = 150C)a	TA = 25RC	ID	2.4	A
	TA = 85RC		2.4
Maximum Power Dissipationa	TA = 70RC	PD	0.65	W
Operating Junction and Storage Temperature Range		Tj, Tstg	65 to 125	°C

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.