Si4788CY Datasheet, PDF (6/7 Pages) Vishay Siliconix – 5-A Controlled Slew Rate Load Switch with Level Shift

Si4788CY
Vishay Siliconix
New Product
TYPICAL CHARACTERISTICS (25_C UNLESS NOTED)
2
1
Duty Cycle = 0.5
Normalized Thermal Transient Impedance, Junction-to-Foot
0.2
0.1
0.1
0.05
0.02
Single Pulse
0.01
10^–4
10^–3
10^–2
10^–1
1
10
Square Wave Pulse Duration (sec)
TYPICAL APPLICATIONS
The Si4788CY can be used to control a load up to 5-Amp
where the control logic voltage is different from the voltage of
the load being controlled, and/or the load has a large
capacitive component and inrush currents must be minimized
during switching.
therefore compatible with any CMOS logic voltage between
2.2 V and 5 V under these conditions with no extra
configuration required. With a 3.3-V power rail voltage the
minimum high input voltage is 1.5 V, making it compatible with
1.8-V logic.
The low R_DS(on) of 20-mW typical makes the switch ideal for
applications such as power bus switching in notebook
computers and central office telecom equipment. For a load of
5 A, the voltage drop is only approximately 100 mV.
The control input is a CMOS compatible input with a minimum
high input voltage of 2.2 V with a power rail voltage of 5 V. It is
The Si4788CY is designed to give a steady dv/dt on the output
during turn-on even with capacitive loads. The output rise time
is 280-ms typical with a 100-mF load, which corresponds to a
dv/dt of about 20 V/ms, or a capacitive inrush current of around
2-A max with a 100-mF load. Higher values of capacitance
result in a slower switching speed, therefore even with very
high values of capacitance, inrush should not be a problem.
www.vishay.com
2-6
Document Number: 71100
S-02651—Rev. C, 27-Nov-00