Smart Load Switches

Vishay's smart load switches offer quick output discharge and small solution size

Image of Vishay/Siliconix's Smart Load SwitchesWhen switches are used to turn loads on and off, often external circuitry is needed to achieve desired functions. The Vishay smart load switch combines all this functionality in a single IC. As the features of this IC, a simplified GPIO control can be used to implement power distribution and sequencing of multiple-sub-systems. Slew-rate control load switches provide a controlled supply ramp, reducing inrush current.

The output node has a defined decay with quick output discharge and does not leave the node floating. Fault protection and isolation load switches can have integrated protection features such as reverse-current, over-temperature, current-limiting, and short-circuit, thus increasing robustness. Integrated load switches use significantly less PCB area compared to a discrete implementation, and reduced BOM count translates to lower-manufacturing costs.       

Features
  • Low-voltage GPIO enable
  • Slew rate control
  • Quick-output discharge
  • Fault protection and isolation
  • Small-solution size
  • Power Distribution and Sequencing:
    • In many applications, there is a repetition of power rails of the same voltage. Instead of using multiple DC-DC converters to generate same voltage rails, load switches can be used to distribute the power from the DC-DC converter and sequence it in the appropriate order, reducing the board space required.
  • Slew Rate Control:
    • Core voltages should ramp up monotonically for FPGAs and other similar loads to exhibit desired behavior. A high inrush current can cause the supply voltage to dip. With a controlled slew rate at the output, load switches reduce inrush current and hence, reduce input supply voltage dip.
  • Power Saving:
    • In battery applications, not all functions are active at the same time. For instance, when a function like the GPS is not being used, the RFPA for the satellite receiver and the applications co-processor could be turned off to save power.
  • Applications
    • Smartphones and tablets
    • Digital still/video cameras
    • Portable meters and test instruments
    • Communication devices with embedded batteries
    • Portable medical and healthcare systems
    • Data storage

Smart Load Switches

ImageManufacturer Part NumberDescriptionAvailable Quantity
IC SW W/CTRL SLEW RATE 4TDFNSIP32402ADNP-T1GE4IC SW W/CTRL SLEW RATE 4TDFN39451 - ImmediateView Details
IC SW W/CTRL SLEW RATE WCSP4SIP32455DB-T2-GE1IC SW W/CTRL SLEW RATE WCSP42979 - ImmediateView Details
IC LOAD SWITCH 4TDFNSIP32408DNP-T1-GE4IC LOAD SWITCH 4TDFN61588 - ImmediateView Details
IC LOAD SWITCH 4TDFNSIP32411DNP-T1-GE4IC LOAD SWITCH 4TDFN11311 - ImmediateView Details
IC SW W/CTRL SLEW RATE WCSPSIP32462DB-T2-GE1IC SW W/CTRL SLEW RATE WCSP80 - ImmediateView Details
LOAD SWITCH 3A 28V 10DFNSIP32419DN-T1-GE4LOAD SWITCH 3A 28V 10DFN15764 - ImmediateView Details
IC SW W/CTRL SLEW RATE WCSPSIP32461DB-T2-GE1IC SW W/CTRL SLEW RATE WCSP3614 - ImmediateView Details
IC SW W/CTRL SLEW RATE 8TDFNSIP32416DNP-T1-GE4IC SW W/CTRL SLEW RATE 8TDFN5373 - ImmediateView Details
IC SW W/CTRL SLEW RATE 8TDFNSIP32414DNP-T1-GE4IC SW W/CTRL SLEW RATE 8TDFN1069 - ImmediateView Details
IC LOAD SWITCH 4TDFNSIP32409DNP-T1-GE4IC LOAD SWITCH 4TDFN6708 - ImmediateView Details
Published: 2014-11-12