USB Power Switches

USB power switches are power management devices used to charge electronic devices on USB ports and hubs on computers, docking stations, handheld devices and automotive devices. 


How do USB power switches work?

They work by monitoring the current on a device and latch a switch off if the output current is shorted. They often have an auto reset feature which reactivates the switch once the short circuit is removed. They work in the same way as hot swap controllers, which allow circuit boards and electronic cards to be inserted into equipment, removing the need to power down during use.


Features of USB power switches

Most USB power switches have multiple safety features. For instance, built in thermal-overload protection limits junction temperature and dissipation of power. 


The internal circuity is limited to an accurate figure to protect the input supply against short circuit conditions as well as overload. They're also fitted with fault signals that notify the microprocessor whenever there's a current-limit, under voltage lockout (UVLO), short-circuit fault or thermal overload.


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Description Price Switch Type Number of Outputs Switch On Resistance Maximum Power Dissipation Mounting Type Package Type Pin Count Current Limit Dimensions Length Width Height Maximum Input Voltage Maximum Operating Temperature
RS Stock No. 761-9547
Mfr. Part No.LTC4090EDJC#PBF
HK$64.21
Each
units
- 2 215mΩ - Surface Mount DFN 22 0.525A 6 x 3 x 0.75mm 6mm 3mm 0.75mm 5.5 V +85 °C
RS Stock No. 809-9887
Mfr. Part No.ADP198ACBZ-R7
HK$8.536
Each (On a Tape of 5)
units
High Side 1 90mΩ - Surface Mount WLCSP 4 - 0.99 x 1.065 x 0.37mm 0.99mm 1.065mm 0.37mm 6.5 V +85 °C
RS Stock No. 154-7658
Mfr. Part No.LTC4090EDJC#PBF
HK$41.758
Each (In a Tube of 61)
units
- 2 215mΩ - Surface Mount DFN 22 0.525A 6 x 3 x 0.75mm 6mm 3mm 0.75mm 5.5 V +85 °C
RS Stock No. 160-4458
Mfr. Part No.ADP197ACBZ-R7
HK$6.506
Each (On a Reel of 3000)
units
High Side 1 17mΩ - Surface Mount WLCSP 6 - 1.5 x 1 x 0.38mm 1.5mm 1mm 0.38mm 5.5 V +85 °C
RS Stock No. 160-4460
Mfr. Part No.ADP198ACBZ-R7
HK$4.951
Each (On a Reel of 3000)
units
High Side 1 90mΩ - Surface Mount WLCSP 4 - 0.99 x 1.065 x 0.37mm 0.99mm 1.065mm 0.37mm 6.5 V +85 °C
RS Stock No. 809-9881
Mfr. Part No.ADP197ACBZ-R7
HK$11.516
Each (In a Pack of 5)
units
High Side 1 17mΩ - Surface Mount WLCSP 6 - 1.5 x 1 x 0.38mm 1.5mm 1mm 0.38mm 5.5 V +85 °C