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. 162-7918
Mfr. Part No.TPS2511DGN
HK$12.027
Each (In a Tube of 80)
units
High Side 1 120mΩ Internally Limited Surface Mount MSOP 8 3330mA 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5.5 V +85 °C
RS Stock No. 812-0408
Mfr. Part No.TPS2511DGN
HK$12.027
Each (In a Pack of 10)
units
High Side 1 120mΩ Internally Limited Surface Mount MSOP 8 3330mA 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5.5 V +85 °C
RS Stock No. 739-5144
Mfr. Part No.FSUSB42MUX
HK$5.28
Each
units
- 2 6.5Ω - Surface Mount MSOP 10 - 3 x 3 x 0.7mm 3mm 3mm 0.7mm - +85 °C
RS Stock No. 168-4137
Mfr. Part No.TPS2540RTET
HK$11.279
Each (On a Reel of 250)
units
High Side 1 120mΩ Internally Limited Surface Mount WQFN 16 2.8A 3.15 x 3.15 x 0.75mm 3.15mm 3.15mm 0.75mm 5.5 V +85 °C
RS Stock No. 864-4743
Mfr. Part No.FSUSB42MUX
HK$1.853
Each (On a Reel of 4000)
units
- 1 6.5Ω - Surface Mount MSOP 10 - 3 x 3 x 0.85mm 3mm 3mm 0.85mm - +85 °C
RS Stock No. 730-0657
Mfr. Part No.TPS2540RTET
HK$18.40
Each
units
High Side 1 120mΩ Internally Limited Surface Mount WQFN 16 2.8A 3.15 x 3.15 x 0.75mm 3.15mm 3.15mm 0.75mm 5.5 V +85 °C
RS Stock No. 165-8353
Mfr. Part No.AP2337SA-7
HK$1.051
Each (On a Reel of 3000)
units
High Side 1 170mΩ Internally Limited Surface Mount SOT-23 3 1.9A 3 x 1.4 x 1.1mm 3mm 1.4mm 1.1mm 5.5 V +85 °C
RS Stock No. 921-0470
Mfr. Part No.AP2337SA-7
HK$2.76
Each (In a Pack of 30)
units
High Side 1 170mΩ Internally Limited Surface Mount SOT-23 3 1.9A 3 x 1.4 x 1.1mm 3mm 1.4mm 1.1mm 5.5 V +85 °C
RS Stock No. 190-6478
Mfr. Part No.MAX4899AEETE+
HK$33.192
Each (In a Pack of 5)
units
High Speed - 18Ω 1.67 W Surface Mount TQFN-EP 16 2mA 3 x 3 x 0.75mm 3mm 3mm 0.75mm 3.6 V +85 °C
RS Stock No. 761-9547
Mfr. Part No.LTC4090EDJC#PBF
HK$67.08
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. 165-8557
Mfr. Part No.AP2145SG-13
HK$3.935
Each (On a Reel of 2500)
units
Low Side 2 140mΩ Internally Limited Surface Mount SOIC 8 1A 4.95 x 3.95 x 1.5mm 4.95mm 3.95mm 1.5mm 5.5 V +85 °C
New
RS Stock No. 205-2423
Mfr. Part No.NCV81599MWTXG
HK$19.792
Each (In a Pack of 5)
units
Adjustable 2 - 4.1 W Surface Mount QFNW-32 32 - - - - - - -
RS Stock No. 165-8558
Mfr. Part No.AP2191SG-13
HK$4.275
Each (On a Reel of 2500)
units
High Side 2 115mΩ Internally Limited Surface Mount SOIC 8 2.6A 4.95 x 3.95 x 1.5mm 4.95mm 3.95mm 1.5mm 5.5 V +85 °C
RS Stock No. 822-8830
Mfr. Part No.AP2401MP-13
HK$2.641
Each (In a Pack of 25)
units
High Side 2 135mΩ Internally Limited Surface Mount MSOP 8 2.85A 3.1 x 3.1 x 0.95mm 3.1mm 3.1mm 0.95mm 5.5 V +85 °C
RS Stock No. 165-4087
Mfr. Part No.MIC2026-1YM
BrandMicrochip
HK$6.831
Each (In a Tube of 95)
units
High Side, USB Power Distribution 4 90mΩ Internally Limited Surface Mount SOIC 8 0.9A 5 x 3.99 x 1.63mm 5mm 3.99mm 1.63mm 5.5 V +85 °C
RS Stock No. 146-4908
Mfr. Part No.AP22814AW5-7
HK$3.162
Each (In a Pack of 10)
units
High Side 1 65mΩ - Surface Mount SOT25 5 3.8A 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm 2.4 V +85 °C
RS Stock No. 147-360
Mfr. Part No.TPS2061D
HK$14.63
Each (In a Pack of 5)
units
High Side, USB Power Distribution 4 70mΩ 585.82 mW Surface Mount SOIC 8 1.5A 4.9 x 3.91 x 1.58mm 4.9mm 3.91mm 1.58mm 5.5 V +85 °C
RS Stock No. 190-6493
Mfr. Part No.MAX4906FELB+T
HK$31.55
Each (In a Pack of 2)
units
High/Full-Speed USB - 423.7 mW Surface Mount μDFN 10 - 2.05 x 2.05 x 0.55mm 2.05mm 2.05mm 0.55mm 3.6 V +85 °C
RS Stock No. 824-5490
Mfr. Part No.AP2152MPG-13
HK$12.41
Each (In a Pack of 5)
units
High Side 2 150mΩ Internally Limited Surface Mount MSOP 8 1A 3.1 x 3.05 x 0.95mm 3.1mm 3.05mm 0.95mm 5.5 V +85 °C
RS Stock No. 146-4707
Mfr. Part No.AP22814AW5-7
HK$2.266
Each (On a Reel of 3000)
units
High Side 1 65mΩ - Surface Mount SOT25 5 3.8A 3.1 x 1.7 x 1.3mm 3.1mm 1.7mm 1.3mm 2.4 V +85 °C
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