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USB Switches

There are two main roles of USB. Recently, USB switch IC is used as aload switch with protections.

1. USB Power Line's ON/OFF Control

By the enable signal from another device such as a USB Host Controller, the USB switch turn on the USB power line with suppressing inrush current with soft-start function. On the contrary, by the disable signal, the USB switch cut off the power line with or without auto-discharge function (Option).

2. USB Power Line Protection

There is protection capability against the abnormal heating in the USB switch, and if preset over-current is detected, output current is limited or power is cut off and latched for protection.

R5524x Typical Application

*1) FLG pin has N-channel open drain output, therefore pull-up resistance is necessary when it is used. The output of FLG pin becomes "L" when the thermal shutdown or over-current limit-function works.

*2) According to the USB standard,120µF or more capacitor attachment is recommended, however, as an IC, changing capacitor is acceptable considering other usage.

USB Switch Lineup

Product Name ON
Operating Voltage Range UVLO Detect Voltage Current Limit Threshold Short Current Limit Internal
Package Datasheet
Typ. Typ. Typ. Typ.
R5520 100 mΩ 20 µA 4.0 V to 5.5 V 2.2 V 1.2 A 750 mA Pch SOT-89-5 Consumer
R5523 130 mΩ 20 µA 2.2 V to 5.5 V 1.8 V 1 A 750 mA Pch SOT-23-5 Consumer
R5524 100 mΩ 110 µA 2.7 V to 5.5 V 2.4 V 800 mA 650 mA Nch DFN(PLP) 1820-6

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