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Rich function

Toshiba Load switch ICs incorporate various functions such as inrush current limiting, reverse-current protection, overcurrent protection, thermal shutdown and automatic output discharge that are complicated to build with discrete components.

Overcurrent protection

Essentially, this feature protects the product from damage when short circuit occurs at the output VOUT pin. It is also known as current limit. Toshiba Load switch ICs employ a fold back type circuit. 

Overcurrent protection
Overcurrent protection

Inrush current reduction circuit (Slew Rate Control Driver)

The slew rate control driver is used to control inrush current caused by switching transients. The inrush current caused by each individual switching can cause the PM-IC which provides power supply to a range of devices, to temporary exceed its maximum available current, causing it to shutdown or result in operation error and system trouble. Also, a similar situation might occur on the load side, such that an inrush current reduction circuit is required.

Inrush current can be reduced by selecting a slew rate (fixed) suitable for the load.
Inrush current can be reduced by selecting a slew rate (fixed) suitable for the load.

Reverse Current Blocking

In addition to the ON / OFF state of the output N-ch MOSFET, when the input voltage VIN is within the operating range, always monitor the output voltage VOUT to prevent reverse current from VOUT to VIN. The reverse current blocking circuit prevents destruction of the power supply etc. connected to the VIN pin.

Thermal Shutdown

The circuit prevents excessive heating and damage to the device caused by unintentional current and large load current, and also from increase in ambient temperature. The internal temperature sensing circuit detects when temperature exceeds the specified temperature, and turns the output transistor ON/OFF. For TCK10xG series, this specified temperature is above the absolute maximum chip junction rating (Tj) of 150℃.

Thermal Shutdown circuit image
Thermal Shutdown circuit image

Load Switch ICs Selection List by function

Series VIN
Overcurrent protection Inrush current reduction  (Slew Rate Control Driver)
Reverse Current Blocking Thermal Shutdown Overvoltage Protection Auto Discharge
TCK106xx 1.1 to 5.5 1
TCK107xx 1.1 to 5.5 1
TCK108xx 1.1 to 5.5 1
TCK111G 1.1 to 5.5 3
TCK112G 1.1 to 5.5 3
TCK2292xG 1.1 to 5.5 2
TCK2297xG 1.1 to 5.5 2
TCK22910G 1.1 to 5.5 2
TCK22911G 1.1 to 5.5 2
TCK22891G 1.1 to 5.5 0.4
TCK22892G 1.4 to 5.5 0.74
TCK22893G 1.4 to 5.5 1.11
TCK22894G 1.4 to 5.5 1.54
TCK22946G 1.1 to 5.5 0.4
TCK22951G 1.4 to 5.5 0.74
TCK2065G 1.4 to 5.5 1.11
TCK1024G 1.4 to 5.5 1.54
TCK206G 0.75 to 3.6 2
0.75 to 3.6 2
TCK30xG 2.3 to 28 3
TCK32xG 2.3 to 36 2


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·Before creating and producing designs and using, customers must also refer to and comply with the latest versions of all relevant TOSHIBA information and the instructions for the application that Product will be used with or for.