Load Switch IC TCK301G, TCK302G, TCK303G Application & Circuit

This reference design provides example circuit of the load switch with low on resistance and built-in in-rush current control function. It is suitable for battery used application.

Main switch of a rapid-charging circuit of load switch IC TCK301G, TCK302G, TCK303G application & circuit.


  • Small package: 0.5 mm pitch WCSP9 ( 1.5 mm x 1.5 mm, t: 0.5 mm (Typ.)) , PD = 1.65 W
  • High input voltage: VIN (Max) = 28 V
  • High output current: IOUT (DC) = 3.0 A
  • Low ON resistance : RON = 73 mΩ (Typ.) at VIN = 4.5 V, IOUT = - 1.0 A
  • Inrush current reducing circuit ( slew rate control )
  • Over voltage lockout circuit : 6.6 V at 301G, 10.5 V at 302G, and 15.5 V at 303G (Typ.)
  • Under voltage lockout circuit: 2.9 V (Typ.)


  • Operation and application of the slew rate control circuitry designed for inrush current limiting
  • Main switches of USB PD-enabled rapid-charging circuits for electronic devices with USB Type-C™ ports
  • Main switches of 5- to 12-V power supply input circuits that support various modes of rapid charging and wireless power transfer
  • Switches for the power management of systems requiring power-saving modes
Vout and Iout waveforms of load switch IC TCK301G, TCK302G, TCK303G application & circuit.
Vout and Iout waveforms

Design Documents

Design Documents contain the documents below.

Design Data

Design Data contains the contents listed below.

Used Toshiba Items

Part Number Device Category Portion Usage Description
ESD protection diode (standard type, single) 1 Unidirectional TVS Diode (ESD Protection Diode), 21 V, SOD-963(CST2C)

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