Datasheet TCK128BG (Toshiba) - 5

TCK128BG Application Note 1. Application circuit example (top view)
The figure below shows the example of configuration for TCK128BG.
CONTROL GND Control IC Part number LOAD voltage Operation VIN VOUT Low ON TCK128BG C High OFF IN CL RL
1) Input capacitor An input capacitor (CIN) is not necessary for the guaranteed operation of TCK128BG. However, it is recommended to use input capacitors to reduce voltage drop due to sharp changes in output current and also for improved stability of the power supply. When used, place CIN as close to VIN pin to improve stability of the power supply. Also, due to the CIN selected, VIN < VOUT may occur, causing a reverse current to flow through the body diode of the pass-through p-ch MOSFET of the load switch IC. In this case, a higher value for CIN as compared to CL is recommended. 2) Output capacitor An output capacitor (COUT) is not necessary for the guaranteed operation of TCK128BG. However, there is a possibility of overshoot or undershoot caused by output load transient response, board layout and parasitic components of load switch IC. In this case, an output capacitor with COUT more than 0.1μF us recommended. 3) Control pin A control pin for TCK128BG is Active Low. This pin controls both the pass-through p-ch MOSFET and the discharge n- ch MOSFET, operated by the control voltage (VCT). The control pin is equipped with Schmitt trigger. When the control voltage level is High, p-ch MOSFET is OFF state and discharge n-ch MOSFET is ON state. When control voltage level is Low , and the state of the MOSFETs is reversed. In addition, Control pin has a tolerant function such that it can be used even if the control voltage is higher than the input voltage. 4) Control voltage for Low Quiescent current If there is a difference between the control voltage and the input voltage, the current consumption may increase due to the circuit configuration. Therefore, it is recommended to use same voltage with VIN or 0 V as the control voltage for use with ultra-low current consumption. 5) Low input voltage and output voltage attenuation When TCK128BG is used at a low VIN voltage, the RON becomes high, so there is output voltage attenuation when a large current flows. Therefore, carefully check the required output current and output voltage before use. 6) Assembly If you use potting materials that contain halogen groups such as sulfur and chlorine, characteristic defects may occur due to corrosion or conductive ions. Therefore, do not use potting materials that contain halogen groups such as sulfur or chlorine. Also, regarding the use of potting materials, be sure to thoroughly check the electrical characteristics and reliability tests of the customer before use. This product has a back side coating (BSC), but it does not provide complete protection from mechanical impacts. When picking up or testing the product, be very careful not to damage it. © 2021 5 2021-10-28 Toshiba Electronic Devices & Storage Corporation