TCK321G Datasheet, PDF (8/13 Pages) Toshiba Semiconductor – 36 V, Dual Inputs – Single Output Power Multiplexer IC with Over Voltage Protection

Application Note
1. Application circuit example (top view)
TCK321G, TCK322G
VINA
CINA
1.0 μF
TCK321G
TCK322G
RUP
FLAG
VINB
VOUT
CINB
COUT
CL
1.0 μF ^{VSEL CNT}
1.0 μF
GND
LOAD
RL
1) Input and Output capacitor
An input capacitor (C_IN) and an output capacitor (C_OUT) are necessary for the stable operation of TCK321G and
TCK322G. And it is effective to reduce voltage overshoot or undershoot due to sharp changes in output current
and also for improved stability of the power supply. When used, place CIN and COUT more than 1.0 μF as close to
VIN pin to improve stability of the power supply.
2) Control pin
Control pins for TCK321G and TCK322G are operated by the control voltage and Schmitt trigger. VSEL pin has a
tolerant function such that it can be used even if the control voltage is higher than the input voltage.
2. Reverse current blocking
Reverse current blocking(SW OFF state) function is designed in these products. This function is active at output
n-ch MOSEFT turned off.
However these does not assure for the suppression of uprising device operation. In use of these products, please
read through and understand dissipation idea for absolute maximum ratings from the above mention or our
‘Semiconductor Reliability Handbook’. Then use these products under absolute maximum ratings in any condition.
Furthermore, Toshiba recommend inserting failsafe system into the design.
3. Thermal shut down function
Thermal shutdown function is designed in these products, but these does not assure for the suppression of uprising
device operation. In use of these products, please read through and understand dissipation idea for absolute
maximum ratings from the above mention or our ‘Semiconductor Reliability Handbook’. Then use these products
under absolute maximum ratings in any condition. Furthermore, Toshiba recommend inserting failsafe system into the
design.
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2015-10-20