7/19

XC8102

Series

<CE Pin>

The XC8102 enables an output P-channel MOSFET switch and the IC internal circuitry to turn off by the signal to the CE pin. In

The output voltage becomes unstable when the CE pin is opened. If the input voltage to the CE pin is within the specified

threshold voltages, the logic is fixed and the XC8102 will operate normally. However, supply current may increase as a result

of the shoot-through current of internal circuitry when the medium level voltage is input to the CE pin.

＜

Input/Output Capacitor＞

The XC8102 works well without an input and output capacitors. Also, an output capacitor of the power source can be used as

an input capacitor of the XC8102 and a bypass capacitor of the driving IC can be used as an output capacitor of the XC8102.

<CL Auto-Discharge Function>

constant τ is defined as (τ = C x Rdischg). Output voltage after starting discharge can be calculated by the following

formula.

V: Output voltage after starting discharge,

t : Discharge time,

<Current Limiter, Short-Circuit Protection>

The XC8102 series contains a constant current limiter and fold-back current circuitry. The constant current limiter operates to

limit output current and the fold-back current circuitry operates as short circuit protection for the output pin.

When the load current reaches the limit current, the constant current limiter operates and the output voltage drops. The output

voltage further, then the fold-back current circuitry operates to decrease the output current.

When the output pin is

short-circuited to the ground, the output current drops and maintains a flow about 30mA.

■NOTES ON USE

■OPERATIONAL EXPLANATION

1.

Please use this IC within the stated absolute maximum ratings. Operation beyond these limits may cause degrading or

permanent damage to the device.

2.

The X8102 goes into an undefined operation when the CE pin is left open. The CE pin shall be tied to low or high level.

3.

4.

Current limit function is integrated. However, power dissipation may be beyond the limit before starting a fold-back current

protection when used in high temperature. For the power dissipation of each package, please refer to the graphs of Package

Power vs. Operating Temperature in page 15 to 18.