ILE4260-2_11 Datasheet, PDF (3/9 Pages) IK Semicon Co., Ltd – 5-V Low-Drop Voltage Regulator

ILE4260-2
Circuit Description
The control amplifier compares a reference voltage, which is kept highly accurate
by resistance adjustment, to a voltage that is proportional to the output voltage and
drives the base of the series transistor via a buffer. Saturation control as a function of
the load current prevents any over-saturation of the power element. If the output
voltage goes below 96% of its typical value, an external capacitor is discharged on pin
4 by the reset generator. If the voltage on the capacitor reaches the lower threshold
VST, a reset signal is issued on pin 2 and not cancelled again until the upper threshold
VDT is exceeded. For an output current of less than IQN Off = 10 mA the standby
changeover turns off the reset generator. The latter is turned on again when the output
current increases, the output voltage drops below 4.2 V or the delay capacitor is
discharged by external measures.
The IC also incorporates a number of internal circuits for protection against:
• Overload
• Overvoltage
• Overtemperature
• Reverse polarity
Block Diagram
January, 2011, Rev. 01