TECHNICAL DATA
5-V Low-Drop Fixed Voltage Regulator
ILE4268
Features
• Output voltage tolerance < ± 2 %
• Very low current consumption
• Low-drop voltage
• Watchdog
• Settable reset threshold
• Overtemperature protection
• Reverse polarity protection
• Short-circuit proof
• Suitable for use in automotive electronics
• Wide temperature range
Functional Description
This device is a 5-V low-drop fixed-voltage regulator. The maximum input voltage is 45
V. It can deliver an output current of at least 180 mA. The IC is short-circuit proof and
features temperature protection that disables the circuit in the event of impermissibly high
temperatures. The watchdog function is disabled as a function of the load, so that a
controller is not interrupted during sleep mode by a watchdog reset.
Application Description
The IC regulates an input voltage V, in the range 5.5 V < V, < 45 V to Vqrated = 5-O V.
In the event of an output voltage VQ < VRT, a reset signal is generated. The wiring of the
reset switching threshold input enables the value of VRT to be reduced. The reset delay
time can be adjusted using an external capacitor. The integrated watchdog monitors the
connected active controller. If there is no positive-going edge at the watchdog input, the
reset output is set to low. The reset delay capacitor provides a wide adjustment range for
the pulse repetition time. The watchdog function is only activated if the load exceeds 8 mA.
This ensures that a microcontroller is not activated during power-down and the current
drain is not increased. The IC is protected against overload and overtemperature.
January, 2011, Rev. 01
IKSEMICON [ IK SEMICON CO., LTD ]
