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TS4268 Datenblatt(PDF) 2 Page - Taiwan Semiconductor Company, Ltd

Teilenummer TS4268
Bauteilbeschribung  180mA Ultra Low Dropout Voltage Regulator with Reset & Watchdog Function
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Hersteller  TSC [Taiwan Semiconductor Company, Ltd]
Direct Link  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS4268 Datenblatt(HTML) 2 Page - Taiwan Semiconductor Company, Ltd

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Preliminary
TS4268
180mA Ultra Low Dropout Voltage Regulator
with Reset & Watchdog Function
2/7
Version: Preliminary
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 externally scaled
down output voltage at the reset threshold input drops below 1.35V, the external reset delay capacitor is discharged by
the reset generator. If the voltage on the capacitor reaches the lower threshold VST, a reset signal is generated on the
reset output and not cancelled again until the upper threshold voltage is exceeded. If the reset threshold input is
connected to GND, reset is triggered at an output voltage of 4.5V. A connected microcontroller is monitored by the
watchdog logic. If pulses are missing, the rest output is set to low. The pulse sequence time can be set within a wide
range with the reset delay capacitor. TS4268 is also incorporates a member of internal circuits for protection against:
• Over load
• Over temperature
• Reverse polarity
Block Diagram


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