UPC2255

DATA SHEET SHEET DATA BIPOLAR ANALOG INTEGRATED CIRCUIT µPC2250 SERIES LOW-SATURATED STABILIZED POWER SUPPLY WITH SYSTEM RESET PIN DESCRIPTION The µPC2250 series is a collection of low-saturated 4-pin stabilized power supplies with a pin that outputs a reset signal when a drop in the input voltage is detected. Because the reverse leakage current of these power supplies is about 1 µA even if a voltage is applied to the output pin when the input voltage is cut off, these power supplies are ideal for systems with on-board microprocessors requiring battery backup. FEATURES Low minimum voltage difference between input and output VDIF = 0.15 V TYP. (at IO = 40 mA) Outputs reset signal (active-low) when the input voltage or output voltage drops. Low reverse leakage current during back up IOLK = 1 µA TYP. Low circuit operating current under no load IBIAS = 1.3 mA TYP. PIN CONFIGURATION (Marking Side) 4-pin plastic SIP (TO-126) µPC2251H, 2253H, 2255H 1: INPUT 1 2 3 4 2: RESET 3: GND 4: OUTPUT ORDERING INFORMATION Part Number Package 4-pin plastic SIP (TO-126) 4-pin plastic SIP (TO-126) 4-pin plastic SIP (TO-126) Output Voltage 3V 5 V (TYPE1) 5 V (TYPE2) µPC2251H µPC2253H µPC2255H BLOCK DIAGRAM INPUT Overcurrent limiter circuit OUTPUT Starter circuit Reference voltage circuit Error amplifier circuit RESET Reset circuit GND The information in this document is subject to change without notice. Before using this document, please confirm that this is the latest ve...