NCP4640 50 mA, Wide Input Range, Voltage Regulator The NCP4640 is a CMOS 50 mA linear voltage regulator with high input voltage and ultralow supply current. It incorporates multiple protection features such as peak current limit, short circuit current NCP4640 VIN VOUT Internal VR Vref Current Limit Short Protection CE Thermal Shutdown GND Figure 2. Simplified Schematic Block Diagram PIN FUNCTION DESCRIPTION Pin No. Pin No. SOT89 SOIC6TL Pin Name Description 5 6 VIN Input pin 2 2 GND Ground pin, all ground pins must be connected together when it is mounted on board 4 4 GND Ground pin, all ground pins must be connected together when it is mounted on board 5 GND Ground pin, all ground pins must be connected together when it is mounted on board 3 3 CE Chip enable pin (H active) 1 1 VOUT Output pin