Description
The SMP402, intended for non-isolated ISDN telecommunications power supply applications, combines a high voltage power MOSFET switch with a switchmode power system controller in a monolithic integrated circuit. Few external components are required to implement a low cost power supply which meets stringent ISDN specifications. High frequency operation reduces total power supply size.

Product Highlights
Integrated Power Switch and CMOS Controller
• Output power > 1 W from 48 VDC input
• Adjustable output voltage
• Integrated solution minimizes overall size

High-voltage, Low-capacitance MOSFET Output
• Designed for ISDN T1 telecommunications applications
• Low capacitance allows for high frequency operation

High-voltage Buck Regulator
• Internal pre-regulator self-powers the IC on start-up
• Designed for low power consumption
• Minimum external parts required

Built-In Self-protection Circuits
• Undervoltage lockout
• Thermal shutdown
• Input polarity/level sense