Conv DC-DC Single Step Up -10V to -60V 8-Pin SOIC N Bulk

The Si9121DY-5 simplifies the -48-V to +5-V or +3.3-V converter design for ISDN application by integrating the floating feedback error amplifier providing direct output voltage regulation. This approach eliminates the need for an external shunt regulator. The Si9121DY-5 also integrates a high voltage depletion mode MOSFET which allows the converter to be powered directly from the high input bus voltage without requiring an external start-up circuit. Combined with simple magnetic design due to its non-isolated topology, the Si9121DY-5 provides a one-chip solution for complete ISDN power supply. In order to reduce external component count, the Si9121DY-5 has a fully integrated 95-kHz oscillator and soft-start circuit.The Si9121DY-5 is available in both standard and lead (Pb)-free SOIC-8 pin packages.In order to satisfy the stringent ambient temperature requirements in many applications, the Si9121DY-5 is rated to the industrial temperature range of -40°C to 85°C.

• Fixed +5-V Output
• Integrated Floating Feedback Amplifier
• On-Chip 70-V, 1.5- N-Channel MOSFET Switch
• Integrated High Voltage Start-Up Circuit, with VCC Regulator
• -10V to -60V Input Voltage Range
• 95-kHz PWM Operation
• Integrated Soft-Start and Oscillator
• High Efficiency Over Full Load Range
• Under Voltage Lockout
• Current Mode Control
• Hiccup Mode Short Circuit Protection
• Thermal Shutdown
• SOIC-8 Narrow-Body Package