SC2446: Dual-Phase Single or Two-Output Synchronous Step-Down Controller

• 2-phase synchronous continuous conduction mode for high-efficiency step-down converters
• Out-of-phase operation for low-input current ripples
• Output source and sink currents
• Fixed-frequency peak current-mode control
• 75 mV/-110 mV maximum current-sense voltage
• Synthesized MOSFET R_DS(ON) current-sensing for low-cost applications
• Optional resistor current-sensing for precise current limit
• Dual outputs or 2-phase single output operation
• Excellent current sharing between individual phases
• Wide input voltage range: 4.7 V to 16 V
• Individual soft-start, overload shutdown and enable
• Duty cycle up to 88%
• 0.5 V feedback voltage for low-voltage outputs
• External reference input for DDR applications
• Buffered V_DDQ/2 output
• Programmable frequency up to 1 MHz per phase
• External synchronization
• Industrial temperature range
• 28-lead TSSOP-EDP package

Typical Application Circuit

Click diagram to enlarge

• Telecommunication power supplies
• DDR memory power supplies
• Graphic power supplies
• Servers and base stations

TSSOP-28-EDP

• SC2446ITETRT: Lead-Free, RoHS and WEEE Compliant, Package Minimum Tape & Reel Only
• SC2446ITSTRT: Lead-Free, RoHS and WEEE Compliant, Package Minimum Tape & Reel Only