• Wide 2V to 6V Input Range
• Up to 6V Output Voltage
• Low RDS(ON) for Internal N-Channel MOSFET: 120mΩ
• 2.5A Minimum Switch Current Limit
• 1MHz Switching Frequency 
• Minimum On-Time: 100ns Typical
• Minimum Off-Time: 100ns Typical 
• Internal Soft-Start Limits Inrush Current
• ±2% 0.6V Reference
• RoHS-Compliant and Halogen-Free
• Compact SOT23-6 Package

The SY21242 high efficiency step-up regulator operates using current mode control, over an input voltage range from 2V to 6V. It integrates an N-channel MOSFET with low 120mΩ RDS(ON) to minimize conduction loss.

The 1MHz switching frequency and internal compensation reduce external component count and save PCB space, and the built-in internal soft-start circuitry minimizes inrush current at startup.

The SY21242 is available in a compact SOT23-6 package.