• Input Range: 4.5-30V
• Programmable Pseudo-constant Frequency
• Low R_DS(ON) Internal Switch

Main FET: 16mΩ

Rectified FET: 18mΩ

Disconnection FET: 18mΩ

• True Shutdown Function
• Programmable Output Current Limit
• Internal Soft-start Limits the Inrush Current
• Input Voltage UVLO
• Over Temperature Protection
• Over Voltage Protection
• Output Short Circuit Protection
• Minimum ON Time: 100ns typical
• Minimum OFF Time: 120ns typical
• RoHS Compliant and Halogen Free
• Compact Package:QFN4×4-18

The SY21225 is a high efficiency synchronous boost regulator with programmable output current limit. The device uses adaptive constant off time and current mode control. The integrated low RDS(ON) switches minimize the conduction loss.

The SY21225 features cycle-by-cycle peak current limit, output short circuit protection and true shutdown. The device also provides enable control and a power good indicator which can be used for system power sequencing. Low output voltage ripple and small external inductor and capacitor sizes can be achieved with a resistor programmable pseudo-constant frequency.

The SY21225 is available in a 4 mm x 4mm QFN package.