• Low R_DS(ON) for Internal Switches (Top/Bottom): 110/70 mΩ
• 4.5-30V Input Voltage Range
• Internal Compensation
• Internal 1ms Soft-start Limits the Inrush Current
• Adjustable Switching Frequency Range: 500kHz to 2.5MHz
• 3AOutput Current Capability
• 1.5% 0.6V Reference
• Low Quiescent Current
• Cycle-by-cycle Peak Current Limit
• Short Circuit Protection
• Thermal Shutdown and Auto Recovery
• RoHS Compliant and Halogen Free
• Compact Package: TSOT23-8

The SY21154 develops a high efficiency synchronous step-down DC/DC converter capable of delivering 3A load current. The SY21154 operates over a wide input voltage range from 4.5V to 30V and integrates main switch and synchronous switch with very low R_DS(ON) to minimize the conduction loss.

The SY21154 adopts peak current control scheme. The switching frequency is adjustable from 500kHz to 2.5MHz using an external resistor. The device also features ultra low quiescent operating to achieve high efficiency under light load. And the internal soft-start limits inrush current during power on.

SY21154 is available in TSOT23-8 package.