SY21072B1ABC

•  Low RDS(ON) for internal switches (top/bottom):130/120 mΩ
• 4.5-18V input voltage range
• 2A load current capability
• Instant PWM architecture to achieve fast transient responses 
• Internal soft-start limits the inrush current
• 2% 0.6V reference
• Cycle-by-cycle peak current limitation
• RoHS Compliant and Halogen Free
• Compact package: SOT23-6

 SY21072B1 develops high efficiency synchronous step-down DC-DC converter capable of delivering 2A load current. SY21072B1 operates over a wide input voltage range from 4.5V to 18V and integrates main switch and synchronous switch with very low R_DS(ON) to minimize the conduction loss.

SY21072B1 adopts the instant PWM architecture to achieve fast transient responses for high step down applications and high efficiency at light loads. In addition, it operates at pseudo-constant frequency of 500kHz under heavy load conditions to minimize the size of inductor and capacitor.