SY81102B Datasheet | Silergy

SY81102, SY81102E, SY81102C, SY81102B High Efficiency, 2A, 18V Input Synchronous Buck Converter General Description The SY81102x is high efficiency synchronous buck converter operates over a wide input voltage range of 4.5V to 18V, and can deliver an output current up to 2A. It integrates a top MOSFET and a bottom MOSFET with very low RDS(ON) to minimize conduction loss. The high pseudo-constant switching frequency enables using small external inductor and capacitor values. The device uses constant on-time and ripple-based control strategy to achieve fast transient response for applications with high step-down ratios. It also provides cycle-by-cycle current limit protection, output under voltage protection and over temperature protection. Only the input and output capacitors, inductor, feedback resistor divider and feedforward capacitor need to be selected for the targeted application specifications. The SY81102x is available in a pact SOT23-6 package. Part Number SY81102ABT SY81102EABT SY81102CABT SY81102BABT Frequency 500k Hz 500k Hz 1200k Hz 1400k Hz Mode PFM FCCM PFM FCCM Features - Low RDS(ON) for Internal MOSFETs: 130mΩ Top, 105mΩ Bottom - Wide Input Voltage Range: 4.5V ~ 18V - Up to 2A Output Current - ±1.5% 0.6V Reference - Precise EN Threshold - Pulse-Frequency Modulation (PFM) Mode Operation for SY81102 and SY81102C - Forced Continuous Conduction Mode (FCCM) Operation for SY81102E and SY81102B - Internal Soft-Start Limits the Inrush Current - Support Smooth Startup with Pre-Biased Output - 500k Hz Switching Frequency Minimizes the External ponents for SY81102 and SY81102E - 1200k Hz Switching Frequency Minimizes the External ponents for SY81102C - 1400k Hz Switching Frequency Minimizes the External ponents for SY81102B - Constant On-time and Ripple-Based Control to Achieve Fast Transient...