SY83088C Datasheet | Silergy

High Efficiency Fast Response, 8A, 28V Input, Fixed 5.1V Output Synchronous Buck Converter with 100m A 5V LDO General Description The SY83088C develops a high efficiency synchronous Buck converter capable of delivering 8A current. It integrates the top MOSFET and the bottom MOSFET with very low RDS(ON) to minimize the conduction loss. In addition, it operates at pseudo-constant frequency of 600k Hz under CCM condition to minimize the size of inductor and capacitor. The SY83088C also provides a fixed 5V LDO with 100m A current capability, which can be used to power the external peripheries. The 5V LDO can switch to Buck converter output to reduce power loss. Silergy’s constant on-time and ripple-based control strategy supports high input/output voltage ratios (low duty cycles), and fast transient response while maintaining a near constant operating frequency over line, load and output voltage ranges. This control method provides stable operation without plex pensation and even with low ESR ceramic capacitors. The SY83088C operates over a wide input voltage range from 5.5V to 24V. Cycle-by-cycle current limit, input under voltage lockout, internal soft-start, output under voltage protection, over voltage protection and over temperature protection provide safe operation in all operating conditions. Typical Applications VIN : 5.5V ~ 24V CIN IN CIN ON/OFF ON/OFF CVCC EN1 EN2 VCC PG BS LX OUT FF LDO PG (Open Drain Output) CBS L CLDO VLDO VOUT COUT Figure1. Schematic Diagram Features - Low RDS(ON) for Internal MOSFETs: 20mΩ Top, 10mΩ Bottom - Wide Input Voltage Range: 5.5V ~ 24V - Fixed 5.1V Output Voltage - Large Duty Cycle On-Time Stretch - 8A Continuous Output Current Capability - 100m A LDO Current Capability - 600k Hz Pseudo-Constant Frequency - ±1.5% Internal Reference Voltage - Internal 0.8ms Soft-Start Limits the Inrush Current - Constant On-Time and Ripple-Based Control to Achieve Fast Transient...