SY8386B Datasheet | Silergy

High Efficiency Fast Response, 6A, 28V Input Synchronous Step Down Regulator with 100m A 3.3V LDO General Description The SY8386B develops a high efficiency synchronous step-down DC/DC regulator capable of delivering 6A current. The device integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. In addition, it operates at pseudoconstant frequency of 600k Hz under heavy load conditions to minimize the size of inductor and capacitor. SY8386B also provides a fixed 3.3V LDO with 100m A current capability, which can be used to power the external peripheries, such as the keyboard controller in notebook. The 3.3V LDO can switch over to Buck regulator output to save power loss. Silergy’s proprietary Instant-PWM™ fast-response, constant-on-time (COT) PWM control method 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 SY8386B operates over a wide input voltage range from 4.5V to 24V. Cycle-by-cycle current limit, input under voltage lock-out, internal soft-start, output under voltage protection, over voltage protection and thermal shutdown provide safe operation in all operating conditions. Ordering Information SY8386 - (- - )- Tempera ture Code Pa cka ge Code Optional Spec Code Ordering Number Package type Note SY8386BRHC QFN2.5×2.5-16 -- Features - Low RDS(ON) for Internal Switches (top/bottom): 36/18 mΩ - Wide Input Voltage Range: 4.5~24V - Integrated Bypass Switch: 1.2Ω - Instant PWM Architecture to Achieve Fast Transient Responses - Internal Soft-start Limits the Inrush Current - Pseudo-constant Frequency: 600k Hz - Fixed 3.338V Output Voltage - 6A Output Current Capability - 100m A LDO Current Capability - ±1% Internal Reference Voltage - PFM/USM Selectable Light Load...