·           Low R_DS(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

·           100mA LDO Current Capability 

·           600kHz 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 Responses

·           Integrated 1.5Ω Bypass Switch

·           PFM/USM Selectable Light Load Operation Mode

·           Power Good Indicator

·           Output Auto-Discharge Function

·           Cycle-by-Cycle Valley and Peak Current Limit Protection

·           Latch-Off Mode Output Under Voltage Protection for Buck

·           Latch-Off Mode Output Over Voltage Protection for Buck

·           Latch-Off Mode Over Temperature Protection for Buck

·           Auto-Recovery Mode Output Under Voltage Protection for LDO

·           Auto-Recovery Mode Over Temperature Protection for LDO

·           Input Under Voltage Lockout(UVLO)

·           RoHS Compliant and Halogen Free

·           Compact Package: QFN2.5×2.5-16

The SY21288C develops a high efficiency synchronous Buck converter capable of delivering 8A current. It integrates the top MOSFET and the bottom MOSFET with very low R_DS(ON) to minimize the conduction loss. In addition, it operates at pseudo-constant frequency of 600kHz under CCM condition to minimize the size of inductor and capacitor. The SY21288C also provides a fixed 5V LDO with 100mA 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 complex compensation and even with low ESR ceramic capacitors.  

The SY21288C 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.