• Low RDS(ON) for Internal Switches (Top/Bottom): 38/19 mΩ
• Wide Input Voltage Range: 4.5~24V
• Instant PWM Architecture to Achieve Fast Transient Responses 
• Internal Soft-start Limits the Inrush Current
• Pseudo-constant Frequency: 600kHz
• Adjustable Output Voltage Application
• 6A Output Current Capability
• ±1% Internal Reference Voltage
• Up to 99% Duty Cycle Operation
• PFM/FCCM Selectable Light Load Operation Mode
• Power Good Indicator
• Output Discharge Function
• Cycle-by-cycle Valley and Peak Current Limit Protection
• Programmable Valley Current Limit Threshold by ILMT Pin
• Hic-cup Mode Output Under Voltage Protection 
• Auto-recovery Mode Output Over Voltage Protection
• Auto-recovery Mode Over Temperature Protection
• Input UVLO
• RoHS Compliant and Halogen Free
• Compact Package: QFN2.5×2.5-16

The SY21138J develops a high efficiency synchronous step-down DC/DC regulator capable of delivering 6A current over a wide input voltage range of 4.5V to 24V.

The SY21138J can provide maximum 99% duty cycle operation.

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 complex compensation and even with low ESR ceramic capacitors.

The SY21138J 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 and soft-shutdown, output under voltage protection and over voltage protection, and thermal shutdown provide safe operation in all operating conditions.