Datasheet Summary
High Efficiency, 2A, 18V Input Synchronous Buck Converter
General Description
The SY81057T 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 SY81057T is available in a pact SOT23-6 package.
Features
- Low RDS(ON) for Internal MOSFETs: 130mΩ Top, 105mΩ Bottom
- Wide Input Voltage Range: 4.5V ~ 18V
- Up to 2A Output Current
- ±1% 0.765V Reference
- Precise EN Threshold
- Pulse-Frequency Modulation (PFM) Mode
Operation
- Internal Soft-Start Limits the Inrush Current
- Support Smooth Startup with Pre-Biased Output
- 500kHz Switching Frequency Minimizes the
External ponents
- Constant On-time and Ripple-Based Control to
Achieve Fast Transient Responses
- Cycle-by-Cycle Valley and Peak Current Limit
Protection
- Hic-Cup Mode Output Under Voltage Protection
- Auto-Recovery Mode Over Temperature Protection
- Input Under Voltage Lockout (UVLO)
- RoHS-pliant and Halogen-Free
- pact Package: SOT23-6
- MSL Rating: MSL1 (SOT23-6)
Typical Application
VIN = 4.5V ~ 18V CIN...