Datasheet Summary
High Efficiency, 1200kHz, 3A, 18V Input Synchronous Buck Converter
General Description
Features
The SY81153C high efficiency 1200kHz synchronous buck converter operates over a wide input voltage range of 4V to 18V, and can deliver an output current up to 3A. It integrates a top MOSFET and a bottom MOSFET with very low RDS(ON) to minimize conduction loss. The 1200kHz pseudo-constant switching frequency enables using small external inductor and capacitor values.
The SY81153C uses constant on-time and ripple-based control strategy to achieve fast transient response for applications with variable duty cycle, and high efficiency at light loads. 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 SY81153C is available in a pact SOT563 package.
- Low RDS(ON) for Internal MOSFETs: 65mΩ Top, 30mΩ Bottom
- Wide Input Voltage Range: 4V ~ 18V
- Up to 3A Output Current
- Precise ±1% 0.6V Reference under -40°C~125°C
- Precise EN Threshold
- PFM Light Load Operation for High Efficiency
- Internal Soft-Start Limits the Inrush Current
- 1200kHz 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: SOT563
- Moisture Sensitivity Level (MSL): 1
Applications
- Set Top Box
- Portable TV
- DSL...