SY20031 Datasheet | Silergy

Description The SY20031 high efficiency 1.5MHz synchronous buck converter operates over a wide input voltage range of 2.5V to 5.5V, and can deliver an output current up to 1A. It integrates a top MOSFET and a bottom MOSFET with very low RDS(ON) to minimize conduction loss. The 1.5MHz pseudo-constant switching frequency enables using small external inductor and capacitor values. The SY20031 uses constant-off time and peak current mode control strategy to achieve fast transient response and high efficiency at light loads. It also provides cycleby-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. Typical Application High Efficiency, 1.5MHz, 1A, 5.5V Input Synchronous Buck Converter Features - Low RDS(ON) for Internal MOSFETs: 260mΩ Top, 160mΩ Bottom - Wide Input Voltage Range: 2.5V ~ 5.5V - Up to 1A Output Current - ±1.5% 0.6V Reference - PFM Light Load Operation for High Efficiency - Internal Soft-Start Limits the Inrush Current - 1.5MHz Switching Frequency Minimizes the External ponents - Constant Off-time and Peak Current Mode Control to Achieve Fast Transient Responses - 100% Dropout Operation - Output Auto Discharge Function - Cycle-by-Cycle Peak Current Limit Protection - Hic-Cup Mode Output Under Voltage Protection - Auto-Recovery Mode Over Temperature Protection - Input Under Voltage Lockout (UVLO) - Ro HS-pliant and Halogen-Free - pact Package: SOT23-5 Applications - Set-Top Box - USB Dongle - Media Player - Smart Phone VIN: 2.5 ~ 5.5V CIN ON/ OFF L1 FB EN VOUT COUT Figure1. Schematic...