ST1S31 is a 3A DC step-down switching regulator from ST. It adopts internally compensated 1.5MHz fixed-frequency PWM synchronous step-down circuit, with input voltage range of 2.8V~5.5V and output voltage adjustable range of 0.8V~VIN. It has a 60mΩ high-side switch and a 45mΩ synchronous rectifier, which can achieve high efficiency and low output voltage.
The ST1S31 is an internally compensated 1.5 MHz fixed-frequency PWM synchronous step-down regulator designed for high efficiency and low output voltages. It integrates a 60 mΩ high-side switch and a 45 mΩ synchronous rectifier, allowing for a compact solution with a minimum component count. The device operates from a 2.8 V to 5.5 V input voltage range and regulates an output voltage as low as 0.8 V.
| Output current | 3 A |
|---|---|
| Input voltage range | 2.8 V to 5.5 V |
| Output voltage range | 0.8 V to VIN |
| Switching frequency | 1.5 MHz |
| Maximum limiting current | 4.0 A |
| Operating junction temperature | -40 to 150 °C |
The ST1S31 operates at a fixed switching frequency of 1.5 MHz.
The device operates from an input voltage range of 2.8 V to 5.5 V.
The output voltage is adjustable from a minimum of 0.8 V.