The ST1S15 is a high efficiency miniaturized step-down converter able to provide 500 mA output current from an input voltage from 2.3 to 5.5. This converter is specifically designed for applications where high efficiency and small application area are the key factors. With an output voltage as low as 0.6 V the device supports low voltage DSPs and processors core supply. Due to the 6 MHz switching frequency the ST1S15 can use nominal values of 470 nH for the inductor and 4.7 µF for the output capacitor, providing, at the same time, very good performance in terms of load and line transients. It is possible to select a PFM mode for high efficiency under light load conditions or PWM mode for tight regulation and best dynamic performance. Short-circuit and thermal protection are included.
The ST1S15 is a high-efficiency, miniaturized synchronous step-down converter designed to provide up to 500 mA of output current from an input voltage range of 2.3 V to 5.5 V. It features a switching frequency of 6 MHz, allowing for the use of small external components like 470 nH inductors and 4.7 µF capacitors. The device supports both Pulse Frequency Modulation (PFM) and Pulse Width Modulation (PWM) operation to optimize efficiency across the entire load range.
| Output current | 500 mA |
|---|---|
| Switching frequency | 6 MHz |
| Input voltage range | 2.3 V to 5.5 V |
| Quiescent current (PFM) | 45 µA |
| Efficiency | 85% typical |
| Operating temperature | -40 to 85 °C |
| Packages | Flip Chip 6, DFN6 (2 x 2 mm) |
The ST1S15 operates at a switching frequency of 6 MHz.
Yes, it supports PFM or PWM operation for best efficiency over the whole load range.
Standard versions include 1.82 V and 2.8 V, with other voltages available on request.