ST1S40 is a 18V-4.0V 3A PWM synchronous step-down regulator from ST company, it has a built-in 95mΩ high-side switch and 69mΩ synchronous rectifier, supports internal compensation, high integration and compact package VFQFPN4x4-8L, HSOP-8 and SO-8.
The ST1S40 is an internally compensated 850 kHz fixed-frequency PWM synchronous step-down regulator designed for uP/ASIC/DSP/FPGA core and I/O supplies. It operates from a 4.0 V to 18 V input voltage range and regulates an output voltage as low as 0.8 V. The device integrates a 95 mΩ high-side switch and a 69 mΩ synchronous rectifier to achieve high efficiency with a minimum component count.
| Output current | 3 A |
|---|---|
| Input voltage range | 4.0 V to 18 V |
| Output voltage range | 0.8 V to Vin |
| Switching frequency | 850 kHz |
| High-side switch resistance | 95 mΩ |
| Low-side switch resistance | 69 mΩ |
| Maximum limiting current | 6.0 A |
| Operating junction temperature | -40 to 150 °C |
The ST1S40 operates at a switching frequency of 850 kHz.
The device can regulate an output voltage as low as 0.8 V.
It is available in VFQFPN 4x4, HSOP-8, and SO-8 packages.