ST1S03PUR

Voltage Regulators - DC DC Switching Regulators Overview

The ST1S03PUR is a synchronous step-down switching regulator manufactured by STMicroelectronics. It delivers an output current of up to 1.5 A with an adjustable output voltage range from 0.8 V to 4.79 V. The device operates with an input voltage between 2.7 V and 5.5 V at a fixed switching frequency of 1.5 MHz. It features integrated power switches, eliminating the need for external Schottky diodes. The component is housed in a compact 6-DFN (3x3 mm) package with an exposed thermal pad.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrated synchronous rectification using internal N-channel MOSFETs for high efficiency
• Fixed 1.5 MHz switching frequency enabling the use of small external components
• Adjustable output voltage via external resistor divider network
• Built-in soft-start circuitry limits inrush current during startup

Voltage Regulators - DC DC Switching Regulators Applications

• Portable consumer electronics powered by single-cell lithium-ion batteries
• Embedded systems requiring efficient voltage regulation from 3.3 V or 5 V rails
• Industrial control modules operating within standard low-voltage ranges

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'PUR' to confirm lead-free packaging and RoHS compliance status. Confirm availability as this part may be subject to discontinuation notices. Ensure the ordering quantity matches the manufacturer's standard reel size requirements. Cross-reference the datasheet revision date to validate technical specifications against current production standards.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact solution is required for converting 3V to 5V inputs to lower logic voltages. The 1.5A current capability suits moderate load applications without excessive heat dissipation. Consider the 6-DFN footprint constraints during PCB layout planning. Evaluate thermal performance requirements given the exposed pad design for heat sinking.

Voltage Regulators - DC DC Switching Regulators Part Context

This regulator belongs to the ST1S03 series of monolithic DC-DC converters. It is designed for space-constrained applications where high efficiency and minimal external component count are critical. The series utilizes current mode control architecture to ensure stable operation across varying load and line conditions.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

ST1S03APUR is documented as a similar alternative within the same product family.