ST1S09IPUR

Voltage Regulators - DC DC Switching Regulators Overview

The ST1S09IPUR is a synchronous step-down DC-DC converter from the ST1S09 family, manufactured by STMicroelectronics. It operates with an input voltage range of 2.7 V to 5.5 V and delivers up to 2 A output current. The device utilizes a fixed 1.5 MHz PWM switching frequency with current control mode. Key electrical parameters include a typical non-switching quiescent current of 1.5 mA, a typical R_DSON of 100 mΩ, and a DC output voltage tolerance of 2%. It features integrated output over-voltage protection and thermal shutdown. The component is housed in a DFN6 (3x3 mm) package and is supplied in cut tape or reel packaging.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates synchronous rectification to minimize external component count, requiring only a resistor divider, inductor, and two capacitors.
• Includes an inhibit function for power management control alongside continuous output voltage monitoring via a Power Good flag.
• Provides built-in short-circuit protection and thermal limiting to prevent damage during accidental faults.

Voltage Regulators - DC DC Switching Regulators Applications

• Low-voltage applications replacing high-current linear solutions where power dissipation causes heating
• Portable electronics requiring compact surface-mount designs due to high switching frequency
• Battery-powered devices utilizing the inhibit feature for extended standby life

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'PUR' corresponds to the required packaging format (cut tape or reel) as indicated in distributor listings. Confirm that the DFN6 package dimensions align with your PCB footprint requirements. Ensure the input voltage range of 2.7 V to 5.5 V meets your system's supply specifications before finalizing procurement.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact solution for low-output voltage regulation is needed. The 1.5 MHz frequency allows for smaller passive components compared to lower-frequency alternatives. Consider the inhibit function if system-level power gating is required. Verify that the 2 A current capability matches the load demands without exceeding thermal limits in the intended enclosure.

Voltage Regulators - DC DC Switching Regulators Part Context

The ST1S09IPUR belongs to the ST1S09 series of synchronous buck converters designed for efficiency and size reduction. This family is optimized for powering low-voltage digital circuits and peripherals. The 'I' variant typically denotes specific performance characteristics within the series, while 'PUR' indicates the tape-and-reel packaging configuration for automated assembly.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Evaluate other members of the ST1S09 family or similar synchronous buck converters from STMicroelectronics based on pin compatibility and electrical parameter overlap.