ST1S40IPHR

Voltage Regulators - DC DC Switching Regulators Overview

The ST1S40IPHR is a synchronous step-down switching regulator from STMicroelectronics, operating with an input voltage range of 4.0 V to 18 V. It delivers a continuous output current of 3 A at a fixed switching frequency of 850 kHz. The device features an adjustable output voltage starting from 0.8 V and utilizes peak current mode control with internal compensation. Packaged in an 8-lead HSOP (HSOP-8) surface-mount format, it integrates high-side and synchronous rectifier MOSFETs for high efficiency.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates internally compensated peak current mode control architecture for stable regulation with minimal external component count.
• Features integrated power MOSFETs including a 95 mΩ high-side switch and a 69 mΩ synchronous rectifier to ensure high efficiency across load ranges.
• Includes comprehensive protection mechanisms such as cycle-by-cycle current limiting, current fold-back short-circuit protection, and internal soft-start functionality.

Voltage Regulators - DC DC Switching Regulators Applications

• Industrial equipment power distribution systems
• Automotive body electronics and convenience modules
• Portable battery-powered devices requiring efficient DC-DC conversion

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific package variant against design requirements, as the ST1S40 series includes VFQFPN and SO-8 options alongside the HSOP-8 used in this part number. Confirm that the 850 kHz fixed frequency aligns with electromagnetic interference constraints in the target application. Ensure compatibility with all-ceramic capacitor designs if specified in the system schematic.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact solution with high efficiency is required for inputs up to 18 V. The HSOP-8 package offers a balance between thermal performance and board space compared to larger packages. Consider the internal compensation feature if minimizing passive component count is a priority over customizable loop response characteristics found in externally compensated regulators.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the ST1S40 family of monolithic buck converters designed for automotive and industrial applications. The family shares core topology and control logic but varies in packaging and thermal characteristics. The IP suffix typically denotes the specific HSOP-8 package configuration within the broader product line.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct pin-compatible alternatives within the same family include ST1S40IDR (SO-8 package). Cross-family replacements require verification of pinout compatibility and electrical parameter alignment, particularly regarding output current capability and switching frequency.