L5970AD

Voltage Regulators - DC DC Switching Regulators Overview

The L5970AD is a monolithic step-down switching regulator manufactured by STMicroelectronics, designed for high-efficiency DC-DC conversion. It features an internal P-Channel D-MOS transistor with a typical on-resistance of 200mΩ, eliminating the need for bootstrap capacitors. The device supports an input voltage range from 4.4V to 36V and provides an adjustable output voltage between 1.235V and 35V. It delivers up to 1.5A of output current with a fixed internal switching frequency of 500kHz. The IC includes comprehensive protection mechanisms such as thermal shutdown, pulse-by-pulse current limiting, and feedback disconnection protection.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates an internal P-Channel D-MOS switching element to ensure high efficiency without requiring external bootstrap components
• Provides effective short-circuit protection through pulse-by-pulse current limiting combined with internal frequency modulation
• Supports zero load current operation and low dropout performance via 100% duty cycle capability
• Includes inhibitor functionality to achieve zero current consumption when disabled

Voltage Regulators - DC DC Switching Regulators Applications

• Computer-related applications utilizing 5V bus architectures
• General-purpose step-down power supply designs
• Embedded systems requiring adjustable voltage regulation from 1.235V to 35V

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'AD' corresponds to the required operating temperature range and package variant. Confirm that the 8-SOIC package dimensions align with PCB layout constraints. Ensure compatibility with the 500kHz switching frequency regarding external inductor and capacitor selection. Check RoHS compliance status if environmental regulations apply to the final assembly.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a non-synchronous buck converter is sufficient for loads up to 1.5A. The internal P-Channel MOSFET simplifies gate drive requirements compared to N-Channel alternatives. Consider the 500kHz frequency for balancing component size against electromagnetic interference. Verify that the minimum input voltage of 4.4V meets the system's lowest operating condition.

Voltage Regulators - DC DC Switching Regulators Part Context

The L5970AD belongs to the L5970 series of monolithic step-down switching regulators. It shares architectural similarities with the L5972D and L5973D but differs primarily in switch current limits and switching frequencies. Unlike automotive-grade variants such as the A5973AD, this part is optimized for general industrial and commercial applications rather than strict AEC-Q100 qualification.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The L5972D offers a higher current capacity of 2A but operates at a lower 250kHz frequency. The L5973AD provides similar electrical characteristics but utilizes an HSOP-8 package instead of SOIC-8. Direct pin-to-pin substitution requires verification of thermal performance and package footprint compatibility.