L5989DTR

Voltage Regulators - DC DC Switching Regulators Overview

The L5989DTR is a monolithic step-down switching regulator from STMicroelectronics, packaged in a 16-lead HTSSOP. It delivers a continuous output current of 4 A and can handle pulsed currents exceeding 5 A depending on thermal conditions. The device operates with an input voltage range of 2.9 V to 18 V and provides an adjustable output voltage between 600 mV and 18 V. The internal switching frequency is programmable via an external resistor, spanning from 100 kHz to 1 MHz. It features synchronous rectification and supports 100% duty cycle operation without requiring an external bootstrap capacitor.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Synchronous buck topology with integrated high-side PMOS switch enabling 100% duty cycle operation
• Multifunction UOS pin for configurable under-voltage lockout thresholds and overvoltage protection modes
• Dual-switch current sensing for precise limit protection and hiccup mode activation during faults
• Soft-start phase with constant current capability to support pre-biased output voltages

Voltage Regulators - DC DC Switching Regulators Applications

• Point-of-load regulation for industrial systems
• Power supply stages for embedded controllers
• Battery-powered equipment requiring efficient step-down conversion

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify component authenticity through authorized channels as the L5989DTR is listed as obsolete by the manufacturer. Confirm package integrity and pin alignment upon receipt. Review the official datasheet for specific handling instructions regarding the HTSSOP-16 package. Ensure design compatibility with legacy system requirements before finalizing procurement decisions.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a robust 4 A synchronous buck solution is required with flexible protection configurations. The adjustable switching frequency allows optimization for efficiency or component size. The multifunction pin offers design flexibility for UVLO and OVP settings. Consider thermal management capabilities due to the high current delivery potential within the HTSSOP-16 package constraints.

Voltage Regulators - DC DC Switching Regulators Part Context

The L5989D belongs to STMicroelectronics' family of high-current step-down regulators designed for demanding applications. It shares architectural similarities with other devices in the series but is distinguished by its specific current ratings and protection features. The TR suffix indicates tape and reel packaging suitable for automated surface-mount assembly processes.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing designs if considering alternative components.