L6981C33DR

Voltage Regulators - DC DC Switching Regulators Overview

The L6981C33DR is a synchronous step-down switching regulator manufactured by STMicroelectronics, designed for industrial power systems. It operates within an input voltage range of 3.5 V to 38 V and delivers a fixed output voltage of 3.3 V at up to 1.5 A DC. The device features a low quiescent current of 20 uA and a shutdown current of 2 μA. It utilizes peak current mode architecture with internal compensation in an SO-8 package. The operating temperature range spans from -40 °C to +150 °C, with a typical switching frequency of 400 kHz.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Synchronous buck topology with integrated high-side and low-side power elements
• Low consumption mode optimized for high efficiency at light loads
• Internal compensation network minimizes external component count
• Comprehensive protection including thermal shutdown and overcurrent limiting

Voltage Regulators - DC DC Switching Regulators Applications

• Industrial power supply systems
• Battery-powered equipment requiring high light-load efficiency
• Noise-sensitive applications utilizing low noise mode variants
• Point-of-load regulation in compact form factors

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix against official datasheets to confirm operational modes, as variations exist between Low Consumption Mode (LCM) and Low Noise Mode (LNM). Ensure the SO-8 package type matches design constraints. Confirm RoHS compliance status through manufacturer documentation prior to integration.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component for designs requiring wide input voltage tolerance up to 38 V with moderate output current. The internal compensation simplifies layout compared to externally compensated alternatives. Consider the specific C33 suffix for fixed 3.3 V output requirements. Evaluate thermal performance based on ambient conditions and PCB copper area.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the L6981 series of monolithic step-down regulators. The series includes variants optimized for different performance characteristics, such as low consumption or low noise operation. It is categorized under PMIC switching voltage regulators within the STMicroelectronics portfolio.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include other L6981 series variants with compatible pinouts but different output voltages or optimization modes. Verify electrical parameters and package dimensions before substitution.