L7981A

Voltage Regulators - DC DC Switching Regulators Overview

The L7981A is a step-down switching regulator from STMicroelectronics featuring an embedded Power MOSFET with a 3.7 A minimum current limit, delivering up to 3 A DC output current. It accepts an input voltage range of 4.5 V to 28 V and provides an adjustable output voltage from 0.6 V to VIN. The device integrates an internal 250 kHz oscillator that can be externally adjusted up to 1 MHz. Available in VFQFPN 3x3-8L and HSOP8 packages, it supports low dropout operation at 100% duty cycle, includes internal soft-start and enable functions, and offers overcurrent and thermal protection.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates an embedded power MOSFET for compact design
• Supports low dropout operation with 100% duty cycle
• Includes internal soft-start and programmable enable functionality
• Features voltage feed-forward and zero load current operation

Voltage Regulators - DC DC Switching Regulators Applications

• Industrial point-of-load regulation
• Automotive power distribution systems
• Consumer electronics power management
• General-purpose DC-DC conversion

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific package variant (VFQFPN or HSOP8) required for your thermal and footprint constraints. Confirm the suffix designation matches the exact electrical characteristics needed. Check for availability status as product lifecycles may change. Ensure compatibility with your PCB layout regarding the exposed pad thermal requirements. Review the latest datasheet for any updates on recommended operating conditions.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a monolithic buck converter with high efficiency and minimal external components is required. Consider the L7981A for applications needing input voltages up to 28 V and output currents around 3 A. Evaluate the thermal performance based on the chosen package type. Use the programmable frequency feature to optimize for size or noise requirements. Ensure the design accommodates the 0.6 V minimum output voltage capability.

Voltage Regulators - DC DC Switching Regulators Part Context

The L7981A belongs to STMicroelectronics' portfolio of monolithic DC-DC switching regulators designed for high reliability. These devices are engineered for industrial and automotive markets, offering robust protection features. The family emphasizes compactness and high thermal performance through various package options. This specific model targets applications requiring efficient step-down conversion with integrated power switches.

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 by comparing pinouts, electrical parameters, and thermal characteristics before substitution.