L7985

Voltage Regulators - DC DC Switching Regulators Overview

The L7985 is a step-down switching regulator featuring an embedded power MOSFET with a minimum current limit of 2.5 A, delivering up to 2 A DC output current. It supports an input voltage range from 4.5 V to 38 V and provides an adjustable output voltage starting from 0.6 V. The device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz. Available in VFDFPN 3x3-10L and HSOP8 packages with exposed pads, it offers thermal resistance (RthJA) down to 60 °C/W and 40 °C/W respectively.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates an internal 250 kHz switching frequency oscillator with external programmability up to 1 MHz
• Features low dropout operation allowing 100% duty cycle for minimal voltage drop
• Includes internal soft-start and enable functions for controlled startup sequences
• Provides comprehensive protection against overcurrent conditions and excessive thermal stress

Voltage Regulators - DC DC Switching Regulators Applications

• Automotive digital instrument clusters
• Industrial automation control systems
• General-purpose DC/DC conversion in power trees

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific package variant required, as the L7985 family includes both VFDFPN 3x3-10L and HSOP8 options. Confirm the exact suffix indicates the correct packaging format such as tape and reel or cut tape. Ensure compatibility with the target PCB footprint and thermal pad requirements specified in the datasheet for the selected package type before finalizing procurement orders.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when an input voltage up to 38 V is required, distinguishing it from lower-voltage variants like the L7980 or L7981 which are limited to 28 V. Choose based on the necessary thermal management capabilities, noting the different RthJA values between the DFN and HSOP packages. Consider the need for high-frequency operation up to 1 MHz if minimizing external passive component size is a priority.

Voltage Regulators - DC DC Switching Regulators Part Context

The L7985 belongs to STMicroelectronics' monolithic buck converter portfolio designed for automotive and industrial applications. It shares architectural similarities with the L7980 and L7981 but is distinguished by its higher maximum input voltage rating of 38 V compared to the 28 V limit of its peers. This places it within the same active product line of step-down switching regulators offering integrated power MOSFETs.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.