L7985A

Voltage Regulators - DC DC Switching Regulators Overview

The L7985A 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 accepts input voltages from 4.5 V to 38 V and supports adjustable output voltages starting from 0.6 V. The device includes an internal 250 kHz oscillator, externally programmable up to 1 MHz. Available in HSOP8 package with exposed pad, it achieves a thermal resistance (RthJA) down to 40 °C/W.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a 2.5 A current-limited embedded power MOSFET for high-efficiency step-down conversion
• Features an internal oscillator with switching frequency programmable from 250 kHz to 1 MHz
• Supports low dropout operation with 100% duty cycle and voltage feed-forward capability
• Includes internal soft-start, enable function, overcurrent protection, and thermal shutdown

Voltage Regulators - DC DC Switching Regulators Applications

• Automotive electronics systems requiring robust buck regulation
• Industrial applications demanding high reliability and wide input range
• USB Power Delivery sink configurations using STUSB4500 controllers
• General-purpose DC-DC conversion for embedded microcontroller systems

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific ordering suffix to confirm the exact package type, such as HSOP8 or VFDFPN, as these determine physical dimensions and thermal characteristics. Confirm RoHS compliance status and ensure the selected variant matches the required automotive qualification if applicable for the target application environment.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select the L7985A when a wide input voltage range up to 38 V and adjustable output down to 0.6 V are required. Choose this component for designs needing flexible switching frequency adjustment to optimize EMI or transient response. Consider the HSOP8 package for superior thermal performance compared to standard SOIC packages.

Voltage Regulators - DC DC Switching Regulators Part Context

The L7985A belongs to STMicroelectronics' portfolio of monolithic buck converters and step-down switching regulators. This family targets automotive and industrial sectors, emphasizing high reliability and performance. It complements other ST power management solutions by providing efficient voltage regulation for complex system architectures.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

The A7985A is a confirmed automotive-grade qualified substitute within the same functional family. Both devices share identical electrical specifications, pinout compatibility, and feature sets, allowing for direct replacement in designs requiring AEC-Q100 certification.