L6986FTR

Voltage Regulators - DC DC Switching Regulators Overview

The L6986FTR is a synchronous step-down switching regulator from STMicroelectronics, designed to deliver up to 1.5 A DC output current. It operates with an input voltage range of 4 V to 38 V, supporting standard 5 V, 12 V, and 24 V power supplies. The device features adjustable output voltage from 0.85 V to VIN and includes Low Consumption Mode (LCM) for light-load efficiency and Low Noise Mode (LNM) for constant frequency operation. Key specifications include a quiescent current of 30 µA in LCM, adjustable switching frequency between 250 kHz and 2 MHz, and integrated protections such as thermal shutdown, overvoltage protection, and internal current limiting.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Features P-channel MOSFET high-side switch enabling 100% duty cycle operation for low dropout performance.
• Includes Low Consumption Mode (LCM) to maximize efficiency at light loads with controlled ripple.
• Offers Low Noise Mode (LNM) for constant switching frequency and minimized output voltage ripple.
• Integrates an embedded output voltage supervisor with RST open-collector output for sequencing.

Voltage Regulators - DC DC Switching Regulators Applications

• Powering digital loads such as microcontrollers (μC) and FPGAs
• 5 V, 12 V, and 24 V industrial power supply systems
• Battery-powered applications requiring efficient idle mode operation

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific suffix 'F' indicates the 1.5 A current rating variant distinct from the standard 2 A L6986 or isolated L6986I models. Confirm HTSSOP-16 packaging requirements and RoHS compliance status with the supplier. Ensure design compatibility with the specified 4 V to 38 V input range and check for any specific ordering codes related to tape and reel quantities.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when a compact solution is required for medium-load applications up to 1.5 A. It is suitable for designs needing flexible switching frequency adjustment to optimize EMI or component size. Consider the L6986FTR if low noise or ultra-low quiescent current modes are critical for system stability and battery life extension.

Voltage Regulators - DC DC Switching Regulators Part Context

The L6986F is part of STMicroelectronics' L6986 family of synchronous buck regulators. While the base L6986 supports 2 A, the L6986F variant is specifically rated for 1.5 A DC output. This family shares common architectural features like peak current mode control and extensive protection mechanisms, offering designers a scalable option within the same package and pinout configuration.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Direct substitutes include the L6986 (2 A version) if higher current capacity is acceptable, or the L5986 (2.5 A, 18 V max input) for lower voltage applications. For isolated topologies, the L6986I is the appropriate alternative. Verify pin compatibility and thermal performance when swapping variants.

Voltage Regulators - DC DC Switching Regulators FAQ

What is the difference between Low Consumption Mode and Low Noise Mode?

Low Consumption Mode (LCM) optimizes efficiency at light loads by varying the switching frequency, while Low Noise Mode (LNM) maintains a constant switching frequency to minimize output voltage ripple and electromagnetic interference.

How does the device handle short-circuit conditions?

The L6986F implements pulse-by-pulse current sensing on both power elements to provide effective constant current protection, preventing damage during overload or short-circuit events.