L6997S

DC DC Switching Controllers Overview

The L6997S is a synchronous buck DC-DC switching controller from STMicroelectronics, designed for high-efficiency power conversion in networking and mobile applications. It operates with a Vcc/Vdd supply range of 3V to 5.5V and supports an input voltage range of 1V to 35V. The device features a constant on-time topology for fast load transient response and includes embedded voltage feed-forward for nearly constant switching frequency across wide input ranges. It offers a minimum output voltage as low as 0.6V with a typical reference accuracy of ±1%. Key control characteristics include current limit, enable, phase control, power good signal, and soft start functionality.

DC DC Switching Controllers Feature Summary

• Constant on-time topology ensures rapid load transient response
• Embedded voltage feed-forward maintains stable switching frequency over wide input variations
• Remote sensing capability improves static and dynamic regulation by compensating for wire voltage drops
• Pulse skipping technique reduces power consumption during light load conditions

DC DC Switching Controllers Applications

• Networking DC/DC modules
• Mobile application power supplies
• Systems compatible with 3.3V bus standards
• Systems compatible with 5V bus standards

DC DC Switching Controllers Procurement Notes

Verify component status carefully as the L6997S is listed as discontinued. Confirm availability through authorized distributors or secondary market sources if immediate procurement is required. Ensure that any substitute components meet the original electrical specifications and pinout compatibility. Check RoHS compliance and MSL ratings for storage and handling requirements prior to integration into production lines.

DC DC Switching Controllers Selection Notes

Select this controller for applications requiring high efficiency and fast transient response under varying input voltages. The synchronous rectifier design supports output currents exceeding 20A. Consider the remote sensing feature if long PCB traces introduce significant voltage drop. The device is suitable for designs needing precise low-voltage regulation down to 0.6V with minimal static error due to the integrator in the control loop.

DC DC Switching Controllers Part Context

The L6997S belongs to STMicroelectronics' portfolio of power management ICs focused on DC-DC conversion. It is part of the L6997 family, which includes variants like the L6997STR and L6997SDKR. These devices are engineered for compact, high-performance power solutions in consumer and industrial electronics, leveraging ST's expertise in efficient switching regulator technologies.

DC DC Switching Controllers Replacement Considerations

Public confirmed substitute part numbers include L6997STR and L6997SDKR. Verify pin-to-pin compatibility and electrical parameter alignment before substitution. Note that the base part number L6997S may have different suffixes indicating packaging or tape/reel configurations.