L6902D

Voltage Regulators - DC DC Switching Regulators Overview

The L6902D is a step-down switching regulator IC manufactured by STMicroelectronics, designed for high-efficiency DC-DC conversion. It features an adjustable output voltage range from 1.235V to 34V and supports a maximum output current of 1A. The device operates with an input voltage between 8V and 36V at a fixed internal switching frequency of 250kHz. It utilizes a voltage mode structure with integrated current error amplification for precise constant voltage and constant current control. The component is housed in an 8-SOIC surface-mount package and functions within a junction temperature range of -40°C to 150°C.

Voltage Regulators - DC DC Switching Regulators Feature Summary

• Integrates a robust P-channel DMOS power transistor with low on-resistance to ensure high efficiency and minimal dropout voltage under load.
• Provides accurate programmable current limiting via external sense resistors, enabling versatile applications such as battery charging.
• Includes comprehensive protection mechanisms including thermal shutdown, overvoltage protection, and feedback disconnection safety.

Voltage Regulators - DC DC Switching Regulators Applications

• Constant current battery charging for NiMH and NiCd cells
• Standard DC-DC converter modules with adjustable current limits
• Evaluation board implementations for compact power supply designs

Voltage Regulators - DC DC Switching Regulators Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm packaging type and tape/reel specifications. Ensure that any pin-compatible replacements maintain identical electrical characteristics and thermal performance ratings. Cross-reference the RoHS compliance status and environmental declarations with the latest datasheet revisions before finalizing procurement decisions.

Voltage Regulators - DC DC Switching Regulators Selection Notes

Select this component when designing systems requiring a simple buck topology with integrated current regulation capabilities. The fixed 250kHz frequency allows for the use of smaller passive components compared to lower-frequency alternatives. Consider the SO-8 package constraints for thermal management and board space limitations during the initial schematic capture phase.

Voltage Regulators - DC DC Switching Regulators Part Context

This part belongs to the L6902 series of switching regulators from STMicroelectronics. It is distinct from linear regulators and synchronous buck controllers due to its specific non-synchronous architecture and integrated power switch design. The series focuses on providing a cost-effective solution for medium-current applications where adjustable current limiting is a primary requirement.

Voltage Regulators - DC DC Switching Regulators Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify compatibility with alternative devices by matching input voltage ranges, output current capabilities, and package dimensions strictly through official manufacturer cross-reference lists.

Voltage Regulators - DC DC Switching Regulators FAQ

How is the current limit programmed on the L6902D?

The current limit is set using an external current sense resistor connected to the dedicated current sense pins, allowing for accurate programming with ±5% accuracy.

What protections are included in the L6902D?

The device includes thermal shutdown, overvoltage protection, frequency foldback overcurrent protection, and protection against feedback disconnection.