E-L6902D

Overview

The L6902D is a step-down switching regulator IC from STMicroelectronics, designed for applications requiring up to 1A output current. It operates with an input voltage range of 8V to 36V and provides an adjustable output voltage from 1.235V to 34V. The device features a fixed internal switching frequency of 250kHz and integrates a P-channel DMOS power transistor with a typical on-resistance of 250mΩ. It includes adjustable current limit functionality with ±5% accuracy, thermal shutdown protection at 150°C, overvoltage protection, and feedback disconnection protection. The component is housed in an 8-SOIC package.

Feature Summary

• Integrates a robust P-channel DMOS power stage for high efficiency and low dropout voltage.
• Features adjustable constant current control suitable for battery charging applications.
• Includes comprehensive protection mechanisms such as thermal shutdown and overcurrent latching.

Applications

• NiMH and NiCd battery charging systems
• Standard DC/DC converter designs with adjustable current limits
• Space-constrained compact power supply modules

Procurement Notes

Verify the specific ordering suffix to confirm packaging type, as the base part number may be available in tubes or tape-and-reel formats. Ensure that the selected variant matches the required input voltage range and output current specifications for the target application. Cross-reference the manufacturer's latest datasheet to confirm RoHS compliance and availability status before finalizing procurement plans.

Selection Notes

Select this component when a non-synchronous buck converter with integrated current limiting is required. The fixed 250kHz frequency allows for smaller external passive components compared to lower-frequency alternatives. Consider the thermal performance within the SO-8 package if operating near the maximum 1A current limit or high input voltages. Verify that the load requirements do not exceed the internal short-circuit protection threshold of 2.5A.

Part Context

The L6902D belongs to the L6902 series of switching regulators from STMicroelectronics. This series focuses on simple, complete step-down solutions with built-in current error amplifiers. It differs from synchronous rectifier counterparts by using a P-channel MOSFET, which simplifies the control loop but may result in slightly higher conduction losses at very high currents. The family is designed for cost-sensitive and space-efficient industrial and consumer applications.

Replacement Considerations

Public confirmed substitute part numbers are not identified in the provided documentation. Users should consult the official STMicroelectronics product selector for compatible alternatives based on specific electrical requirements and package constraints.