L7905CP

Overview

The L7905CP is a three-terminal negative linear voltage regulator from the L79xxC series, manufactured by STMicroelectronics. It provides a fixed output voltage of -5 V with an output current capability up to 1.5 A. The device accepts a DC input voltage ranging from -7 V to -35 V and operates within a junction temperature range of 0 °C to 150 °C. Key electrical characteristics include a typical quiescent current of 3 mA, line regulation of 100 mV (VI = -7 to -25 V), load regulation of 100 mV (IO = 5 mA to 1.5 A), and a dropout voltage of 1.4 V at 1 A. It features thermal overload protection, short-circuit protection, and output safe-area protection.

Feature Summary

• Integrated thermal overload protection prevents damage during excessive heat generation.
• Short circuit protection safeguards the device against output terminal faults.
• Output transition Safe Operating Area (SOA) protection ensures stability under varying load conditions.

Applications

• Local on-card voltage regulation for electronic circuits
• Split power supply systems requiring negative voltage rails
• Negative voltage regulation in general-purpose power management

Procurement Notes

Verify the specific ordering code suffix to confirm the package type, as the L7905CP designation corresponds to the TO-220FP variant. Confirm RoHS compliance status and environmental specifications via the manufacturer's official documentation before procurement. Ensure that the selected component matches the required thermal resistance and mounting style for the intended application design.

Selection Notes

Select this component when a fixed negative voltage rail is required for local regulation. The TO-220FP package facilitates efficient heat dissipation through flange mounting, supporting high current loads. Consider the input-to-output voltage differential to manage power dissipation and ensure adequate heat sinking is provided to maintain operation within the specified temperature limits.

Part Context

The L7905CP belongs to the L79xxC series of three-terminal negative regulators. This family offers various fixed output voltages (-5, -8, -12, -15 V) and is designed to complement the L78xx positive regulator series. The devices are available in multiple packages including TO-220, TO-220FP, and D²PAK, providing flexibility for different board layout and thermal management requirements.

Replacement Considerations

Compatible substitutes within the same series include L7905CV (TO-220 package) and L7905CD2T-TR (D²PAK package). Verify pinout compatibility and thermal performance characteristics when substituting to ensure equivalent functionality and reliability in the existing design.

FAQ

What is the maximum input voltage for the L7905CP?

The maximum DC input voltage for the L7905CP is -35 V.

Does the L7905CP include internal protection features?

Yes, it includes thermal overload protection, short-circuit protection, and output Safe Operating Area (SOA) protection.

What is the typical quiescent current of the L7905CP?

The typical quiescent current is 3 mA at a junction temperature of 25 °C.