L4947PD

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The L4947PD is a monolithic integrated circuit in PowerSO20 package designed as a very low drop regulator providing a stabilized 5V output at up to 500mA. It features precise output voltage tolerance of ±4% over the full temperature range of –40°C to 125°C. The device incorporates a reset function with power-on delay defined by an external capacitor, along with protection against +80V and -80V load dump, reverse voltage, short circuit, and thermal shutdown.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Very low dropout voltage capability for stable operation during automotive cranking phases
• Integrated reset function with externally programmable delay for microprocessor system supervision
• Robust protection circuits including high-voltage load dump, reverse voltage, and thermal shutdown

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• Automotive electronic systems requiring supply stability during battery voltage fluctuations
• Industrial electronic systems needing reliable voltage regulation
• Microprocessor-based systems requiring power-on reset signals

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify component authenticity through authorized STMicroelectronics distributors or certified partners. Confirm package integrity and pin alignment upon receipt. Check datasheet revisions for any updates to electrical characteristics or ordering information. Ensure compliance with RoHS directives if required for your specific application environment.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a fixed 5V output with high current capability and integrated reset functionality is required. Consider the PowerSO20 package for applications needing robust thermal dissipation and space efficiency. Evaluate the need for external compensation capacitors to ensure loop stability under varying load conditions.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This part belongs to the L4947 family of low-dropout regulators from STMicroelectronics. It is specifically engineered for demanding environments where voltage stability and system protection are critical. The inclusion of a reset generator distinguishes it from standard LDOs, making it suitable for complex digital logic control.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

L4947PD is listed as obsolete. Verify availability of direct replacements or compatible alternatives with matching electrical specifications and pin configurations before design finalization.