L4947

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

The L4947 is a monolithic integrated circuit in a Pentawatt package designed as a very low drop regulator with a reset function. It provides a fixed 5V output at up to 500mA with a maximum dropout voltage of 0.75V over the full temperature range. The device features precise output voltage accuracy of ±4% and includes protection against load dump, reverse voltage, short circuits, and thermal shutdown. It operates with an input voltage range from 6V to 26V.

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

• Integrated reset function for microprocessor system supervision
• Very low dropout voltage capability for cranking phase operation
• Robust protection against automotive electrical transients
• Externally programmable power-on reset delay

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

• Automotive electronic systems
• Industrial electronic systems
• Microprocessor-based system power supplies

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

Verify component authenticity through authorized STMicroelectronics distributors or certified partners. Confirm the specific revision status and datasheet version prior to integration. Ensure compliance with RoHS3 specifications and check for any obsolescence notices. Validate that the Pentawatt package dimensions match the target PCB footprint requirements.

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

Select this component when a stable 5V supply is required for automotive or industrial environments. The low dropout characteristic ensures functionality during battery voltage dips. The integrated reset signal simplifies microprocessor initialization sequences. Verify that external compensation capacitors meet the minimum capacitance and ESR requirements for stability.

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

This device belongs to the L4947 family of linear regulators manufactured by STMicroelectronics. It is specifically engineered for harsh electrical environments found in vehicles and industrial machinery. The Pentawatt package facilitates efficient heat dissipation for continuous high-current operation.

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

The L4947R is a variant within the same family offering similar regulation characteristics but with different reset threshold parameters. Verify pin compatibility and reset timing requirements before substituting.