L4909

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

The L4909 is a monolithic multifunction voltage regulator manufactured by STMicroelectronics, designed for applications requiring multiple regulated outputs from a single component. It integrates three positive adjustable linear regulators (LDOs), each capable of delivering up to 1.2A of output current. The device operates with a minimum input voltage of 5V and supports a maximum input voltage of 40V. Each regulator channel features independent enable inputs and feedback pins, allowing for flexible configuration and power management control. The unit is housed in a 15-Multiwatt package suitable for through-hole mounting.

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

• Integrates three independently controllable positive adjustable linear regulators within a single monolithic package
• Provides high output current capability of 1.2A per regulator channel
• Features dedicated enable inputs for each regulator to facilitate precise power sequencing and energy saving
• Supports wide input voltage range up to 40V for robust operation in various supply conditions

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

• Portable equipment requiring multiple voltage rails
• Battery-powered systems needing efficient linear regulation
• General-purpose power management in embedded electronics

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

Verify the specific suffix codes on the ordering information to confirm pinout compatibility and thermal performance characteristics. Ensure that the selected variant matches the required lead frame finish and moisture sensitivity level for your assembly process. Cross-reference the manufacturer's latest datasheet to confirm active status, as this component may have been superseded or discontinued in certain regions.

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

Select this component when a design requires three distinct adjustable voltage outputs driven by a common input source. The 1.2A current rating per channel makes it suitable for powering moderate-load digital logic and analog circuits. Consider the thermal dissipation requirements of the 15-Multiwatt package under maximum load conditions to ensure reliable operation without external heatsinking if possible.

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

The L4909 belongs to STMicroelectronics' family of multifunction voltage regulators, which consolidate multiple power management functions into compact packages. This approach reduces printed circuit board area and simplifies bill of materials compared to using discrete regulators. It serves as a cost-effective solution for systems where space constraints and component count are critical design factors.

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

Check for direct pin-to-pin replacements within the same STMicroelectronics multifunction regulator series. Verify that alternative parts maintain the 1.2A current rating and 40V input voltage tolerance. Ensure that the replacement offers compatible enable logic and feedback configurations.