MIC29303BT L3

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

The MIC29303BT L3 is a high-current, low-dropout linear voltage regulator manufactured by Micrel. It provides a fixed 5 V output with a maximum load current of 3 A. The device utilizes a Super βeta PNP process to achieve a typical dropout voltage of 350 mV at full load and maintains very low ground current. It features an accuracy tolerance of ±1% and includes comprehensive protection against overcurrent, reverse polarity, and thermal overload. The component is housed in a TO-220 package suitable for through-hole mounting.

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

• High current capability delivering up to 3 A
• Low dropout voltage characteristic
• Integrated error flag signaling
• Reverse battery protection

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

• Battery-powered equipment
• Automotive electronics
• High-efficiency linear power supplies

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

Verify the specific suffix 'L3' against official Micrel documentation to confirm pinout or marking variations. Ensure the TO-220 package matches the target PCB footprint. Confirm RoHS compliance status as older Micrel batches may differ. Validate that the fixed 5 V output aligns with system requirements before procurement.

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

Select this regulator for applications requiring stable 5 V supply under heavy loads up to 3 A. Consider the TO-220 package for adequate thermal dissipation without external heatsinks in moderate environments. Verify input voltage remains within the 26 V maximum limit. Choose this part over adjustable versions when a fixed output eliminates external resistor networks.

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

This component belongs to the MIC29300 series of high-current low-dropout regulators. The series includes variants with different current ratings and output configurations. The MIC29303 specifically denotes the 3 A fixed 5 V version. These devices are designed for systems demanding high efficiency and fast transient response from linear regulation stages.

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

MIC29303WU (TO-263 surface mount equivalent)

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

What is the function of the error flag on the MIC29303BT?

The error flag signals whenever the output falls out of regulation due to conditions such as low input voltage, current limiting, or thermal shutdown.

Does the MIC29303BT support reverse battery protection?

Yes, the device includes protection against reverse-battery connection and load dump transients.