MIC5156-3.3BN

Overview

The MIC5156-3.3BN is a Super LDO Regulator Controller manufactured by Microchip Technology, designed for high-current low-dropout linear voltage regulation applications. It features a fixed 3.3V output voltage and operates within an input voltage range of 3V to 36V. The device draws a supply current of 2.7mA and supports operation across a temperature range of -40°C to +85°C. Housed in an 8-DIP package with a width of 0.300 inches (7.62mm), it provides a single regulated output. This component is part of the MIC5156 series, which integrates control logic to manage external pass transistors for efficient power management.

Feature Summary

• Integrates control logic for high-current low-dropout linear voltage regulation using external pass elements
• Provides a fixed 3.3V output voltage with wide input voltage tolerance up to 36V
• Features low supply current consumption of 2.7mA for efficient standby operation
• Designed for robust performance across industrial temperature ranges from -40°C to +85°C

Applications

• High-current low-dropout linear voltage regulation systems
• Power distribution management in electronic circuits
• Industrial equipment requiring stable 3.3V power rails
• Embedded systems utilizing external pass transistor configurations

Procurement Notes

Verify component authenticity as the MIC5156-3.3BN is listed as obsolete and no longer manufactured by Microchip Technology. Confirm availability through authorized distributors or surplus suppliers, ensuring documentation matches the original Micrel/Microchip specifications. Check for alternative active components within the MIC5156 series if long-term supply stability is required for production environments.

Selection Notes

Select this controller when a fixed 3.3V output is required without external feedback resistors. It is suitable for designs needing high current capability via external pass transistors rather than integrated solutions. Consider the 8-DIP package for through-hole mounting requirements. Evaluate thermal management needs based on the external pass element selection, as the controller itself does not handle the full load current internally.

Part Context

The MIC5156-3.3BN belongs to the MIC5156/5157/5158 Super LDO Regulator Controller family originally developed by Micrel, Inc., now part of Microchip Technology. These controllers are designed to simplify high-current linear regulation by offloading power handling to external MOSFETs or BJTs. The -3.3 suffix indicates a fixed output voltage variant, distinguishing it from adjustable versions like the MIC5156YN or MIC5156YM.

Replacement Considerations

The MIC5156-3.3BN is obsolete. Potential substitutes include other fixed-output Super LDO controllers from the same family if available, or modern equivalents from Microchip offering similar pinouts and electrical characteristics. Verify that replacement parts support the required 36V input rating and 2.7mA supply current.