MCP1812AT-033/LB

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

The MCP1812AT-033/LB is a fixed-output Low Dropout (LDO) linear regulator from the MCP1812A family, manufactured by Microchip Technology. It provides a nominal output voltage of 3.3 V with a maximum continuous output current capability of 300 mA. The device operates within an input voltage range of 1.8 V to 5.5 V and maintains an ultra-low typical quiescent current of 250 nA during normal operation. It features overcurrent protection and includes an internal output discharge switch for rapid shutdown when the SHDN pin is grounded. The component is housed in a 5-Lead SOT-23 package and is rated for steady-state junction temperatures between -40°C and +85°C.

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

• Ultra-low quiescent current consumption designed for extended battery life in portable applications
• Integrated output discharge mechanism that rapidly bleeds charge from the output capacitor upon shutdown
• Stable operation with small ceramic output capacitors, reducing overall solution size and cost
• Built-in overcurrent protection to safeguard the regulator and load during fault conditions

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

• Energy harvesting systems requiring minimal standby power drain
• Long-life battery-powered devices such as wearable electronics and smart cards
• Medical devices including hearing aids where low noise and high reliability are critical

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

Verify the specific suffix 'LB' against official Microchip documentation to confirm package and temperature grade alignment. Confirm availability status as distribution channels may list discontinued or obsolete inventory. Ensure the ordering part number matches the exact electrical specifications required for the design.

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

Select this component when a 3.3 V rail is needed with up to 300 mA load current while maintaining ultra-low static power consumption. Ensure the input voltage remains above the dropout threshold plus the minimum operating voltage. Verify that the application benefits from the integrated output discharge feature for fast system sleep transitions.

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

This device belongs to the MCP1811A/11B/12A/12B family of ultra-low quiescent current LDO regulators. The '12' designation indicates the 300 mA output current class, distinguishing it from the 150 mA MCP1811X series. The 'A' suffix denotes the inclusion of the output discharge function, which differentiates it from the 'B' variant that lacks this feature.

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

MCP1812AT-033/OT

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

Does the MCP1812AT-033/LB include an output discharge function?

Yes, the 'A' designation in the part number indicates that the device includes an internal output discharge switch that activates when the SHDN pin is pulled low.

What is the minimum output capacitance required for stability?

The device requires a minimum output capacitance of 2.2 µF to ensure stability, particularly when using ceramic capacitors.