MCP1802T-3302I/OT

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

The MCP1802T-3302I/OT is a fixed-output low dropout (LDO) voltage regulator manufactured by Microchip Technology. It provides a nominal output voltage of 3.3V with a maximum continuous output current of 300 mA. The device operates within an input voltage range of 2.0V to 10.0V and features a typical quiescent current of 25 µA, reducing to 0.01 µA in shutdown mode. Output voltage accuracy is specified at ±2% for voltages greater than 1.5V. The regulator includes a shutdown pin, overcurrent protection with foldback, and high power supply ripple rejection (PSRR) of 70 dB typical at 10 kHz. It is housed in a SOT-23-5 package and supports operation from -40°C to +85°C.

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

• Low Dropout Voltage: Delivers stable regulation with minimal input-to-output differential, typically 200 mV at 100 mA load.
• High PSRR: Provides excellent noise suppression with a typical power supply ripple rejection ratio of 70 dB at 10 kHz.
• Shutdown Control: Features a dedicated SHDN pin that enables the device to enter a low-power state with typical current consumption of 0.01 µA when disabled.
• Current Limit Protection: Incorporates internal circuitry that monitors load current and activates foldback protection during short-circuit or overload conditions.

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

• Battery-powered devices
• Microcontroller power supplies
• Wireless communications equipment
• Smart battery packs

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

Verify component authenticity through authorized Microchip distributors or direct channels. Confirm the datasheet revision matches DS22053C. Ensure the ordering suffix corresponds to the required tape-and-reel packaging format. Check for RoHS compliance status as indicated in official documentation. Validate that the specific batch meets storage temperature requirements prior to assembly.

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

Select this component for applications requiring a fixed 3.3V rail with moderate current demands up to 300 mA. Consider the SOT-23-5 package constraints regarding thermal dissipation and physical space. Evaluate the input voltage range against the source supply to ensure adequate headroom for the dropout voltage. Verify that the external capacitor selection meets the minimum capacitance requirement for stability.

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

This part belongs to the MCP1802 family of CMOS low dropout linear regulators designed for battery-powered systems. The family offers various fixed output voltage options including 0.9V, 1.8V, 2.5V, 3.0V, 3.3V, 5.0V, and 6.0V. All variants share similar electrical characteristics such as low quiescent current and high PSRR, differing primarily in their regulated output voltage levels and specific marking codes.

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

Direct pin-compatible replacements within the same family include MCP1802T-1802I/OT (1.8V), MCP1802T-2502I/OT (2.5V), MCP1802T-3002I/OT (3.0V), MCP1802T-5002I/OT (5.0V), and MCP1802T-6002I/OT (6.0V). Cross-family upgrades may require schematic modifications due to differences in pinout or electrical specifications.

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

What is the minimum output capacitance required for stability?

The MCP1802 requires a minimum output capacitance of 1 µF for small signal stability. Ceramic capacitors with X7R or X5R dielectrics are recommended.

How does the shutdown pin function?

The SHDN pin controls the enable state of the regulator. A logic-high level enables the output, while a logic-low level disables it, reducing quiescent current to approximately 0.01 µA. The pin lacks internal pull-up or pull-down resistors.

What is the typical dropout voltage at 100 mA load?

The typical dropout voltage is 200 mV when the load current is 100 mA. Maximum dropout voltage can reach 250 mV under the same conditions.