MIC5253-1.8BC5-TR

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

The MIC5253-1.8BC5-TR is a fixed-output low-dropout linear regulator manufactured by Micrel, providing a stable 1.8V output with an initial accuracy of ±1.5%. It supports a continuous output current of 100mA and a peak current of 150mA within an input voltage range of 2.7V to 5.5V. The device features ultra-low noise performance at 30 µV(rms) and ultralow dropout voltage of 165mV at full load. It operates over a junction temperature range of –40°C to +125°C and includes TTL-compatible enable control, thermal shutdown, and current limit protection.

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

• Ultra-low noise output suitable for RF applications
• TTL-logic-controlled enable pin for zero off-mode current
• Stability with low-ESR ceramic capacitors
• Integrated thermal shutdown and current limit protection

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

• Cellular phones and pagers
• Battery-powered equipment
• Laptop, notebook, and palmtop computers
• Consumer and personal electronics

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

Verify the manufacturer origin as this component was originally produced by Micrel before acquisition by Microchip Technology. Confirm that the specific ordering suffix BC5 corresponds to the SC-70-5 package and standard marking requirements. Ensure compliance with RoHS directives if applicable to your supply chain standards. Validate the datasheet revision date against your design specifications to ensure all electrical characteristics align with your project requirements.

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

Select this regulator when ultra-low noise is critical for sensitive analog or RF circuits. The fixed 1.8V output eliminates the need for external resistors, simplifying board layout. Its compatibility with small ceramic capacitors reduces overall footprint, making it ideal for space-constrained handheld devices. Ensure the input voltage remains above 2.7V and consider the thermal resistance of the SC-70-5 package for high-load applications.

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

This component belongs to the MIC5253 series of 100mA Low Noise µCap Teeny LDO regulators. The series is designed for handheld and battery-powered devices requiring clean power supplies. The 'BC5' suffix indicates the SC-70-5 package type, while the '-1.8' specifies the fixed 1.8V output voltage. The '-TR' suffix typically denotes tape and reel packaging for automated assembly.

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

MIC5253-1.8YC5

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

Can the enable pin be left floating?

No, the enable pin cannot be left open or floating. It must be driven high to enable the regulator or low to shut it down, as a floating pin may cause an indeterminate state on the output.

What is the recommended capacitor for the bypass pin?

A 0.01µF capacitor is recommended from the bypass pin to ground to reduce output voltage noise. Larger values can further reduce noise but may slightly increase turn-on time.

Is the MIC5253 stable without a load?

Yes, the MIC5253 remains stable and in regulation with no load, which is beneficial for applications like CMOS RAM keep-alive where the load may vary significantly.