MIC5255-2.85BD5-TR

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

The MIC5255-2.85BD5-TR is a 150mA low-noise CMOS LDO from Micrel, providing a fixed 2.85V output with 1% initial accuracy and 2% over temperature stability. It operates within a 2.7V to 6.0V input range, featuring an ultra-low dropout voltage of 135mV at full load and typical quiescent current of 90µA. The device includes a noise bypass pin for further noise reduction, TTL-compatible enable control, and thermal shutdown protection. Packaged in a 5-pin Thin SOT-23 (TSOT-23) format, it ensures stability with low-ESR ceramic capacitors.

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

• Ultra-low output noise performance suitable for RF applications
• TTL-logic-compatible enable pin for zero off-mode current
• Stable operation with low-ESR ceramic output 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 specific package type matches the design requirements, as the MIC5255 series is available in multiple packages including SOT-23, TSOT-23, and MLF. Confirm that the ordering suffix corresponds to the correct voltage and package variant. Ensure compatibility with low-ESR ceramic capacitors for optimal stability. Check datasheet specifications for thermal resistance values relevant to your PCB layout to ensure proper heat dissipation under maximum load conditions.

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

Select this component when ultra-low noise is critical for sensitive analog or RF circuits. The 2.85V output is fixed; verify it meets system voltage requirements. Consider the Thin SOT-23 package for space-constrained designs. Ensure input voltage remains above the minimum operating threshold plus dropout voltage. Evaluate thermal performance based on expected power dissipation and ambient temperature constraints.

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

This part belongs to the MIC5255 family of low-dropout regulators designed for handheld and battery-powered devices. The 'BD5' suffix indicates the 5-pin Thin SOT-23 package variant. The '-TR' suffix typically denotes tape-and-reel packaging for automated assembly. The device is manufactured by Micrel, which has since been acquired by Microchip Technology.

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

Other MIC5255 variants with different output voltages or packages may serve as functional replacements if electrical parameters align. Verify pinout compatibility, especially between SOT-23 and TSOT-23 packages, as they share similar footprints but may have slight dimensional differences. Ensure any substitute maintains the required noise performance and current capacity.