Microchip Technology MIC5305-4.75YML-TR

Overview

MIC5305-4.75YML-TR from Micrel is a fixed-output 4.75V, 150mA ultra-low-dropout linear regulator in a 6-pin 2mm × 2mm MLF® package, featuring 60mV dropout at full load, ±1.0% initial output accuracy, and 20µV_rms output noise - optimized for low-power portable audio codec and fiber optic module power supplies.

For engineers reviewing the MIC5305-4.75YML-TR datasheet, MIC5305-4.75YML-TR pinout, MIC5305-4.75YML-TR application, or MIC5305-4.75YML-TR equivalent, key selection criteria include dropout voltage under 100mV at 150mA, logic-compatible enable input with sub-1µA shutdown current, ceramic capacitor stability (1µF output + 0.1µF bypass), and thermal performance in compact MLF packaging.

Technical Context

The MIC5305-4.75YML-TR integrates a CMOS-based LDO core with quick-start reference bypass circuitry and internal thermal shutdown. Its error amplifier drives a low-R_DS(on) pass transistor to achieve 60mV dropout at 150mA while maintaining ±1.0% output accuracy across line, load, and temperature.

It employs a dedicated BYP pin for external 0.1µF capacitor connection to reduce reference noise, enabling 20µV_rms output noise and up to 85dB PSRR at 1kHz. The active-high EN pin controls zero-current shutdown mode with <0.5µA quiescent draw when disabled.

Key Specifications

Pinout & Package

Package: 6-pin 2mm × 2mm MLF® (leadless, exposed thermal pad grounded internally).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MCP1700T-4702E/TT and TCS2117-4750CV, the MIC5305-4.75YML-TR uniquely combines ultra-low dropout (60mV), sub-1µA shutdown, and integrated BYP noise reduction - making it optimal for space-constrained, battery-sensitive designs requiring both precision and controllability.

Availability

MIC5305-4.75YML-TR is available at Aetrix Electronics and suitable for portable medical sensors, fiber optic transceivers, audio codec power supplies, and industrial edge controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MIC5305-4.75YML-TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Micrel Inc. was a U.S.-based semiconductor company specializing in high-performance analog and mixed-signal ICs, acquired by Microchip Technology in 2015. It pioneered µCap LDO architecture for ultra-compact, low-noise power management.

The MIC5305 family was designed specifically for battery-operated portable electronics requiring ultra-low dropout, ceramic-capacitor stability, and nanoscale footprint - targeting cellular handsets, PDAs, and optical modules before the smartphone era.

FAQ

What is the minimum input voltage required for MIC5305-4.75YML-TR to regulate at full 150mA load?

The MIC5305-4.75YML-TR requires VIN ≥ VOUT + dropout voltage. With 60mV typical dropout at 150mA, the minimum input is 4.75V + 0.06V = 4.81V. At worst-case 85mV dropout (per datasheet), VIN must be ≥ 4.835V to guarantee regulation under all conditions.

Does MIC5305-4.75YML-TR require an external bypass capacitor on the BYP pin?

No, the BYP pin may be left open, but using a 0.1µF ceramic capacitor to GND reduces output noise from 20µV_rms to <10µV_rms and improves PSRR by up to 20dB at 1kHz. MIC5305-4.75YML-TR remains fully functional without it.

Can MIC5305-4.75YML-TR operate without any load connected to VOUT?

Yes. Unlike many LDOs, MIC5305-4.75YML-TR is explicitly characterized for no-load stability and maintains regulation with zero output current - essential for CMOS RAM keep-alive and RTC backup applications.

What is the thermal performance of MIC5305-4.75YML-TR in its MLF package?

The MIC5305-4.75YML-TR has θ_JA = 93°C/W in the 2mm × 2mm MLF® package. At 150mA load with 5.0V input, power dissipation is ~0.32W, allowing continuous operation up to 95°C ambient temperature with standard PCB layout - verified per Micrel's thermal resistance table.

Is MIC5305-4.75YML-TR pin-compatible with other variants in the MIC5305 family?

Yes. All MIC5305-x.xBML/YML fixed-voltage variants share identical 6-pin 2mm × 2mm MLF® pinout and footprint, including EN, GND, VIN, VOUT, NC, and BYP. Only the output voltage and marking differ - enabling drop-in replacement across voltage options.