Microchip Technology MIC5366-3.0YMT-TZ

Overview

MIC5366-3.0YMT-TZ from Micrel is a fixed-output 3.0V, 150mA low-dropout linear regulator in a 4-pin 1mm × 1mm Thin MLF package, featuring auto-discharge on disable, 2% initial output accuracy, 155mV dropout at full load, and 29µA quiescent current - optimized for space-constrained portable electronics requiring fast transient response and ultra-low off-state current.

For engineers reviewing the MIC5366-3.0YMT-TZ datasheet, MIC5366-3.0YMT-TZ pinout, MIC5366-3.0YMT-TZ application, or MIC5366-3.0YMT-TZ equivalent, this page delivers verified electrical parameters, thermal performance data, enable logic behavior, auto-discharge resistance value, and real-world layout guidance for battery-powered handheld systems.

Technical Context

The MIC5366-3.0YMT-TZ implements a CMOS-based LDO architecture with active-high enable control and an integrated NFET discharge path activated only when EN is low. Its internal reference and error amplifier deliver ±2% output accuracy over –40°C to +125°C junction temperature.

It operates across 2.5V–5.5V input range, sustains 150mA output with <155mV dropout at 3.0V output, achieves 70dB PSRR up to 1kHz, and remains stable with ≥1µF ceramic output capacitance - no minimum load required.

Key Specifications

Pinout & Package

Package: 4-pin 1mm × 1mm Thin MLF (RoHS-compliant, NiPdAu lead finish, exposed heatsink pad). Pin 1 marked with ▲ identifier.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC5365-3.0YMT and XC6206P302MR-G, the MIC5366-3.0YMT-TZ uniquely combines 1mm² footprint, active-high enable, and integrated 30Ω discharge - making it the only option for space-limited, fast-shutdown portable systems requiring guaranteed output voltage collapse.

Availability

MIC5366-3.0YMT-TZ is available at Aetrix Electronics and suitable for mobile handsets, GPS receivers, digital cameras, and portable media players requiring stable component supply with consistent parametric performance across production lots.

Supply support for MIC5366-3.0YMT-TZ 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 power management, analog, and RF solutions before its acquisition by Microchip Technology in 2015.

The MIC5365/6 family was designed specifically for ultra-compact, battery-powered portable electronics demanding high PSRR, low quiescent current, and minimal PCB area - targeting next-generation handheld and wearable platforms.

FAQ

What is the maximum input voltage rating for the MIC5366-3.0YMT-TZ?

The MIC5366-3.0YMT-TZ has an absolute maximum input voltage of 6V, but its recommended operating input range is 2.5V to 5.5V. Exceeding 5.5V may trigger internal protection or cause reliability degradation. The device maintains regulation across this full range while delivering 3.0V ±2% output, making MIC5366-3.0YMT-TZ compatible with single-cell Li-ion (up to 4.2V) and dual-cell alkaline (up to 3.2V) sources.

Does the MIC5366-3.0YMT-TZ require an external pull-up resistor on the EN pin?

No, the MIC5366-3.0YMT-TZ does not require an external pull-up resistor on the EN pin. Its enable input uses CMOS-compatible thresholds (logic high ≥1.2V, logic low ≤0.2V) and draws only 0.01–1µA. However, the EN pin must never be left floating - it should be driven directly by a GPIO or tied to VIN/GND through a solid connection to ensure deterministic on/off behavior in all operating conditions of MIC5366-3.0YMT-TZ.

Can the MIC5366-3.0YMT-TZ operate without an output capacitor?

No, the MIC5366-3.0YMT-TZ requires a minimum 1µF ceramic output capacitor connected from VOUT to GND for stability. Unlike some older LDOs, it is not stable under no-capacitor or very low-ESR film-capacitor conditions. X5R or X7R dielectric ceramics are recommended; Y5V types are discouraged due to severe capacitance loss over temperature. This requirement is mandatory for all operating conditions of MIC5366-3.0YMT-TZ, including zero-load states.

What is the thermal resistance (θ_JA) of the MIC5366-3.0YMT-TZ in its native package?

The MIC5366-3.0YMT-TZ in the 4-pin 1mm × 1mm Thin MLF package has a junction-to-ambient thermal resistance (θ_JA) of 240°C/W when mounted on a standard JEDEC 2-layer test board with the exposed pad soldered to a 1cm² copper area. This value assumes proper PCB thermal design - reducing θ_JA further requires additional thermal vias and internal ground planes. The 240°C/W rating directly determines maximum ambient temperature under load, e.g., 95°C at 150mA with 3.6V input for MIC5366-3.0YMT-TZ.

How does the auto-discharge feature of the MIC5366-3.0YMT-TZ behave during shutdown?

When the EN pin of the MIC5366-3.0YMT-TZ is pulled low (≤0.2V), the internal 30Ω NFET discharge switch connects VOUT to GND, actively sinking current from the output capacitor. This collapses the output voltage rapidly - typically within tens of microseconds - eliminating residual charge that could interfere with system reset sequencing or cause back-powering of upstream circuitry. The discharge path is disabled immediately upon EN rising above 1.2V, and no current flows through it during normal regulation. This behavior is exclusive to MIC5366-3.0YMT-TZ and not present in MIC5365 variants.