Microchip Technology MIC5366-2.5YMT-TZ

Overview

MIC5366-2.5YMT-TZ from Micrel is a fixed-output 2.5V, 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 150mA, and 29µA quiescent current - optimized for space-constrained portable electronics requiring fast transient response and ultra-low standby power.

For engineers reviewing the MIC5366-2.5YMT-TZ datasheet, MIC5366-2.5YMT-TZ pinout, MIC5366-2.5YMT-TZ application, or MIC5366-2.5YMT-TZ equivalent, key selection criteria include its auto-discharge function (exclusive to MIC5366 variants), 1µF ceramic capacitor stability, –40°C to +125°C operating range, and zero-off-mode current draw below 1µA when disabled.

Technical Context

The MIC5366-2.5YMT-TZ implements a CMOS-based LDO architecture with active-high enable control and integrated NFET auto-discharge circuit activated only when EN is low. Its internal reference and error amplifier deliver tight regulation across load (100µA–150mA) and line (2.5V–5.5V input) variations.

It achieves 70dB PSRR up to 1kHz and maintains stability with 1µF X5R/X7R ceramic output capacitors without requiring ESR tuning. Thermal shutdown and foldback current limiting protect against fault conditions while sustaining full 150mA output capability within its 240°C/W θJA thermal resistance.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC5365-2.5YMT and XC6206P252MR-G, the MIC5366-2.5YMT-TZ uniquely combines ultra-small 1mm² packaging, active enable control, and integrated auto-discharge - making it the only option among the three that supports deterministic power-down behavior in battery-powered portable systems.

Availability

MIC5366-2.5YMT-TZ is available at Aetrix Electronics and suitable for mobile phones, digital cameras, GPS receivers, and industrial handheld scanners requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MIC5366-2.5YMT-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 high-performance analog, power management, and timing 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 footprint - targeting applications where every square millimeter and microamp matters.

FAQ

What is the auto-discharge function of the MIC5366-2.5YMT-TZ, and how does it operate?

The MIC5366-2.5YMT-TZ integrates an internal 30Ω NFET between VOUT and GND that activates automatically when the EN pin is driven low. This discharges the output capacitor rapidly - typically within microseconds - preventing residual voltage from interfering with downstream logic reset or power sequencing. Unlike MIC5365 variants, this feature is exclusive to MIC5366 part numbers and requires no external components. The MIC5366-2.5YMT-TZ leverages this for clean, deterministic power-down in portable systems.

Can the MIC5366-2.5YMT-TZ operate with input voltages below 2.5V?

No. The MIC5366-2.5YMT-TZ has a minimum input voltage specification of 2.5V, matching its 2.5V output. Operation below 2.5V violates the absolute minimum supply voltage rating and will result in loss of regulation or complete shutdown. For sub-2.5V operation, alternative LDOs with lower V_IN(min) - such as those supporting 1.7V input - must be selected. The MIC5366-2.5YMT-TZ is intended for use with sources like single-cell Li-ion (2.7–4.2V), USB (4.75–5.25V), or regulated 3.3V supplies.

What output capacitor value and type are required for stable operation of the MIC5366-2.5YMT-TZ?

The MIC5366-2.5YMT-TZ requires a minimum 1µF ceramic output capacitor with X5R or X7R dielectric for guaranteed stability across temperature and load. Y5V or Z5U dielectrics are not recommended due to excessive capacitance loss over temperature. The capacitor must be placed as close as possible to the VOUT and GND pins. Larger values (e.g., 2.2µF or 4.7µF) are acceptable but provide no significant improvement in transient response or PSRR beyond the 1µF baseline design point specified in the datasheet.

Is the MIC5366-2.5YMT-TZ pin-compatible with other MIC5365/6 variants in the same package?

Yes - all MIC5365/6 variants in the 4-pin 1mm × 1mm Thin MLF (YMT) package share identical pinout: Pin 1 = VOUT, Pin 2 = GND, Pin 3 = EN, Pin 4 = VIN. This allows direct substitution between voltage options (e.g., MIC5366-1.8YMT, MIC5366-3.3YMT) and between MIC5365 and MIC5366 versions, provided the auto-discharge requirement is verified. The MIC5366-2.5YMT-TZ maintains full mechanical and electrical compatibility with these parts in the same footprint.

Does the MIC5366-2.5YMT-TZ require an input capacitor, and what are the specifications?

Yes. A 1µF ceramic input capacitor (X5R or X7R dielectric, 0402 or smaller) is mandatory from VIN to GND to ensure stability and high-frequency noise suppression. This capacitor must be placed adjacent to the VIN and GND pins. The MIC5366-2.5YMT-TZ's high bandwidth makes it sensitive to input impedance; omitting or undersizing this capacitor risks oscillation or degraded PSRR. Additional small-value NPO capacitors (e.g., 10nF) may be added in parallel for enhanced RF filtering, particularly in cellular or GNSS applications.