Microchip Technology MIC5504-1.8YMT-TZ

Overview

MIC5504-1.8YMT-TZ from Microchip Technology is a 300 mA, fixed 1.8 V output low-dropout linear regulator with auto-discharge and internal enable pull-down, operating from 2.5 V to 5.5 V input, delivering ±2% output accuracy and 160 mV dropout at full load - ideal for powering core logic in battery-powered portable electronics such as medical wearables and handheld instrumentation.

For engineers reviewing the MIC5504-1.8YMT-TZ datasheet, MIC5504-1.8YMT-TZ pinout, MIC5504-1.8YMT-TZ application, or MIC5504-1.8YMT-TZ equivalent, key selection criteria include guaranteed 300 mA output current, ultra-low 38 µA quiescent current, stable operation with 1 µF ceramic output capacitors, and integrated thermal shutdown and current limiting - all in a 1.0 mm × 1.0 mm thin DFN package.

Technical Context

The MIC5504-1.8YMT-TZ integrates both auto-discharge (25 Ω NFET on VOUT when EN = low) and an internal 4 MΩ enable pull-down resistor, eliminating external components required for safe power sequencing during processor boot-up. Its CMOS-based architecture ensures low ground current across load range (38 µA typ. at no load, 42 µA typ. at 300 mA).

Designed for high PSRR (60 dB at 1 kHz) and low noise (175 µV_RMS, 10 Hz–100 kHz), it maintains regulation under zero-load conditions - critical for CMOS RAM keep-alive circuits - and operates across –40°C to +125°C junction temperature with thermal shutdown protection.

Key Specifications

Pinout & Package

Package: 4-Lead 1.0 mm × 1.0 mm Thin DFN (TDFN-4, MT suffix), exposed thermal pad (ePAD) to be connected to GND for optimal thermal performance (θ_JA = 250°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1700-1802E/TO and XC6210B182MR-G, the MIC5504-1.8YMT-TZ uniquely combines 300 mA drive, auto-discharge, and EN pull-down in a 1 mm² footprint - enabling simpler, more robust power sequencing in compact portable designs without compromising output capability or efficiency.

Availability

MIC5504-1.8YMT-TZ is available at Aetrix Electronics and suitable for wearable medical devices, portable diagnostic instruments, and industrial edge controllers requiring stable component supply with long-term lifecycle assurance.

Supply support for MIC5504-1.8YMT-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

Microchip Technology is a U.S.-based semiconductor company specializing in microcontrollers, analog, and interface ICs, with broad expertise in power management and embedded control solutions.

The MIC5504 belongs to Microchip's MIC550x family of ultra-small, high-performance LDOs designed specifically for space- and power-constrained portable electronics requiring reliable sequencing, low IQ, and robust fault protection.

FAQ

What is the maximum input voltage rating for the MIC5504-1.8YMT-TZ?

The MIC5504-1.8YMT-TZ has an absolute maximum input voltage (VIN) rating of +6 V. However, its specified operating input range is +2.5 V to +5.5 V. Exceeding 5.5 V may cause permanent damage or violate functional specifications, even if below the 6 V absolute limit. Always maintain VIN within 2.5–5.5 V during normal operation to ensure reliability and compliance with electrical characteristics.

Does the MIC5504-1.8YMT-TZ require an external pull-down resistor on the EN pin?

No, the MIC5504-1.8YMT-TZ does not require an external pull-down resistor on the EN pin. It integrates a 4 MΩ internal pull-down resistor, ensuring the output remains disabled when the EN signal is left floating - a key feature for safe power-up sequencing in microcontroller-based systems where the enable line may be un-driven during reset.

Can the MIC5504-1.8YMT-TZ operate stably with no load connected to VOUT?

Yes, the MIC5504-1.8YMT-TZ remains stable and in regulation with zero load current - a verified design feature confirmed in Section 4.3 ("No-Load Stability") of the official datasheet. This behavior is essential for applications like CMOS RAM keep-alive circuits or backup power domains where the output may be idle for extended periods without compromising regulation.

What is the purpose of the auto-discharge function in the MIC5504-1.8YMT-TZ?

The auto-discharge function in the MIC5504-1.8YMT-TZ activates a 25 Ω internal NFET between VOUT and GND when the EN pin is driven low. This rapidly discharges external output capacitors, preventing residual voltage from holding up downstream circuitry - critical for deterministic power-down sequencing in portable electronics and avoiding false wake-up events in low-power systems.

Is the MIC5504-1.8YMT-TZ compatible with 1 µF ceramic output capacitors?

Yes, the MIC5504-1.8YMT-TZ is explicitly designed and characterized for stable operation with a minimum 1 µF X5R or X7R ceramic output capacitor. The datasheet confirms this in Sections 4.2 and 5.0, and recommends against Y5V or Z5U dielectrics due to excessive capacitance drift over temperature - ensuring predictable transient response and loop stability across –40°C to +125°C.