Microchip Technology MIC5504-3.1YMT-TR

Overview

MIC5504-3.1YMT-TR from Microchip Technology is a 300 mA, fixed 3.1 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 microcontroller I/O rails in portable medical devices.

For engineers reviewing the MIC5504-3.1YMT-TR datasheet, MIC5504-3.1YMT-TR pinout, MIC5504-3.1YMT-TR application, or MIC5504-3.1YMT-TR equivalent, key selection criteria include guaranteed 300 mA output current, 38 μA quiescent current, 1 μF ceramic capacitor stability, thermal shutdown protection, and compatibility with ultra-compact 1.0 mm × 1.0 mm thin DFN packaging.

Technical Context

The MIC5504-3.1YMT-TR integrates both auto-discharge (25 Ω NFET) and internal EN pull-down (4 MΩ), eliminating external components for safe output discharge and floating-enable immunity during processor boot-up. Its CMOS-based architecture enables zero-off-mode current (<1 μA shutdown) and stable no-load regulation critical for battery-backed memory retention.

Designed for high PSRR (60 dB at 1 kHz) and low noise (175 μV_RMS, 10 Hz–100 kHz), it maintains regulation across –40°C to +125°C junction temperature while rejecting line/load transients per Figures 2-13 and 2-15 - supporting robust operation in thermally constrained portable electronics.

Key Specifications

Pinout & Package

Package: 4-Lead 1.0 mm × 1.0 mm Thin DFN (TDFN-4, MT), exposed thermal pad (EP) 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 MCP1700-3102E/TO and XC6210B312MR-G, the MIC5504-3.1YMT-TR uniquely combines auto-discharge and EN pull-down in a 1.0 mm × 1.0 mm package - reducing bill-of-materials count by two components and eliminating layout risk associated with external discharge networks.

Availability

MIC5504-3.1YMT-TR is available at Aetrix Electronics and suitable for portable medical sensors, wearable health monitors, smartphone peripheral modules, and industrial handheld terminals requiring stable component supply with full RoHS compliance and extended temperature support.

Supply support for MIC5504-3.1YMT-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

Microchip Technology Inc. is a U.S.-based semiconductor manufacturer specializing in microcontrollers, analog devices, and power management ICs, with global design centers and manufacturing partnerships.

The MIC5504 family is part of Microchip's ultra-low-power LDO portfolio designed specifically for space-constrained, battery-operated portable electronics demanding high accuracy, low IQ, and integrated safety features.

FAQ

What is the maximum input voltage rating for the MIC5504-3.1YMT-TR?

The MIC5504-3.1YMT-TR has an absolute maximum input voltage rating of +6 V, but its specified operating input range is +2.5 V to +5.5 V. Exceeding 5.5 V may cause permanent damage or unpredictable behavior, even if below the 6 V absolute maximum. The MIC5504-3.1YMT-TR must be operated within its 2.5–5.5 V functional window for guaranteed performance and reliability.

Does the MIC5504-3.1YMT-TR require an external pull-down resistor on the EN pin?

No, the MIC5504-3.1YMT-TR includes an internal 4 MΩ pull-down resistor on the EN pin, ensuring the output remains disabled when the enable signal is left floating - such as during microcontroller reset or unconfigured GPIO states. This eliminates the need for an external pull-down resistor, simplifying layout and reducing BOM count compared to LDOs like the MIC5501 or MIC5502.

What is the purpose of the auto-discharge feature in the MIC5504-3.1YMT-TR?

The auto-discharge feature in the MIC5504-3.1YMT-TR activates a 25 Ω internal NFET between VOUT and GND when the EN pin is driven low, rapidly discharging external output capacitors. This prevents residual voltage from interfering with downstream logic states during power sequencing or hot-swap events - a critical function in portable medical and industrial handheld applications where data integrity must be preserved across power transitions.

Can the MIC5504-3.1YMT-TR operate stably with no load connected?

Yes, the MIC5504-3.1YMT-TR remains stable and in regulation with zero load current - a key differentiator from many legacy LDOs. This no-load stability is essential for applications like CMOS RAM keep-alive circuits or always-on sensor bias rails, where the MIC5504-3.1YMT-TR maintains precise 3.1 V output without oscillation or dropout, even when downstream circuitry is powered off.

What ceramic capacitor dielectric types are recommended for use with the MIC5504-3.1YMT-TR?

X5R and X7R dielectric ceramic capacitors are recommended for both input and output filtering with the MIC5504-3.1YMT-TR. These dielectrics maintain ≥85% of rated capacitance across –40°C to +125°C, ensuring stable loop compensation. Y5V and Z5U dielectrics are explicitly discouraged due to >50% capacitance loss over temperature, which risks instability and degraded transient response in the MIC5504-3.1YMT-TR.