Microchip Technology MIC5514-3.0YMT-TR

Overview

MIC5514-3.0YMT from Micrel is a fixed-output 3.0V, 300mA low-dropout linear regulator in a 6-pin 1.6mm × 1.6mm Thin DFN package, featuring ±1% initial output accuracy, 160mV dropout at full load, and an internal 4MΩ enable pull-down resistor. It delivers stable power to portable electronics with auto-discharge on shutdown and operates across –40°C to +125°C junction temperature.

For engineers reviewing the MIC5514-3.0YMT datasheet, MIC5514-3.0YMT pinout, MIC5514-3.0YMT application, or MIC5514-3.0YMT equivalent, key selection criteria include its ultra-small footprint, guaranteed 300mA output, enable pull-down behavior for floating-control safety, and compatibility with 1µF ceramic capacitors without external compensation.

Technical Context

The MIC5514-3.0YMT implements a CMOS-based LDO architecture with active-high enable control and integrated output discharge via a 25Ω NFET. Its internal pull-down resistor ensures deterministic disable state during processor boot-up when EN is unconnected.

It achieves stability with minimal 1µF input and output ceramic capacitors (X5R/X7R), supports input voltages from 2.5V to 5.5V, and maintains regulation down to zero load while drawing only 0.05–1µA in shutdown - critical for battery-powered systems requiring low quiescent current and fast turn-on (<125µs).

Key Specifications

Pinout & Package

Package: 6-pin 1.6mm × 1.6mm Thin DFN (MT) with exposed thermal pad (ePad), RoHS-compliant, NiPdAu lead finish, halogen-free mold compound.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703-3002E/MB and XC6219B302MR-G, the MIC5514-3.0YMT uniquely combines guaranteed 300mA delivery, 160mV dropout, auto-discharge, and built-in EN pull-down - making it optimal for space-constrained, battery-sensitive designs requiring deterministic power sequencing.

Availability

MIC5514-3.0YMT is available at Aetrix Electronics and suitable for smartphones, portable medical sensors, GPS navigation units, and industrial handheld terminals requiring stable component supply and long-term lifecycle support.

Supply support for MIC5514-3.0YMT 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 MIC55xx family was designed specifically for ultra-compact, high-efficiency LDO applications in battery-powered portable electronics - emphasizing minimal footprint, low quiescent current, and robust enable control.

FAQ

What is the dropout voltage specification for MIC5514-3.0YMT at 300mA load?

The MIC5514-3.0YMT has a maximum dropout voltage of 380mV and a typical value of 160mV at 300mA output current. This means it can maintain regulation with only 160mV headroom between input and output - allowing operation from as low as 3.16V input when delivering 3.0V at full rated current. The specification is measured under standard test conditions (VIN = VOUT + 1V to 5.5V, TJ = 25°C) and remains valid across the full –40°C to +125°C junction temperature range.

Does MIC5514-3.0YMT require external components for stability?

No, the MIC5514-3.0YMT is internally compensated and stable with only 1µF ceramic input and output capacitors (X5R or X7R dielectric). Unlike many LDOs, it does not require additional ESR or series resistance for phase margin control. The design eliminates need for external feedforward capacitors, bias resistors, or discharge networks - simplifying layout and reducing BOM count. Its stability is verified across temperature, load, and input voltage ranges per the official Micrel datasheet Rev. 1.1.

How does the enable pull-down resistor in MIC5514-3.0YMT improve system reliability?

The MIC5514-3.0YMT integrates a 4MΩ pull-down resistor on its EN pin, ensuring the regulator remains disabled when the enable signal is left floating - such as during microcontroller reset, cold boot, or unpowered states. This prevents unintended power-up that could corrupt memory, trigger false sensor readings, or cause latch-up in downstream circuitry. In contrast, the MIC5512 variant requires an external pull-down; the MIC5514-3.0YMT's internal solution reduces component count and improves first-power reliability in portable and embedded systems.

What thermal performance can be expected from MIC5514-3.0YMT in a standard PCB layout?

With the exposed thermal pad (ePad) properly soldered to a minimum 100mm² GND copper pour, the MIC5514-3.0YMT achieves a junction-to-ambient thermal resistance (θJA) of 92.4°C/W. At 300mA load with 3.6V input and 3.0V output, power dissipation is ~0.24W - resulting in a ~22°C junction-to-ambient rise. This allows continuous full-load operation up to ~103°C ambient temperature before reaching the 125°C max junction limit, as confirmed in the Micrel thermal analysis example (Rev. 1.1, p.9).

Is MIC5514-3.0YMT compatible with 1µF ceramic output capacitors from major vendors?

Yes, the MIC5514-3.0YMT is explicitly characterized and guaranteed stable with 1µF X5R or X7R ceramic output capacitors - including Murata GRM155R61A105KE15D (0402 case) referenced in the official typical application schematic. It rejects Y5V and Z5U dielectrics due to excessive capacitance drift over temperature. The device's stability margin is maintained across vendor variations as long as ESR remains below 10mΩ and capacitance stays ≥1µF over the full operating temperature range.