Microchip Technology MIC5514-2.8YMT-TR

Overview

MIC5514-2.8YMT from Micrel is a fixed-output 2.8V, 300mA low-dropout linear regulator in a 6-pin 1.6mm × 1.6mm Thin DFN package, featuring active-high enable with internal 4MΩ pull-down resistor, auto-discharge circuit (25Ω NFET), and ±1% initial output accuracy - designed for stable power delivery in portable electronics during processor boot-up sequences where EN may float.

For engineers reviewing the MIC5514-2.8YMT datasheet, MIC5514-2.8YMT pinout, MIC5514-2.8YMT application, or MIC5514-2.8YMT equivalent, key selection criteria include dropout voltage at full load (160mV @ 300mA), ground current in shutdown (<1µA), stability with 1µF ceramic output capacitors, and thermal performance (θJA = 92.4°C/W) in ultra-compact battery-powered designs.

Technical Context

The MIC5514-2.8YMT integrates a CMOS-based LDO control architecture with internal bandgap reference, error amplifier, and pass transistor, optimized for fast transient response and low noise (175µVRMS, 10Hz–100kHz). Its enable logic includes a built-in 4MΩ pull-down resistor to guarantee disable state when EN is unconnected - eliminating external bias components required by MIC5512 variants.

Auto-discharge functionality activates a 25Ω internal NFET between VOUT and GND upon EN deactivation, ensuring rapid capacitor discharge without external circuitry. The regulator operates across 2.5V–5.5V input range and maintains regulation down to –40°C, with guaranteed 300mA output current and thermal shutdown protection.

Key Specifications

Pinout & Package

Package: 6-pin 1.6mm × 1.6mm Thin DFN (MT) with exposed ePad (to be connected to GND for optimal thermal and electrical performance).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MIC5512-2.8YMT and XC6219B282MR-G, the MIC5514-2.8YMT uniquely combines guaranteed disable-on-float EN behavior, integrated auto-discharge, and 300mA capability in a 1.6mm × 1.6mm DFN - enabling drop-in replacement in space-constrained portable designs without layout or BOM changes.

Availability

MIC5514-2.8YMT is available at Aetrix Electronics and suitable for smartphones, medical wearables, GPS receivers, and industrial handheld scanners requiring stable component supply with guaranteed long-term manufacturability and RoHS-compliant packaging.

Supply support for MIC5514-2.8YMT 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, timing, and interface ICs, acquired by Microchip Technology in 2015.

The MIC55xx family was designed specifically for ultra-compact, battery-powered portable electronics requiring high accuracy, low quiescent current, and robust enable/discharge control - targeting applications where board space and startup reliability are critical.

FAQ

What is the dropout voltage specification for MIC5514-2.8YMT at full 300mA load?

The MIC5514-2.8YMT has a maximum dropout voltage of 380mV and a typical value of 160mV at 300mA output current. This means it sustains regulation with as little as 2.96V input (2.8V + 160mV) under nominal conditions - essential for maintaining 2.8V rail integrity during battery voltage sag in portable systems. The datasheet specifies this at TJ = 25°C, with worst-case 380mV across –40°C to +125°C.

Does MIC5514-2.8YMT require an external pull-down resistor on the EN pin?

No, the MIC5514-2.8YMT includes an internal 4MΩ pull-down resistor on the EN pin, ensuring the device remains disabled when the enable signal is left floating - a key differentiator from the MIC5512 variant. This eliminates the need for external biasing components and prevents unintended activation during processor boot-up sequences where GPIOs are uninitialized. The MIC5514-2.8YMT datasheet explicitly confirms this feature in both the General Description and Pin Description sections.

Can MIC5514-2.8YMT operate with a 1µF ceramic output capacitor?

Yes, the MIC5514-2.8YMT is fully stable with a minimum 1µF X5R or X7R ceramic output capacitor, as confirmed in the datasheet's "Output Capacitor" section and Electrical Characteristics table. Unlike many LDOs, it imposes no minimum ESR requirement, simplifying design and reducing component count. Y5V dielectrics are not recommended due to excessive capacitance loss over temperature.

What is the maximum junction temperature and thermal resistance for MIC5514-2.8YMT?

The MIC5514-2.8YMT has a maximum junction temperature of +150°C and a junction-to-ambient thermal resistance (θJA) of 92.4°C/W in the 1.6mm × 1.6mm Thin DFN package. At 300mA load with 3.6V input and 2.8V output, power dissipation is ~0.24W, allowing a maximum ambient temperature of ~103°C before thermal shutdown - provided the ePad is properly soldered to a GND plane per the recommended PCB layout.

How does the auto-discharge function work in MIC5514-2.8YMT?

When the EN pin is driven low, the MIC5514-2.8YMT activates an internal 25Ω NFET between VOUT and GND, discharging external output capacitors rapidly. This prevents residual voltage from interfering with system reset timing or causing latch-up in downstream logic. The auto-discharge circuit is present in all MIC5512/14 variants and is explicitly characterized in the Electrical Characteristics table under "Auto-Discharge NFET Resistance" with 25Ω typical value at VIN = 3.6V and IOUT = –3mA.