Microchip Technology MIC5524-2.8YMT-TZ

Overview

MIC5524-2.8YMT from Micrel is a fixed-output 2.8V, 500mA low-dropout linear regulator in a 1mm × 1mm Thin DFN package, featuring ±1% output accuracy, 260mV dropout at full load, and 38µA quiescent current. It delivers stable power to space-constrained portable electronics with auto-discharge, internal enable pulldown, and thermal/current protection.

For engineers reviewing the MIC5524-2.8YMT datasheet, MIC5524-2.8YMT pinout, MIC5524-2.8YMT application, or MIC5524-2.8YMT equivalent, key selection considerations include its µCap compatibility with 2.2µF ceramic output capacitors, TTL-compatible enable input, –40°C to +125°C operating junction temperature, and PSRR of 80dB at 100Hz.

Technical Context

The MIC5524-2.8YMT employs a CMOS-based LDO architecture with internal bandgap reference, error amplifier, and pass transistor optimized for fast transient response and high PSRR. Its auto-discharge circuit activates via an internal 25Ω NFET when EN is low, ensuring rapid output discharge without external components.

It integrates thermal shutdown and foldback current limiting for fault protection, and uses an internal 4MΩ enable pulldown to guarantee disable state during floating control signals-critical for processor boot-up sequences in battery-powered systems.

Key Specifications

Pinout & Package

Package: 4-pin 1mm × 1mm Thin DFN (TDFN-4) with exposed thermal pad (ePad), RoHS-compliant, halogen-free, NiPdAu lead finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCP1703-2802E/TO and TLS850B2TEV50, the MIC5524-2.8YMT offers higher output current and lower dropout in a smaller footprint, but lacks automotive qualification or sub-µA quiescent current-making it optimal for cost-sensitive, space-constrained industrial and consumer portable designs.

Availability

MIC5524-2.8YMT is available at Aetrix Electronics and suitable for portable medical devices, GPS modules, 5V POL conversion, and industrial handheld terminals requiring stable component supply across production lifecycles.

Supply support for MIC5524-2.8YMT 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 analog and mixed-signal semiconductor company founded in 1978 and acquired by Microchip Technology in 2015; known for high-performance power management and timing solutions.

The MIC5524 product line delivers ultra-small-footprint, high-accuracy LDOs targeting battery-powered portable electronics where board space, efficiency, and thermal performance are critical constraints.

FAQ

What is the maximum input voltage for MIC5524-2.8YMT?

The absolute maximum input voltage for MIC5524-2.8YMT is 6V, but the recommended operating range is 2.5V to 5.5V per the datasheet. Exceeding 5.5V may trigger internal protection or cause permanent damage. For reliable long-term operation, maintain VIN ≤ 5.5V, especially under thermal stress or high load conditions. The MIC5524-2.8YMT is designed for single-cell Li-ion, USB, or intermediate bus applications within this window.

Does MIC5524-2.8YMT require an input capacitor?

Yes, MIC5524-2.8YMT requires a minimum 2.2µF ceramic input capacitor from VIN to GND for stability and noise filtering. X5R or X7R dielectric types are recommended; Y5V is not advised due to severe capacitance loss over temperature. This capacitor must be placed close to the VIN and GND pins, and the ePad must be connected to the same GND plane to ensure proper high-frequency bypassing and thermal performance of the MIC5524-2.8YMT.

Can MIC5524-2.8YMT operate without any load connected?

Yes, MIC5524-2.8YMT remains stable and in regulation with zero load-a key differentiator from many LDOs. This no-load stability is confirmed in the datasheet's Application Information section and is essential for applications like CMOS RAM keep-alive circuits or always-on sensor bias rails. The MIC5524-2.8YMT maintains 2.8V output accuracy and low quiescent current (38µA) even with IOUT = 0mA.

What is the purpose of the ePad on MIC5524-2.8YMT?

The ePad on MIC5524-2.8YMT is an exposed thermal pad that serves dual functions: thermal dissipation and electrical grounding. It must be soldered to a solid GND plane to achieve the specified θJA = 250°C/W and prevent thermal shutdown under 500mA load. Leaving the ePad unconnected degrades thermal performance significantly and risks premature current limiting or failure. Proper PCB layout per Micrel's recommended landing pattern is mandatory for reliable operation of the MIC5524-2.8YMT.

How does the auto-discharge feature work on MIC5524-2.8YMT?

When the EN pin is driven low, MIC5524-2.8YMT activates an internal 25Ω NFET between VOUT and GND, actively discharging external output capacitors. This prevents residual voltage from holding up downstream circuitry during power-down sequencing. The feature operates independently of load current and is effective across the full –40°C to +125°C temperature range. Unlike passive bleed resistors, this controlled discharge ensures predictable timing and eliminates need for external components in the MIC5524-2.8YMT design.