Microchip Technology MIC2876-AYMT-T5

Overview

MIC2876-AYMT-T5 from Microchip Technology is a fully integrated, 2 MHz synchronous boost regulator with bi-directional true load disconnect, 4.8A switch current capability, and fixed 5.0V output. It operates from 2.5V to 5.5V input, delivers up to 95% efficiency, and supports automatic bypass mode when VIN ≥ VOUT - ideal for USB OTG host power delivery in portable equipment.

For engineers reviewing the MIC2876-AYMT-T5 datasheet, MIC2876-AYMT-T5 pinout, MIC2876-AYMT-T5 application, or MIC2876-AYMT-T5 equivalent, key selection criteria include its 2 mm × 2 mm UDFN-8 package with exposed thermal pad, <1 µA shutdown current, integrated anti-ringing switch for EMI reduction, and –40°C to +125°C junction temperature range.

Technical Context

The MIC2876-AYMT-T5 implements current-mode PWM control with internal 2 MHz oscillator and soft-start circuitry. Its bi-directional load disconnect uses NMOS/PMOS power stage with back-gate diode isolation, enabling leakage-free shutdown even with only 0.3V on IN.

It features automatic transition between pulse-skipping (PFM) at light loads and fixed-frequency PWM under heavier loads, plus integrated anti-ringing switch clamping SW to IN during DCM to suppress ringing. Bypass mode activates when VIN exceeds target VOUT, turning off NMOS and fully enhancing PMOS for low-impedance IN-to-OUT conduction.

Key Specifications

Pinout & Package

Package: 8-pin 2 mm × 2 mm UDFN with exposed thermal pad (EP), RoHS-compliant, moisture-sensitive level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61236PRTJR and MAX17222ATA+T, the MIC2876-AYMT-T5 uniquely combines 4.8A capability, bi-directional disconnect, bypass mode, and integrated anti-ringing in a 2 mm × 2 mm UDFN - making it the only option among the three qualified for high-current, battery-isolated USB OTG host designs.

Availability

MIC2876-AYMT-T5 is available at Aetrix Electronics and suitable for USB OTG host power delivery, HDMI source supplies, and portable power reserve applications requiring stable component supply, long-term lifecycle support, and industrial temperature qualification.

Supply support for MIC2876-AYMT-T5 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 leading provider of microcontrollers, analog components, and power management ICs, with global manufacturing and quality certifications including ISO 9001 and IATF 16949.

The MIC2876 product line was designed specifically for high-efficiency, compact-area boost conversion in battery-powered portable electronics - emphasizing low quiescent current, robust protection, and seamless integration into space-constrained PCB layouts.

FAQ

What is the output voltage configuration of the MIC2876-AYMT-T5?

The MIC2876-AYMT-T5 is the fixed-output variant of the MIC2876 family, delivering a factory-trimmed 5.0V ±1.5% output. It uses the OUTS pin internally tied to OUT, eliminating the need for external feedback resistors. This configuration simplifies design for USB-compliant 5V applications and ensures consistent regulation without layout-dependent resistor tolerances.

Does the MIC2876-AYMT-T5 support automatic bypass mode, and how does it function?

Yes, the MIC2876-AYMT-T5 automatically enters bypass mode when the input voltage exceeds the target output voltage (VIN ≥ VOUT). In this mode, the NMOS switch turns off and the PMOS is fully enhanced, creating a low-impedance path from IN to OUT. This avoids unnecessary power conversion loss and extends battery runtime - especially valuable during partial discharge of Li-ion cells approaching 4.2V.

What is the purpose of the /PG pin on the MIC2876-AYMT-T5, and how should it be used?

The /PG pin on the MIC2876-AYMT-T5 is an open-drain, active-low power-good indicator that asserts low when VOUT reaches ≥0.9×VOUT (i.e., ≥4.5V for the 5.0V version). It requires an external 1 MΩ pull-up resistor to a valid logic rail. System designers use /PG for power sequencing, fault detection, or enabling downstream circuitry only after stable 5V is established - ensuring reliable startup in multi-rail portable devices.

How does the bi-directional load disconnect feature work in the MIC2876-AYMT-T5?

The MIC2876-AYMT-T5 achieves bi-directional load disconnect using a controlled PMOS back-gate diode isolation scheme. When EN is low, both NMOS and PMOS switches are turned off, and an internal "maximum supply selector" ensures the PMOS body diode remains reverse-biased regardless of whether VIN or VOUT is higher. This blocks leakage in either direction - critical for battery-backed systems where reverse current could drain auxiliary cells or cause safety hazards.

What thermal management practices are required for reliable operation of the MIC2876-AYMT-T5 at full load?

Reliable full-load operation of the MIC2876-AYMT-T5 requires connecting the exposed thermal pad (EP) to a solid AGND plane using ≥6 thermal vias (0.3 mm diameter, filled or capped). The PCB must provide ≤90°C/W total thermal resistance (θJA); exceeding this causes thermal shutdown at ~155°C. For 2A continuous output, keep ambient below 60°C and avoid enclosing the IC - airflow or copper area expansion beyond the 2 mm × 2 mm footprint significantly improves derating margin.