Microchip Technology MIC2876-AYMT-TR

Overview

MIC2876-AYMT-TR 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 power delivery in portable devices.

For engineers reviewing the MIC2876-AYMT-TR datasheet, MIC2876-AYMT-TR pinout, MIC2876-AYMT-TR application, or MIC2876-AYMT-TR 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 bi-directional isolation enabling zero leakage during disable.

Technical Context

The MIC2876-AYMT-TR implements current-mode PWM control at 2 MHz switching frequency with internal high-side PMOS and low-side NMOS switches. Its bi-directional load disconnect uses an "always-on" maximum supply selector that functions down to 0.3V on IN, ensuring isolation regardless of input/output voltage polarity during shutdown.

It features pulse-skipping mode at light loads for efficiency preservation, soft-start limiting inrush current, and an integrated anti-ringing switch clamping SW to IN during DCM to suppress parasitic ringing - all within a single 8-pin UDFN package with thermally enhanced ePad.

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 TPS61232DRVR and MAX17222ETA+, the MIC2876-AYMT-TR uniquely combines 4.8A current capability, bi-directional isolation, and automatic bypass in a 2 mm × 2 mm footprint - making it the only option among the three qualified for USB OTG host and parallel Li-cell charging where reverse current blocking and wide VIN/VOUT overlap are mandatory.

Availability

MIC2876-AYMT-TR is available at Aetrix Electronics and suitable for USB OTG power delivery, portable battery packs, and high-current Li-ion charging applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MIC2876-AYMT-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 is a global provider of microcontrollers, analog components, and Flash-IP solutions, serving industrial, automotive, consumer, and communications markets with vertically integrated design and manufacturing.

The MIC2876 product line delivers highly integrated, thermally optimized DC/DC boost regulators targeting space- and efficiency-critical portable electronics - designed specifically for USB power delivery, battery backup, and multi-cell charging architectures.

FAQ

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

The MIC2876-AYMT-TR is the fixed-output variant of the MIC2876 family, delivering a factory-trimmed 5.0V output with ±1.5% accuracy across temperature and load. It uses the OUTS pin internally connected to OUT, eliminating external feedback resistors - unlike the adjustable MIC2876-YMT-TR which requires an FB resistor divider. This simplifies layout and improves reliability in high-volume portable designs.

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

Yes, the MIC2876-AYMT-TR automatically enters bypass mode when VIN ≥ VOUT (i.e., ≥5.0V). In this state, the NMOS switch turns off and the PMOS synchronously rectifier conducts with minimal R_DS(on), creating a low-impedance path from IN to OUT. This reduces conduction loss and heat generation - critical for extending battery life when input voltage rises near or above the regulated output, such as during USB-C PD negotiation or multi-cell battery discharge.

What thermal management is required for the MIC2876-AYMT-TR in continuous 2A operation?

For continuous 2A output at 5V with 3.6V input, the MIC2876-AYMT-TR dissipates ~0.4W. With θ_JA = 90°C/W, junction temperature rise is ~36°C above ambient - well within the –40°C to +125°C rating. To achieve this, the exposed thermal pad (EP) must be soldered to a solid AGND plane with ≥6 thermal vias (0.3mm diameter) connecting to an inner ground layer. Avoid thermal relief on EP pads and ensure ≥100 mm² copper area under the package.

How does the bi-directional load disconnect in the MIC2876-AYMT-TR prevent reverse current flow?

The MIC2876-AYMT-TR uses an "always-on" maximum supply selector circuit that monitors both IN and OUT voltages. When disabled (EN = low), it actively turns off the back-gate diode of the internal PMOS synchronous rectifier - isolating the output from input regardless of which rail is higher. This prevents leakage currents as low as 2 µA (VOUT shutdown current) even when VIN = 0.3V and VOUT = 5.5V, enabling true zero-drain battery backup operation.

Can the MIC2876-AYMT-TR be used with input voltages below 2.5V?

No - the MIC2876-AYMT-TR has a guaranteed operating input range of 2.5V to 5.5V, with UVLO rising threshold at 2.32V (typical) and hysteresis of 200mV. Operation below 2.5V risks undefined behavior, including failure to start, unstable regulation, or premature UVLO shutdown. For sub-2.5V inputs, consider the MIC2877 series or discrete boost solutions with lower startup voltage.