Microchip Technology MIC2876-4.75YMT-TR

Overview

MIC2876-4.75YMT-TR from Microchip Technology is a fixed-output, 4.75V synchronous boost regulator with bi-directional load disconnect, 2.5V–5.5V input range, 2 MHz switching frequency, and 4.8A integrated switch-designed for USB OTG power delivery in portable devices.

For engineers reviewing the MIC2876-4.75YMT-TR datasheet, MIC2876-4.75YMT-TR pinout, MIC2876-4.75YMT-TR application, or MIC2876-4.75YMT-TR equivalent, key selection criteria include output voltage accuracy (±1.5%), shutdown current (<1 µA), bypass mode behavior (VIN ≥ VOUT), thermal performance (θJA = 90°C/W), and UDFN-8 2 mm × 2 mm package compatibility with high-density PCB layouts.

Technical Context

The MIC2876-4.75YMT-TR implements current-mode PWM control at 2 MHz with pulse-skipping at light loads to sustain >95% efficiency across 0–1.2A output. Its bi-directional disconnect uses NMOS/PMOS back-gate control to block leakage when disabled-even with as low as 0.3V on IN.

Integrated anti-ringing switch clamps SW to IN during DCM to suppress EMI; soft-start limits inrush by ramping PMOS conduction before full boost cycles begin. Bypass mode activates automatically when VIN exceeds 4.75V, turning off NMOS and fully enhancing PMOS for <100 mΩ IN-to-OUT path resistance.

Key Specifications

Pinout & Package

Package: 8-pin 2 mm × 2 mm UDFN (MT suffix), with exposed thermal pad (EP) requiring connection to AGND for optimal thermal performance and noise immunity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61236PRTJR and MAX77818EWL+T, the MIC2876-4.75YMT-TR uniquely combines fixed 4.75V output, sub-1 µA shutdown, and hardware-enforced bi-directional disconnect in a 2 mm × 2 mm UDFN-making it optimal for space-constrained, battery-sensitive USB OTG and portable reserve applications where simplicity and leakage control are critical.

Availability

MIC2876-4.75YMT-TR is available at Aetrix Electronics and suitable for USB OTG host power, portable power reserve supplies, and high-current parallel lithium cell applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for MIC2876-4.75YMT-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 semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with a focus on reliability, longevity, and design-in support for industrial and consumer applications.

The MIC2876 product line delivers highly integrated, high-efficiency synchronous boost regulators targeting portable electronics where small size, low quiescent current, and robust protection features are essential.

FAQ

What output voltage does the MIC2876-4.75YMT-TR deliver, and is it adjustable?

The MIC2876-4.75YMT-TR delivers a fixed 4.75V output with ±1.5% accuracy over temperature and load. It is not adjustable-the OUTS pin is internally connected to OUT, eliminating the need for external feedback resistors. For adjustable versions, Microchip offers the MIC2876-ADJ variants (e.g., MIC2876-ADJYMT-TR) with FB pin and external resistor divider support.

Does the MIC2876-4.75YMT-TR support automatic bypass mode, and how does it behave?

Yes, the MIC2876-4.75YMT-TR enters automatic bypass mode when VIN ≥ 4.75V. In this state, the NMOS switch turns off and the PMOS operates as a low-RDS(ON) pass device, providing a direct, low-loss path from IN to OUT. This eliminates switching losses and output ripple, extending battery life in high-input scenarios-verified in Figure 2-20 and Section 5.4 of the datasheet.

What is the maximum continuous output current capability of the MIC2876-4.75YMT-TR?

The MIC2876-4.75YMT-TR supports up to 1.2A continuous output current at 4.75V when operating from a 3.6V input, based on thermal limits (θJA = 90°C/W) and efficiency curves (Figure 2-1). Peak switch current is rated at 4.8A, but sustained output depends on PCB copper area, ambient temperature, and inductor DCR-refer to Equation 7-2 and Figure 7-3 for junction temperature estimation.

How does the bi-directional load disconnect function work in the MIC2876-4.75YMT-TR?

The MIC2876-4.75YMT-TR uses an internal "always-on" maximum supply selector that biases the PMOS back-gate diode to block conduction in both directions when EN = low. This prevents leakage from OUT to IN (e.g., back-powering a depleted battery) and from IN to OUT (e.g., loading a disabled downstream rail)-even with as little as 0.3V on IN, as detailed in Section 5.2.

What package type and thermal requirements apply to the MIC2876-4.75YMT-TR?

The MIC2876-4.75YMT-TR uses an 8-pin 2 mm × 2 mm UDFN package (MT suffix) with an exposed thermal pad (EP). The EP must be soldered to AGND using ≥6 thermal vias and connected to a solid ground plane. Thermal resistance is θJA = 90°C/W; for 125°C operation at 1W dissipation, ambient must remain ≤35°C unless enhanced cooling is implemented per Figure 7-3.