Microchip Technology MIC2877-AYFT-TR

Overview

MIC2877-AYFT-TR from Microchip Technology is a 2 MHz synchronous boost regulator with bidirectional true load disconnect, integrated 6.5A switch, and adjustable/fixed 4.75–5.5V output. It delivers up to 2A continuous output at VIN = 3.0V/VOUT = 5V, features ultra-fast transient response, and supports bypass mode when VIN ≥ VOUT - ideal for USB OTG host power and portable reserve supplies.

For engineers reviewing the MIC2877-AYFT-TR datasheet, MIC2877-AYFT-TR pinout, MIC2877-AYFT-TR application, or MIC2877-AYFT-TR equivalent, key selection criteria include input voltage range (2.5–5.5V), peak switch current limit (6.5A typ.), shutdown current (<2 µA), Power Good (PG) open-drain output, and FTQFN 2×2 mm package compatibility with high-density portable PCB layouts.

Technical Context

The MIC2877-AYFT-TR implements current-mode PWM control with internal slope compensation and a fixed 2 MHz oscillator. Its dual-MOSFET power stage includes an NMOS switch (6.5A peak limit, 45 mΩ R_DS(on)) and PMOS synchronous rectifier (33 mΩ), enabling bidirectional isolation during shutdown and automatic bypass mode when VIN ≥ VOUT.

It integrates anti-ringing switching to suppress SW-node EMI in DCM, programmable soft-start (1.1–2 ms), pre-charge current limiting (0.5A typ. at VOUT ≤ 0.5V), and overvoltage protection (6.6–6.75V latch-off). Feedback regulation uses a precise 0.9V reference (±1.5% over –40°C to +85°C) with 0.2%/A load regulation.

Key Specifications

Pinout & Package

Package: 8-pin FTQFN 2 × 2 mm, 0.5 mm pitch, exposed thermal pad (PGND-connected). RoHS-compliant, moisture sensitivity 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 MAX17222ETA+T, the MIC2877-AYFT-TR uniquely combines bidirectional disconnect, bypass mode, latch-off OVP, and PG signaling in a 2×2 mm QFN - making it the only option among the three qualified for USB OTG host certification and high-reliability portable reserve supplies.

Availability

MIC2877-AYFT-TR is available at Aetrix Electronics and suitable for USB OTG host power, portable reserve supplies, and high-current parallel lithium cell applications requiring stable component supply, long-term lifecycle support, and full traceability.

Supply support for MIC2877-AYFT-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 embedded system integration.

The MIC2877-AYFT-TR belongs to Microchip's high-efficiency, low-voltage DC-DC boost regulator product line, designed specifically for battery-powered portable electronics requiring robust protection, minimal footprint, and seamless USB/HDMI interoperability.

FAQ

What is the maximum continuous output current supported by the MIC2877-AYFT-TR?

The MIC2877-AYFT-TR delivers up to 2A continuous output current when VIN = 3.0V and VOUT = 5V, as specified in the datasheet under typical operating conditions. This rating assumes proper PCB thermal design with the exposed thermal pad soldered to a ≥100 mm² copper area and ambient temperature ≤+85°C. At lower input voltages (e.g., VIN = 2.5V), max output drops to 1.5A due to duty-cycle and switch-current limitations.

Does the MIC2877-AYFT-TR support automatic bypass mode, and how does it function?

Yes, the MIC2877-AYFT-TR automatically enters bypass mode when VIN ≥ VOUT. In this state, the NMOS switch turns off and the PMOS synchronous rectifier fully conducts, creating a low-impedance path (<50 mΩ) from input to output. This eliminates switching losses and associated EMI, improves efficiency at light-to-moderate loads, and enables seamless transition during input voltage transients - all without external control signals.

How does the bidirectional true load disconnect feature work in the MIC2877-AYFT-TR?

In the MIC2877-AYFT-TR, bidirectional true load disconnect is achieved by actively controlling both the NMOS main switch and PMOS synchronous rectifier during shutdown (EN = GND). The control circuit turns off the body diode of the PMOS, blocking reverse current flow from VOUT to VIN and forward leakage from VIN to VOUT. This prevents battery drain and protects upstream sources - a capability confirmed in Figure 2-23 and Figure 2-24 of the datasheet.

What are the key layout recommendations for the MIC2877-AYFT-TR to ensure stable operation?

For stable operation, route VIN–PGND and VOUT–PGND paths with wide, short copper pours; place the 22 µF input capacitor within 2 mm of VIN/PGND pins; locate the 1 µH inductor adjacent to SW and PGND; separate AGND and PGND with a single-point star connection near the IC; and keep the FB/VOUTS trace short and away from noisy nodes. These practices minimize voltage bounce, EMI, and thermal rise - directly referenced in Sections 4.3–4.5 and 6.1–6.4 of the MIC2877-AYFT-TR datasheet.

Can the MIC2877-AYFT-TR be used with adjustable output voltage, and what is the feedback reference voltage?

Yes, the MIC2877-AYFT-TR supports adjustable output voltage via the FB pin. Its internal reference voltage is 0.9V (typical), with a tolerance of ±1.5% over –40°C to +85°C. To set VOUT, use a resistor divider where R1 connects between VOUT and FB, and R2 connects between FB and PGND. The formula is VOUT = 0.9V × (1 + R1/R2), and total divider resistance should be ≤1 MΩ for accuracy - as defined in Equation 5-1 and Section 5.7 of the datasheet.