Microchip Technology MCP16418T-I/MN

Overview

MCP16418T-I/MN from Microchip Technology is a synchronous boost DC-DC converter with automatic input-to-output bypass mode, designed for battery-powered systems requiring high efficiency across wide input voltage ranges. It supports 0.8V–5.25V input, delivers up to 5.0V output at >450 mA (3.6V_IN), achieves 96% peak efficiency, and features 5 μA quiescent current in PFM mode-enabling long runtime in single-cell Li-ion or two-cell alkaline/NiMH IoT sensors and Bluetooth headsets.

For engineers reviewing the MCP16418T-I/MN datasheet, MCP16418T-I/MN pinout, MCP16418T-I/MN application, or MCP16418T-I/MN equivalent, key selection criteria include its auto-bypass operation at V_IN ≥ V_OUT, selectable PWM-only switching at 500 kHz, programmable UVLO/LBO, and dual-package availability in MSOP-10 and 3 mm × 3 mm TDFN.

Technical Context

The MCP16418T-I/MN implements a synchronous rectified boost topology with internal compensation and integrated MOSFETs, eliminating external loop compensation components. Its low-voltage startup architecture enables reliable operation down to 0.8V post-startup, while the auto-bypass function engages when V_IN ≥ V_OUT − 100 mV, reducing conduction loss and improving system-level efficiency in fading battery conditions.

It operates in fixed-frequency PWM mode (500 kHz) without PFM transition-distinguishing it from MCP16411/3/5/7 variants-and includes dedicated EN, FB, LBO, and UVLO pins for precise system-level power sequencing and battery monitoring in compact portable devices.

Key Specifications

Pinout & Package

Package: 10-lead MSOP (3.0 mm × 4.9 mm) and 10-lead 3 mm × 3 mm TDFN - both RoHS-compliant, thermally enhanced, and suitable for automated SMT assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS61291DRVR and MAX17222ELT+T, the MCP16418T-I/MN uniquely combines fixed 500 kHz PWM, auto-bypass, and sub-μA shutdown to maximize runtime across the full battery discharge curve-especially critical in two-cell alkaline and fading Li-ion applications where V_IN crosses V_OUT.

Availability

MCP16418T-I/MN is available at Aetrix Electronics and suitable for wearable health monitors, Bluetooth® headsets, and smart remote controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MCP16418T-I/MN 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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and power management ICs, with broad industrial, automotive, and consumer design-in support.

The MCP1641X family-including MCP16418T-I/MN-is engineered for ultra-low-power, battery-centric applications where dynamic input voltage tracking and minimal quiescent consumption are essential to extending operational life.

FAQ

What is the minimum input voltage required for MCP16418T-I/MN to start up?

The MCP16418T-I/MN starts up from an input voltage as low as 0.8V after initial startup, enabled by its low-voltage architecture. This allows operation with deeply discharged single-cell NiMH or alkaline batteries. The actual startup threshold is set by the UVLO pin resistor divider, but the internal circuitry guarantees reliable initiation even below 1.0V, making MCP16418T-I/MN suitable for energy-harvesting-adjacent applications where source voltage is marginal.

Does MCP16418T-I/MN require external compensation components?

No, MCP16418T-I/MN integrates full internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This reduces bill-of-materials count, saves PCB area, and improves design robustness-particularly valuable in compact personal electronics such as Bluetooth headsets and portable medical sensors where layout space is constrained and reliability under vibration or thermal cycling is critical.

What is the purpose of the PGT pin on MCP16418T-I/MN?

PGT (Power Good) is an open-drain output on MCP16418T-I/MN that asserts high when VOUT is within ±5% of its nominal 5.0V regulation. It provides a hardware signal for system-level power sequencing-e.g., enabling a microcontroller only after stable 5V is established-or triggering fault logging in portable instruments. Unlike enable or LBO, PGT reflects real-time output regulation status, not input conditions or shutdown state.

Can MCP16418T-I/MN operate without an inductor?

No, MCP16418T-I/MN requires an external power inductor (typically 1–2.2 μH) connected between SW and VIN to perform boost conversion. The auto-bypass mode does not eliminate the inductor-it simply routes VIN directly to VOUT when input voltage exceeds output minus margin. During boost operation, the inductor stores and transfers energy; omitting it will prevent regulation and likely damage the IC due to uncontrolled current flow through internal switches.

How does the auto-bypass feature improve battery utilization in MCP16418T-I/MN?

The auto-bypass feature in MCP16418T-I/MN engages when VIN ≥ VOUT − 100 mV, routing input directly to output with only ~100 mV dropout across internal MOSFETs. This avoids switching losses inherent in boost mode, increasing system efficiency by up to 8% at mid-to-low battery voltages-e.g., extending usable runtime in a two-cell alkaline remote from 120 to >140 hours. It is a key differentiator versus fixed-frequency-only boost converters like MCP16418T-I/MN's sibling MCP16412.