Analog Devices Inc./Maxim Integrated MAX42410AFOB+T

Overview

MAX42410AFOB+T from Analog Devices is a fully integrated 36V, 10A synchronous buck converter with internal high-side and low-side MOSFETs, 1.5MHz fixed switching frequency, 0.8V–6V programmable output voltage, 36ns minimum on-time, and dual-phase capability supporting up to 20A. It delivers high efficiency (93.9% at 12V_IN/3.3V_OUT) in industrial point-of-load power supplies.

For engineers reviewing the MAX42410AFOB+T datasheet, MAX42410AFOB+T pinout, MAX42410AFOB+T application, or MAX42410AFOB+T equivalent, key selection considerations include its 10A current rating, 1.5MHz/400kHz frequency optioning via part number, 10μA quiescent current in skip mode, thermal shutdown at 175°C, and FC2QFN-17 package with symmetric SUP/PGND layout for EMI control.

Technical Context

The MAX42410AFOB+T implements average current-mode control with 36ns minimum on-time, enabling large input-to-output voltage step-down ratios without pulse-skipping instability. Its dual-phase architecture uses VEA node coupling and SYNCOUT-to-SYNC interconnection to achieve dynamic current sharing and precise 180° out-of-phase operation between controller and target ICs.

It integrates a 1.8V BIAS linear regulator with 2.2μF output capacitor requirement, supports forced PWM or skip-mode via SYNC pin logic level, and features cycle-by-cycle overcurrent protection with hiccup-mode short-circuit recovery. The PGOOD output asserts low during soft-start and transitions to high-impedance when V_OUT exceeds 94% of regulation.

Key Specifications

Pinout & Package

MAX42410AFOB+T is housed in a thermally enhanced 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed PGND paddle for low θ_JA (27°C/W on 4-layer board) and symmetric SUP/PGND pin placement to minimize high-current loop area and EMI.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-current buck converter applications.

Compared with MAX42410AFOA+T, the MAX42410AFOB+T trades wider output voltage range (10V) and lower EMI for smaller magnetics and tighter layout; versus MPM3695-10, it provides guaranteed industrial temperature operation, dual-phase coordination, and superior PGOOD accuracy-making it the only choice for mission-critical industrial power rails.

Availability

MAX42410AFOB+T is available at Aetrix Electronics and suitable for industrial automation, distributed DC power systems, and point-of-load applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for MAX42410AFOB+T 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

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets with precision power, signal chain, and RF solutions.

The MAX42408/MAX42410 product line was designed specifically for high-density, high-reliability industrial point-of-load conversion-emphasizing wide input range, dual-phase scalability, ultra-low IQ, and robust protection in compact FC2QFN packages.

FAQ

What is the maximum output current rating of the MAX42410AFOB+T?

The MAX42410AFOB+T is rated for 10A continuous output current per phase. This rating is validated across the full operating temperature range (-40°C to +125°C) and input voltage range (4.5V to 36V), with thermal derating applied above +70°C ambient per the datasheet's θ_JA specification. In dual-phase configurations using two MAX42410AFOB+T ICs, total output current scales to 20A with dynamic current sharing.

Does the MAX42410AFOB+T support adjustable output voltage, and what is the range?

Yes, the MAX42410AFOB+T supports programmable output voltage via an external resistor divider connected to the FB pin. For the MAX42410AFOB+T variant (1.5MHz version), the output voltage range is 0.8V to 6V. This limitation arises from stability constraints at higher frequencies; the 400kHz variant (MAX42410AFOA+T) supports up to 10V. The internal 0.8V reference ensures ±1.5% regulation accuracy over line, load, and temperature.

How does the SYNC pin function on the MAX42410AFOB+T?

The SYNC pin on the MAX42410AFOB+T serves three distinct functions: pulling it high enables forced PWM mode at 1.5MHz; pulling it low activates skip mode for ultra-low 10μA quiescent current; applying an external clock signal synchronizes switching to that frequency (1.215–1.845MHz). This single-pin configurability eliminates external mode-select logic and simplifies design across varying efficiency and EMI requirements.

What package type and thermal characteristics does the MAX42410AFOB+T use?

The MAX42410AFOB+T uses a 3.5mm × 3.75mm, 17-pin FC2QFN package with exposed thermal pad. On a standard 4-layer evaluation board, its junction-to-ambient thermal resistance (θ_JA) is 27°C/W, and junction-to-case (θ_JC) is 8.5°C/W. The symmetric SUP/PGND pin layout and exposed paddle enable efficient heat transfer to the PCB ground plane, supporting 10A operation without external heatsinks under typical industrial airflow conditions.

Can the MAX42410AFOB+T operate in dropout mode, and what is the maximum duty cycle?

Yes, the MAX42410AFOB+T supports dropout operation with a maximum duty cycle of 96%. This allows regulation even when input voltage approaches output voltage-for example, delivering 3.3V from a 3.6V input rail. The 36ns minimum on-time ensures stable operation at very low duty cycles (e.g., 3.3V/36V ≈ 9.2%), enabling high step-down ratio applications without pulse-skipping artifacts or regulation loss.