Analog Devices Inc./Maxim Integrated MAX22212ATJ+T

Overview

MAX22212ATJ+T from Analog Devices is a 36V, 7.6A single H-bridge motor driver IC designed for brushed DC and stepper half-bridge control. It integrates low-R_ON FETs (0.125Ω typical total), non-dissipative current sensing, four decay modes, and programmable current regulation via 4-bit DAC and external REF/ROFF resistors. Used in compact industrial actuators requiring precise torque control and thermal efficiency.

For engineers reviewing the MAX22212ATJ+T datasheet, MAX22212ATJ+T pinout, MAX22212ATJ+T application, or MAX22212ATJ+T equivalent, this page delivers verified electrical specs, TQFN32 package mapping, real-world motor control use cases, and two validated alternative drivers with documented functional trade-offs.

Technical Context

The MAX22212ATJ+T implements a fully integrated high-side/low-side gate driver with charge-pump-based high-voltage level shifting (VCP output), enabling operation up to 36V VM while maintaining logic-level compatibility. Its internal current regulation loop uses a non-dissipative ICS architecture that eliminates external sense resistors and feeds back to a 4-bit sinusoidal DAC for ITRIP adjustment across 16 levels.

Four decay modes-Slow, Fast, and two Mixed-are selected via DECAY1/DECAY2 logic inputs, with fixed OFF-time (t_OFF) externally adjustable via ROFF resistor (15kΩ–120kΩ). The HFS pin toggles full-scale current range (7.6A/3.8A) and scales low-side R_ON inversely, optimizing accuracy at lower currents without sacrificing protection integrity.

Key Specifications

Pinout & Package

MAX22212ATJ+T is packaged in a 32-pin TQFN (5mm × 5mm, exposed pad), optimized for thermal performance (θ_JA = 29°C/W on 4-layer board) and space-constrained motor control modules.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar H-bridge motor driver applications.

Compared with TB9051FTG and DRV8876N, MAX22212ATJ+T uniquely combines DAC-based ITRIP programming, four hardware-selectable decay modes, and HFS-enabled low-end current accuracy - making it optimal for precision motion control where torque linearity and thermal efficiency are co-critical.

Availability

MAX22212ATJ+T is available at Aetrix Electronics and suitable for industrial linear actuators, medical infusion pumps, automotive HVAC dampers, and robotic joint actuators requiring stable component supply and long-term production continuity.

Supply support for MAX22212ATJ+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 since 1965.

The MAX22212ATJ+T belongs to Analog Devices' precision motor driver product line, engineered specifically for space- and thermally constrained applications demanding accurate current regulation, integrated sensing, and robust fault protection without external passive components.

FAQ

What is the maximum continuous RMS current supported by MAX22212ATJ+T on a standard PCB?

The recommended maximum RMS current for MAX22212ATJ+T is 4A RMS when mounted on a standard 4-layer PCB, based on thermal characterization (θ_JA = 29°C/W). This value accounts for steady-state power dissipation and ensures junction temperature remains below 125°C under worst-case ambient conditions. Exceeding 4A RMS requires enhanced thermal management such as copper pour expansion, thermal vias, or forced airflow.

How does the HFS pin affect current regulation accuracy in MAX22212ATJ+T?

When HFS = high, MAX22212ATJ+T halves its full-scale current range (from 7.6A to 3.8A) and doubles the low-side FET R_ON, which improves current regulation accuracy at lower output levels. Specifically, ITRIP accuracy tightens from ±10% (0.8A–1.4A, HFS=0) to ±5% (0.7A–1.5A, HFS=1), enabling precise torque control in low-power actuation scenarios like valve positioning or micro-pumps.

Can MAX22212ATJ+T drive a full bipolar stepper motor?

MAX22212ATJ+T drives one half of a bipolar stepper motor (i.e., one phase). To control a full 2-phase stepper, two MAX22212ATJ+T devices are required-one per phase-with coordinated decay mode and current regulation settings. Its dual-output pin structure (OUT1A/OUT1B and OUT2A/OUT2B) supports this configuration without external bridging.

What external components are mandatory for basic operation of MAX22212ATJ+T?

Mandatory external components for MAX22212ATJ+T include: (1) 1μF ceramic capacitor from VM to PGND, (2) 10μF bulk capacitor from VM to PGND, (3) 2.2μF capacitor from VDD to AGND, (4) 1μF capacitor between VCP and VM, and (5) 22nF capacitor between CP1 and CP2. REF and ROFF resistors are optional but required for current regulation and t_OFF configuration.

Does MAX22212ATJ+T support PWM control without using the internal current regulation loop?

Yes. When bridge current remains below the ITRIP threshold, MAX22212ATJ+T operates in direct PWM mode controlled solely by DIN1/DIN2/EN logic inputs (per Truth Table 1). The current regulation loop activates only during overcurrent events - it does not interfere with normal PWM operation, allowing seamless transition between open-loop speed control and closed-loop torque limiting.