Analog Devices Inc./Maxim Integrated MAX22212ATJ+

Overview

MAX22212ATJ+ from Analog Devices is a 36V, 7.6A single H-bridge motor driver IC with integrated non-dissipative current sensing, programmable current regulation (ITRIP), and four decay modes (Slow, Fast, Mixed1, Mixed2). It drives brushed DC motors or one half of a stepper motor, delivering 0.125Ω typical total R_ON and supporting PWM control via DIN1/DIN2/EN inputs in industrial motion control systems.

For engineers reviewing the MAX22212ATJ+ datasheet, MAX22212ATJ+ pinout, MAX22212ATJ+ application, or MAX22212ATJ+ equivalent, key selection considerations include its 4ARMS recommended max current on 4-layer PCB, HFS pin-enabled 50% full-scale mode for improved low-end accuracy, integrated 4-bit sinusoidal DAC for ITRIP adjustment, and open-drain CDR/FAULT outputs for real-time current loop and fault monitoring.

Technical Context

The MAX22212ATJ+ implements a fully integrated high-side + low-side FET H-bridge with charge-pump gate drive (VCP, CP1, CP2) enabling operation up to 36V VM. Its current regulation uses internal non-dissipative sensing (ICS) compared against a DAC-set ITRIP threshold, triggering fixed t_OFF-based decay control - not external resistor-based sensing.

It supports dynamic current scaling via 4-bit ISET[4:1] logic inputs and configurable full-scale current (IFS) using an external REF-to-GND resistor. The HFS pin toggles between 100% (7.6A max) and 50% (3.8A max) IFS ranges while doubling low-side R_ON to improve regulation accuracy below 1.1A.

Key Specifications

Pinout & Package

MAX22212ATJ+ is packaged in a 32-pin TQFN (5mm × 5mm, package code T3255-8C) with exposed thermal pad (EP) tied to PGND. Pin functions are validated per Analog Devices' official pin configuration diagram (TQFN top view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with DRV8876PWPR and TB9051FTG, MAX22212ATJ+ uniquely combines 7.6A peak rating, non-dissipative current sensing, HFS-selectable accuracy scaling, and 5mm × 5mm TQFN packaging - making it optimal for compact, thermally demanding industrial motion subsystems where component count and layout area are critical.

Availability

MAX22212ATJ+ is available at Aetrix Electronics and suitable for brushed DC motor control, stepper half-bridge drive, and solenoid actuation requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX22212ATJ+ 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+ belongs to Analog Devices' precision motor driver product line, designed specifically for space- and thermal-constrained industrial motion systems requiring integrated current regulation, minimal external components, and robust fault protection.

FAQ

What is the maximum continuous current rating for MAX22212ATJ+ on a standard PCB?

The MAX22212ATJ+ recommends a maximum 4A RMS continuous current on a standard 4-layer PCB due to thermal limits. While its overcurrent protection triggers at 7.6A peak, sustained operation above 4A RMS requires enhanced thermal management - such as thicker copper, thermal vias under the EP pad, or forced airflow - to maintain junction temperature below 165°C.

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

When HFS = high, the MAX22212ATJ+ halves its full-scale current range (to 3.8A max) and doubles low-side R_ON, improving current regulation accuracy to ±5% down to 0.5A output. This mode is ideal for applications requiring precise low-current control, such as microstepping or soft-start in sensitive valve actuators.

Can MAX22212ATJ+ drive a full bipolar stepper motor independently?

No - the MAX22212ATJ+ integrates only one H-bridge and is designed to drive either a single brushed DC motor or one half (one phase) of a bipolar stepper motor. To drive a full 2-phase stepper, two MAX22212ATJ+ devices are required - one per phase - with coordinated ISET and decay mode configuration.

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

Mandatory external components for MAX22212ATJ+ include: (1) 1μF + 10μF VM bypass capacitors, (2) 2.2μF VDD bypass capacitor, (3) 1μF VCP-to-VM capacitor, (4) 22nF CP1-to-CP2 flying capacitor, (5) pull-up resistors on FAULT and CDR, and (6) REF-to-GND resistor to set IFS. No external current sense resistor is needed due to integrated ICS.

Does MAX22212ATJ+ support PWM frequency modulation, and what is its maximum switching frequency?

The MAX22212ATJ+ accepts logic-level PWM inputs (DIN1/DIN2) with no internal clock limitation; its maximum effective switching frequency is constrained by gate drive strength and external FET characteristics. With typical 0.125Ω R_ON and 200V/μs slew rate, it supports clean PWM operation up to 100kHz - verified in Analog Devices' EV kit testing with 24V/5A loads.