Analog Devices Inc./Maxim Integrated MAX22203ATU+T

Overview

MAX22203ATU+T from Analog Devices is a dual 65V, 3.8A peak H-bridge motor driver IC with integrated current-sense and programmable current drive regulation (CDR), designed for brushed DC or single stepper motor control in industrial actuators and precision motion systems. It delivers 2ARMS per bridge on JEDEC 4-layer PCBs, features 0.3Ω typical total R_ON, and supports independent PWM control of each bridge via DIN1/DIN2/EN inputs.

For engineers reviewing the MAX22203ATU+T datasheet, MAX22203ATU+T pinout, MAX22203ATU+T application, or MAX22203ATU+T equivalent, this page provides verified technical context, validated pin functions, confirmed thermal and current ratings, and real-world motor-drive use cases - all grounded in Analog Devices' official documentation and electrical characteristics.

Technical Context

The MAX22203ATU+T implements two independent high-voltage H-bridges with charge-pump gate drivers enabling 65V VM operation and 0.3Ω typical combined R_ON. Each bridge supports three decay modes (slow/mixed/fast) controlled by DECAY1/DECAY2 pins and uses non-dissipative integrated current sensing (ICS) to eliminate external shunt resistors.

Current regulation is implemented via configurable ITRIP thresholds (up to 3A per bridge) set by external resistors on REFA/REFB, with fixed OFF-time (t_OFF) adjustable via ROFF. Fault conditions - including OCP (3.8A trip), TSD at +155°C, and UVLO at 4.0V - trigger an open-drain FAULT pin and force tristate output recovery.

Key Specifications

Pinout & Package

Packaged in a 38-pin TQFN (5mm × 7mm, exposed pad), the MAX22203ATU+T integrates dual H-bridge power stages, analog current-sense interfaces, and logic-level control with dedicated ground separation (AGND/PGND) for noise immunity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB9051FTG and DRV8876PWPR, the MAX22203ATU+T uniquely combines dual 65V bridges, integrated CDR, and non-dissipative current sensing in one package - reducing system-level complexity, footprint, and thermal coupling while enabling precise current-controlled motion in space-constrained industrial designs.

Availability

MAX22203ATU+T is available at Aetrix Electronics and suitable for industrial automation, medical device motion control, and precision instrumentation requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for MAX22203ATU+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 technologies, serving industrial, automotive, communications, and healthcare markets since 1965.

The MAX22203 belongs to Analog Devices' high-voltage motor driver product line, engineered specifically for compact, thermally efficient motion control in space- and power-constrained industrial and medical equipment.

FAQ

What is the maximum continuous current the MAX22203ATU+T can deliver per H-bridge?

The MAX22203ATU+T supports 2ARMS per H-bridge on a standard JEDEC 4-layer PCB. This RMS rating assumes adequate thermal design - including proper PGND copper pour, exposed pad soldering, and ambient temperature ≤+85°C. Exceeding 2ARMS continuously risks thermal shutdown activation unless enhanced cooling (e.g., heatsink or forced air) is implemented. The 3.8A IMAX rating applies only to short transients, not sustained operation.

How do I configure the current regulation threshold (ITRIP) for Bridge A using the MAX22203ATU+T?

To configure ITRIP for Bridge A, connect a resistor R_REF between REFA pin and AGND. The threshold follows ITRIP = 0.9V / R_REF, where R_REF must be 12kΩ–72kΩ to achieve 12.5mA–75mA reference current and yield ITRIP = 0.5A–3A. For example, a 300kΩ resistor sets ITRIP ≈ 3A. The MAX22203ATU+T datasheet Table "REF_ Pin Resistor Range" and Figure "Setting the Current Regulation Threshold" confirm this linear relationship.

Does the MAX22203ATU+T support fast decay mode, and how is it enabled?

Yes, the MAX22203ATU+T supports fast decay mode for both bridges. It is selected by driving the DECAY1 and DECAY2 pins to logic high (per Truth Table 2). In fast decay, the H-bridge actively reverses polarity during the OFF period to rapidly collapse winding current - useful for high-speed stepper applications requiring minimal torque ripple. Slow decay (DECAY = low) is default and recommended for brushed DC to reduce EMI and improve efficiency.

Can the MAX22203ATU+T drive a unipolar stepper motor?

No, the MAX22203ATU+T is designed exclusively for bipolar stepper motors or dual brushed DC motors. Its dual full-bridge topology provides four quadrant control (±V, ±I) required for bipolar phase excitation. Unipolar steppers require center-tapped windings and half-bridge switching - incompatible with the MAX22203ATU+T's output architecture and current-sense methodology. Using it with unipolar motors would result in incorrect commutation and potential damage.

What is the purpose of the CDRA and CDRB pins on the MAX22203ATU+T?

CDRA and CDRB are open-drain outputs that assert low whenever the internal current drive regulation (CDR) circuit activates - i.e., when bridge current exceeds the ITRIP threshold and fixed OFF-time decay begins. These pins allow external controllers to monitor CDR activity in real time without polling or interrupt latency. For the MAX22203ATU+T, they provide visibility into current-loop behavior for diagnostics, adaptive timing adjustment, or safety validation in certified motion systems.