Analog Devices Inc./Maxim Integrated MAX22208ATU+T

Overview

The MAX22208ATU+T from Analog Devices is a quad half H-bridge motor driver IC with integrated non-dissipative current sensing, rated for 65V operation and 3.8A peak per channel. It delivers four independently controllable drivers optimized for brushed DC motors, solenoids, and stepper motor phases, featuring 0.3Ω typical total R_ON, thermal shutdown at +155°C, and active-low open-drain FAULT reporting.

For engineers reviewing the MAX22208ATU+T datasheet, MAX22208ATU+T pinout, MAX22208ATU+T application, or MAX22208ATU+T equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping to 38-pin TQFN (5mm × 7mm), and real-world design implications of its integrated current sense scaling factor (K_ISEN = 7500 A/A) and OCP blanking time (2.2–3.5 μs).

Technical Context

The MAX22208ATU+T implements four independent gate drivers with charge-pump high-side FET control (VCP, CP1, CP2), enabling full half-bridge operation from a single VM rail (4.5V–65V). Each channel uses dedicated DIN_ and EN_ logic inputs with truth-table-defined behavior: EN_=0 forces high-impedance output, while EN_=1 enables PWM-controlled high-side (DIN_=1) or low-side (DIN_=0) conduction.

Its integrated current sensing operates unipolar on the low-side FET only, sourcing I_ISEN = I_OUT/K_ISEN (K_ISEN = 7500 A/A) to ISEN1–ISEN4 pins-requiring external resistors to generate ADC-compatible voltage signals. Fault protection includes per-channel overcurrent detection (3.8A min threshold), UVLO (4.0V typ), and thermal shutdown with 20°C hysteresis.

Key Specifications

Pinout & Package

The MAX22208ATU+T is packaged in a 38-pin TQFN (5mm × 7mm) with exposed pad (EP), optimized for thermal dissipation on multilayer PCBs. Pin functions are validated per Analog Devices' official pin description table and TQFN top-view layout.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quad half-bridge driver applications.

Compared with DRV8876PWPR and MP6612GQ-Z, the MAX22208ATU+T uniquely combines 65V capability, per-channel current monitoring without external components, and fault-isolated channel control - making it the only option for high-voltage, multi-actuator systems demanding embedded diagnostics.

Availability

The MAX22208ATU+T is available at Aetrix Electronics and suitable for industrial automation, agricultural hydraulics, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for MAX22208ATU+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 MAX22208ATU+T belongs to Analog Devices' robust motor driver product line, engineered for high-voltage, high-reliability motion control in harsh environments - emphasizing integrated protection, current visibility, and minimal external component count.

FAQ

What is the maximum continuous current per half-bridge for MAX22208ATU+T under typical PCB conditions?

The MAX22208ATU+T supports 2A RMS per half-bridge under standard thermal conditions (four-layer board, 2oz copper, moderate airflow). This value scales with PCB thermal design: with enhanced heatsinking or forced air, sustained current may reach 2.5A, but must remain below the 3.8A OCP threshold. The device's 28°C/W θ_JA (four-layer board) means 2A operation at 24V generates ~2.4W dissipation, raising junction temperature by ~67°C above ambient - well within the +125°C max operating range.

How does the integrated current sensing in MAX22208ATU+T differ from traditional shunt-based methods?

The MAX22208ATU+T uses patented non-dissipative current mirroring on the low-side FET, eliminating power loss and board space consumed by external shunt resistors. Unlike shunts that dissipate watts at high current, the MAX22208ATU+T's ISEN output sources only microamps (e.g., 266μA at 2A load), enabling direct ADC interfacing with no amplification needed. This architecture avoids shunt tolerance drift, thermal EMF errors, and PCB layout sensitivity - delivering stable ±3% current measurement accuracy across temperature.

Can MAX22208ATU+T drive a bipolar stepper motor in full-bridge mode?

Yes - the MAX22208ATU+T can configure two half-bridges per phase to drive a bipolar stepper motor. For example, OUT1/OUT2 control Phase A (with ISEN1/ISEN2 monitoring), and OUT3/OUT4 control Phase B. Its 65V rating supports high-inductance windings, and per-channel OCP protects against phase shorts. However, microstepping requires external PWM generation on DIN_/EN_ inputs, as the MAX22208ATU+T lacks internal indexer logic - unlike dedicated stepper drivers such as the MAX22213.

What happens to the outputs of MAX22208ATU+T during undervoltage lockout (UVLO)?

When VM drops below the UVLO threshold (4.0V typ), all four OUT_ pins enter high-impedance (three-state) mode immediately, and the FAULT pin is driven low. This prevents erratic switching or partial turn-on of external loads during brownout conditions. Normal operation resumes automatically once VM rises above the UVLO hysteresis level (0.12V), at which point FAULT goes high and outputs respond to current DIN_/EN_ states - ensuring safe, predictable recovery without MCU intervention.

Is the MAX22208ATU+T pin-compatible with other devices in the MAX222xx family?

No - the MAX22208ATU+T has a unique 38-pin TQFN footprint and pinout not shared with other MAX222xx variants (e.g., MAX22200, MAX22204). While functional similarities exist (e.g., integrated current sense, OCP), pin assignments for ISEN_, EN_, DIN_, and charge-pump terminals differ significantly. Migration requires PCB redesign; however, the MAX22208ATU+T's pinout is identical to the MAX22208ATU+ (same package, tape-and-reel vs. tray), enabling drop-in replacement within the same ordering variant.