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Analog Devices MAX22204 Stepper Motor Driver is a two-phase stepper motor driver. It integrates two 65V, 3.8AMAX H-bridges. The H-bridge FETs have very low impedance, resulting in high driving efficiency and minimal heat. The typical total RON (high-side + low-side) is 0.3Ω. The Analog Devices MAX22204 integrates an accurate, current drive regulation circuit and a 128-micro-step built-in indexer controlled by a STEP/DIR interface. The high micro-step resolution and advanced control technique ensure smooth and quiet operations.
The current flowing into the two low-side FETs is sensed by a non-dissipative Integrated Current Sensing (ICS), and it is then compared with the desired step threshold current. As soon as the bridge current exceeds the threshold (ITRIP), the device enforces the decay for a fixed OFF-time (tOFF).
The non-dissipative ICS eliminates the bulky external power resistors normally required for this function, resulting in a dramatic space and power-saving compared with mainstream applications based on the external sense resistor. Currents proportional to the internally-sensed bridge currents are output to pins ISENA and ISENB. By connecting external resistors to these pins, voltages proportional to the bridge currents are generated. These can be used for diagnostic purposes.
The maximum output current per H-bridge is IMAX = 3.8AMAX limited by the Overcurrent Protection (OCP). The device delivers up to 2ARMS per phase at VM = +24V and TA = 25°C with proper PCB ground plane for thermal dissipation. The current capability depends on the PCB thermal characteristic (PCB ground planes, heatsinks, ventilation, etc.)
The maximum full-scale current per H-bridge is IFS = 2.8A and can be set by an external resistor connected from the REF pin to GND. This current is defined as the maximum current setting of the integrated drive regulation circuit. One logic input (TRQ) allows the user to quickly change the current setting among two different values for fast torque control.
The Analog Devices MAX22204 features Overcurrent Protection (OCP), Thermal Shutdown (TSD), and Undervoltage Lockout (UVLO). An open-drain active-low FAULT pin is activated every time a fault condition is detected. During Thermal Shutdown and Undervoltage Lockout, the driver is disabled until normal operating conditions are restored. The MAX22204 is packaged into a TQFN38 5mm x 7mm package.
