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Analog Devices Inc. MAX22210 Stepper Motor Driver integrates two 36V, 3.8AMAX H-bridges. The H-bridge FETs have a very low impedance, resulting in high driving efficiency and minimal heat generated. The typical total RON (high side + low side) is 0.25Ω. The MAX22210 integrates an accurate, current drive regulation circuit and a 128-micro step built-in indexer controlled by a STEP/DIR interface. The high micro-stepping resolution and advanced control technique ensure smooth and quiet operation.
The current flowing into the two low-side FETs is sensed by a nondissipative integrated current sensing (ICS), and it is then compared with the desired step threshold current. When the bridge current exceeds the setpoint (ITRIP), the device enforces decay for a fixed OFF time (TOFF). Three decay modes are supported: slow, mixed, and adaptive. The nondissipative integrated current sensing eliminates the bulky external power resistors usually required for this function, resulting in dramatic space and power saving compared with mainstream applications based on external sense resistors.
The internally sensed phase currents are mirrored on two pins (ISENA, ISENB) to allow the external controller to monitor the currents and use this information for diagnostic purposes. The maximum output current per H-bridge is IMAX = 3.8AMAX, which is limited by overcurrent protection (OCP). The maximum RMS current per H-bridge is IRMS = 2ARMS at room temperature, assuming a 4-layer PCB. Since thermal considerations limit this current, the actual maximum RMS current depends on the thermal characteristics of the application, such as PCB ground planes, heatsinks, ventilation, etc.
The Analog Devices Inc. MAX22210 features overcurrent protection, thermal shutdown (TSD), and undervoltage lockout (UVLO). An open-drain, active-low FAULT pin is activated whenever a fault condition is detected. During thermal shutdown and UVLO events, the driver is disabled until normal operations are restored. The MAX22210 is available in small, 5mm x 5mm TQFN32 and 4.4mm x 9.7mm TSSOP28 packages.
