MAX22216 Serial-Controlled Solenoid and Motor Driver

ADI's MAX22216 integrates four programmable 36 V half-bridges. It is primarily intended to drive inductive loads such as on-off solenoid valves, DC motors, proportional valves, bistable valves, relays, and more. The MAX22216 is capable of up to 3.2 A_FS per half-bridge.

The MAX22216 half-bridges support two different use cases. In the first case, configuration settings can be entered through a serial peripheral interface (SPI) and changed at any time. Alternatively, settings can be stored in one-time programmable (OTP) registers, loaded at power-up, enabling stand-alone operations. Registers are user-programmable. The OTP writing procedure must be executed in a factory under well-controlled temperature and voltage conditions.

High-side/low-side single-ended drive operations and bridge-tied load (BTL) configurations are supported. Channel parallelization is also supported. Voltage control, current control, and mixed schemes are supported.

In voltage drive regulation (VDR) mode, the half-bridge output voltage is controlled. Supply variations are internally compensated. In current drive regulation CDR mode, the half-bridge output current is controlled. The current is internally sensed and fed back to the controller for accurate closed-loop regulation. Proportional and integral gains can be configured to optimize steady-state errors and dynamic performance.

The MAX22216 integrates functions aimed at optimizing solenoid and DC motor drive control. These include a two-level sequencer for power saving, drive signal ramp control (RAMP) for noise reduction, a dither function (DITH) to counteract the effects of static friction and hysteresis, a fast demagnetization feature (DC_H2L) to shorten on-off cycles, and a DC motor current limiter for limiting inrush and stall currents.

Advanced diagnostic functions are available to improve system reliability and enable predictive maintenance. These include the detection of plunger movement (DPM), inductance measurement, travel time measurement, open-load (OL) detection, and real-time current monitoring through a serial interface.

The MAX22216 features a full set of protection circuits, including overcurrent protection (OCP), overtemperature protection (OTP), and undervoltage lockout (UVLO). A fault indicator pin is asserted whenever faults are detected.

The MAX22216-EVAL allows evaluation of the MAX22216 in combination with the TRINAMIC evaluation board system or as a stand-alone board. It uses the standard schematic and offers several options to test different modes of operation.