MAX22217

The MAX22216/MAX22217 integrate four programmable 36V half-bridges. It is primarily intended to drive inductive loads such as on-off solenoid valves, DC motors, proportional valves, bi-stable valves, relays, etc. The MAX22216 is capable of up to 3.2A_FS per half-bridge, whereas the MAX22217 is capable of up to 1A_FS per half-bridge. The MAX22216/MAX22217 operate from -40°C to +125°C ambient temperature.

The MAX22216/MAX22217 half-bridges support two different use cases. In the first case, configuration settings can be entered through a serial peripheral interface (SPI) and can be changed at any time. Alternatively, settings can be stored in one-time programmable (OTP) registers, which are loaded at power-up. This enables 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 mode (VDR mode), the half-bridge output voltage is controlled. Supply variations are internally compensated.

In current drive regulation mode (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/MAX22217 integrate functions aimed to optimize 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 detection (OL), and real-time current monitoring through a serial Interface.

The MAX22216/MAX22217 feature a full set of protection circuits, including overcurrent protection (OCP), overtemperature protection (OVT), and undervoltage lockout (UVM). A fault indicator pin is asserted whenever faults are detected.

The MAX22216/MAX22217 are offered in TQFN32 5mm x 5mm packages.

APPLICATIONS

• Solenoid On-Off Valves and Relays
• DC Motors
• Proportional Valves
• Bi-Stable Latching Solenoid Valves
• Switching Driver with Real-Time Current Measurement
• Digital Output Interface
• Electromechanical Motor Brake