General Description
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 3.2AFS per half-bridge, whereas
the MAX22217 is capable of up to 1AFS 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 halfbridge
output voltage is controlled. Supply variations are
internally compensated.
In current drive regulation mode (CDR mode), the halfbridge
output current is controlled. The current is internally
sensed and fed back to the controller for accurate closedloop
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

Benefits and Features
● Four Serial Controlled 36V Half Bridges
• 1.7A DC (TA = 25°C) and 3.2A Full-Scale Current
Capability (MAX22216)
• 0.55A DC (TA = 25°C) and 1A Full-Scale Current
Capability (MAX22217)
● Low RON for High Efficiency
● High Flexibility:
• Independent Channel Setting
• High-Side/Low-Side/Bridge-Tied Load
Configuration/Parallel Mode Supported
● Advanced Control Methods
• Voltage/Current Drive Regulation
• Two Levels Sequencer for Power Saving
• DC-Motor Drive with Current Limiter
• Dithering Function
• Ramp up/down Control
• Demagnetization Voltage Control
• Integrated Current Sense
● Diagnostic Functions:
• Reaction and Travel Time Measurement
• Detection of Plunger Movements
• Open-Load Detection
• Inductance Measurement
• Digital Current Sense Monitor
● Full Set of Protections
• Overcurrent Protection
• Thermal Protections
• Undervoltage Lockout