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.

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

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