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65V, 3.8A Stepper Motor Driver with Integrated
Current-Sense and 128 Usteps Indexer
MAX22204
General Description
Applications
The MAX22204 is a two-phase stepper motor driver. It
● Stepper Motor Driver
integrates two 65V, 3.8A H-Bridges. The H-Bridge
MAX
FETs have very low impedance, resulting in high driving
Benefits and Features
● Two H-Bridges with +65V Voltage Rating
efficiency and minimal heat. The typical total R (high-
ON
side + low-side) is 0.3Ω. The MAX22204 integrates an ac-
curate current drive regulation circuit and a 128-microstep
built-in indexer controlled by a STEP/DIR interface. The
high microstep resolution and advanced control technique
ensure smooth and quiet operations.
• Total Rdson (High-Side + Low-Side): 300mΩ
Typical (T = 25°C)
A
● Current Ratings per H-Bridge (Typical at T = 25°C):
A
• I
= 3.8A
(Impulsive Current for Driving
MAX
MAX
Capacitive Loads)
• I = 2.8A (Maximum Full Scale Current
The current flowing into the two low-side FETs is sensed
by a non-dissipative Integrated Current Sensing (ICS) and
it is then compared with the desired step threshold current.
As soon as the bridge current exceeds the threshold
FS(MAX)
Setting for Internal Current Drive Regulation)
• I = 2A per Phase (T = 25°C, V = +24V)
RMS
RMS
A
M
(I
(t
), the device enforces the decay for a fixed OFF-time
).
● Integrated Current Control
TRIP
OFF
• Full-Scale DAC Current Configurable with External
Resistance
• One Logic Input (TRQ) to Quickly Change the
Torque among Two Levels
• Internal Current Sensing (ICS) Eliminates External
Bulky Resistors and Improves Efficiency
• Built-in-Control with 128-usteps Indexer
• STEP/DIR Interface
• Integrated DAC and Sequencer for U-Stepping
• Multiple Decay Modes (Slow, Mixed, Adaptive)
• Fixed OFF Time Configurable with External
Resistance
The non-dissipative ICS eliminates the bulky external
power resistors normally required for this function, result-
ing in a dramatic space and power saving compared with
mainstream applications based on the external sense re-
sistor. Currents proportional to the internally-sensed
bridge currents are output to pins ISENA and ISENB. By
connecting external resistors to these pins, voltages pro-
portional to the bridge currents are generated. These can
be used for diagnostic purposes.
The maximum output current per H-Bridge is I
3.8A
device delivers up to 2A
T = 25°C with proper PCB ground plane for thermal dis-
sipation. The current capability depends on the PCB ther-
mal characteristic (PCB ground planes, heatsinks, ventila-
tion, etc.)
=
MAX
limited by the Overcurrent Protection (OCP). The
MAX
● Current-Sense Output (ISENA, ISENB) Current
Monitor
● Fault Indicator Pin (FAULT)
● Protections
per phase at V = +24V and
RMS
M
A
• Overcurrent Protection for each Individual Channel
(OCP)
• Undervoltage Lockout (UVLO)
The maximum full-scale current per H-Bridge is I = 2.8A
FS
and can be set by an external resistor connected from the
REF pin to GND. This current is defined as the maximum
current setting of the integrated drive regulation circuit.
• Thermal Shutdown T = 155°C (TSD)
J
● TQFN38 5mm x 7mm Package (TSSOP38 4.4mm x
9.7mm Available in the Future)
One logic input (TRQ) allows to quickly change the current
setting among two different values for fast torque control.
The MAX22204 features Overcurrent Protection (OCP),
Thermal Shutdown (TSD), and Undervoltage Lockout
(UVLO). An open drain active low FAULT pin is activated
every time a fault condition is detected. During Thermal
Shutdown and Undervoltage Lockout, the driver is dis-
abled until normal operating conditions are restored.
The MAX22204 is packaged into a TQFN38 5mm x 7mm
package.
19-101089; Rev 0; 8/21
Ordering Information appears at end of data sheet.
© 2021 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.
One Analog Way, Wilmington, MA 01887 U.S.A. | Tel: 781.329.4700 | © 2021 Analog Devices, Inc. All rights reserved.
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