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36V, 3.8A Two H-Bridge for Dual Brushed or
Single Stepper Motor Drive
MAX22211
General Description
The MAX22211 is a dual 36V, 3.8A
The MAX22211 is available in a small TQFN32 5mm x
5mm package or a TSSOP28 4.4mm x 9.7mm package.
H-bridge. It can
MAX
be used to drive two brushed DC motors or a single step-
per motor. The H-bridge FETs have very low impedance
resulting in high driving efficiency and low heat generation.
Applications
● Stepper-Motor Driver
● Brushed DC Motor Driver
● Solenoid Driver
The typical total R
(high-side + low-side) is 0.25Ω.
ON
Each H-bridge can be individually pulse-width modulation
(PWM)-controlled using three logic inputs (DIN1, DIN2,
EN).
● Latched Valves
The MAX22211 features an accurate current drive regula-
tion (CDR) which can be used to limit the start-up current
of a brushed DC motor or to control the phase current for
stepper operation. The bridge output current is sensed by
a non-dissipative integrated current sensing (ICS) and it
Benefits and Features
● Two H-Bridges with +36V Maximum Operating
Voltage
• Total R
(High-Side + Low-Side): 250mΩ Typical
ON
(T = 25°C)
A
is then compared with user configurable threshold (I
).
TRIP
● Current Ratings per H-Bridge (Typical at T = 25°C)
A
When the bridge current exceeds the I
threshold, the
TRIP
• I
= 3.8A (Maximum Current Setting for
device enforces the decay for a fixed OFF-time (t
).
TRIP_MAX
OFF
Internal Current Drive Regulation)
Four different Decay methods are supported (Slow Decay,
Fast Decay, and two Mixed Decay modes). The non-dissi-
pative ICS eliminates bulky external power resistors which
are normally required for this function resulting in a dra-
matic space and power saving compared with mainstream
applications using external sense resistors.
• I = 2A (Recommended Maximum RMS
RMS
RMS
Current per Full Bridge)
● Integrated Current Drive Regulation
• ICS Eliminates Bulky External Resistors and
Improves Efficiency
• Current Drive Regulation Monitor Output Pins
(CDRA, CDRB)
• Four Decay Modes Supported (Slow Decay, Fast
Decay, and two Mixed Decays)
• Half Full Scale (HFS) Pin to Improve Current
Control Accuracy in the Low Current Range
The internally measured current of the two full bridges are
mirrored on pins ISENA and ISENB. By connecting exter-
nal resistors to these pins to GND, voltages proportional
to the motor currents are generated. The voltage across
these external resistors can be used as inputs to analog-
to-digital converters (ADCs) of an external motor controller
if the motion control algorithm requires the load current or
torque information.
● Current Sense Output (Current Monitor)
● Fault Indicator Pin (FAULT)
● Low-Power Mode (Sleep Mode)
● Protections
In addition, two open-drain output pins (CDRA, CDRB) are
asserted every time the internal current regulation takes
control of the driver. This allows the external controller to
monitor the activity of the internal current loop.
• OCP for Each Individual Channel
• UVLO
• TSD T = 165°C
J
The maximum user configurable current regulation thresh-
● TQFN32 5mm x 5mm Package and TSSOP28 4.4mm
x 9.7mm Package
old (I
) can be set up to 3.8A and is limited by the
TRIP_MAX
Overcurrent Protection (OCP). The I
current thresh-
TRIP
olds can be set independently for the two full bridges by
connecting external resistors from pins REFA and REFB
to GND. Because of thermal considerations, the recom-
mended maximum RMS current for standard four-layer
PCBs is 2A
per H-bridge.
RMS
The MAX22211 features OCP, thermal shutdown (TSD),
and undervoltage lockout (UVLO) protection. An open-
drain active low FAULT pin is activated every time a fault
condition is detected. During TSD and UVLO events, the
driver is three-stated until normal operations are restored.
19-101537; Rev 0; 2/23
Ordering Information appears at end of data sheet.
© 2023 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 | © 2023 Analog Devices, Inc. All rights reserved.
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