General Description

The MAX22205 integrates a high current 65V, 7.6AMAX

H-Bridge to drive one Brushed DC motor or one half Stepper motor. The H-Bridge FETs feature very low impedance, resulting in high driving efficiency and low heat. The

typical total RON (high-side + low-side) is 0.15Ω. The HBridge can be PWM controlled by two logic inputs (DINA,

DINB). A third Enable (EN) logic input can be used to configure the outputs to high impedance for coasting the motor.

The MAX22205 features an accurate optional Current Drive Regulation (CDR), which can be used to limit the start

up current of a Brushed DC motor or control the phase

current for stepper operation. The bridge output current is

sensed by a non-dissipative Integrated Current Sensing

(ICS) and it is then compared with the desired threshold

current. As soon as the bridge current exceeds the threshold (ITRIP), the device enforces the decay for a fixed OFFtime (tOFF). The non-dissipative ICS eliminates the bulky

external power resistors normally required for this function, resulting in a dramatic space and power saving compared with mainstream applications based on the external sense resistor. A current proportional to the internally-sensed motor current is output to the analog pins (ISENA, ISENB) to monitor current. Also, one open-drain output (CDR pin) is asserted every time the internal current

regulation is taking control of the driver so that the activity

of the internal current loop can be monitored.

The maximum output current per H-Bridge is IMAX =

7.6AMAX limited by the Overcurrent Protection (OCP). The

device delivers up to 4ARMS at VM = +24V and TA = 25°C

with proper PCB ground plane for thermal dissipation. The

current capability depends on the PCB thermal characteristic (PCB ground planes, heatsinks, ventilation, etc.).

The MAX22205 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, all the channels are

disabled until normal operating conditions are restored.

The MAX22205 is packaged into a small TQFN38 5mm x

7mm and TSSOP38 9.7mm x 4.4mm packages.

Applications

● Brushed DC Motor Driver

● Stepper Motor Driver

● Solenoid Driver

● Latched Valves

Benefits and Features

● One H-Bridge with +65V Voltage Rating

• Total RDS(ON) (High-Side + Low-Side): 150mΩ

Typical (TA = 25°C)

● Current Ratings per H-Bridge (Typical at 25°C):

• IMAX = 7.6AMAX (Impulsive Current for Driving

Capacitive Loads)

• IFS = 6A (Max Full Scale Current Setting for Internal

Current Drive Regulation)

• IRMS = 4ARMS (TA = 25°C, VM = +24V)

● Integrated Current Control

• Full-Scale DAC Current Configurable with External

Resistance

• Internal Current Sensing (ICS) Eliminates External

Bulky Resistors and Improves Efficiency

• Current Drive Regulation Monitor Output Pin (CDR

Pin)

• Integrated DAC Sets the Output Current Level

among 16 Values

• Multiple Decay Modes (Slow, Mixed, Fast)

• Fixed OFF Time Configurable with External

Resistance

● Current-Sense Output (Current Monitor)

● Fault Indicator Pin (FAULT)

● Protections

• Overcurrent Protection for each Individual Channel

(OCP)

• Undervoltage Lockout (UVLO)

• Thermal Shutdown TJ = 155°C (TSD)

● Available in TQFN38 5mm x 7mm and TSSOP38

9.7mm x 4.4mm Packages