65V, 3.8A Dual Brushed or Single Stepper Motor Driver with Integrated Current Sense

The MAX22203 is a dual 65V, 3.8AMAX H-Bridge with PWM inputs and accurate Current Drive Regulation (CDR). Each H-Bridge can be controlled individually and has a very low typical RON (high-side + low-side) of 0.3Ω, resulting in high driving efficiency and low heat generation. The MAX22203 can be used to drive two Brushed DC motors or a single Stepper motor.

The integrated CDR can limit the start up or stall the cur- rent 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), eliminating the bulky external power resistors (normally required for this function) and compared with a configurable threshold current (ITRIP). The ITRIP threshold can be set independently for the two full bridges by connecting the external resistors to pins REFA and REFB.

The maximum output current per H-Bridge is IMAX = 3.8A and is limited by the Overcurrent Protection (OCP) circuit. This current can be driven for very short transients and is aimed to effectively drive small capacitive loads. The maximum user-configurable current regulation threshold is ITRIPMAX = 3A. The maximum RMS current (IRMS) per H-Bridge is 2ARMS on a standard JEDEC 4-layer board. The maximum RMS current can be limited by thermal considerations and depends on the thermal characteristic of the application (PCB ground planes, heat sinks, forced air ventilation, etc).

The MAX22203 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 tristated until normal operating conditions are restored.

The MAX22203 is packaged into a small TQFN38 5mm x 7mm and TSSOP38 9.7mm x 4.4mm packages.

* Two H-Bridges with 65V Maximum Operating Voltage

* Total RON (High-Side + Low-Side): 300mΩ typical (TA = 25°C)

* Current Ratings Per H-Bridge (Typical at 25°C):

* IMAX = 8A (Impulsive Current for Driving Capacitive Loads)* ITRIPMAX = 3A (Maximum Current Setting for Internal Current Drive Regulation)* IRMS = 2ARMS

* Integrated Current Drive Regulation (CDR)

* Internal Current Sensing (ICS) Eliminates External Bulky Resistors and Improves Efficiency* Current Drive Regulation Monitor Output Pins (CDRA and CDRB)* Multiple Decay Modes (Slow, Mixed, Fast)* Fixed Off Time Configurable with External

* Current-Sense Output (Current Monitor)* Fault Indicator Pin (FAULT)* Protections

* Overcurrent Protection for Each Individual Channel (OCP)* Undervoltage Lockout (UVLO)* Thermal Shutdown (TSD) TJ = +165°C

* Available in TQFN38 5mm x 7mm and TSSOP38 9.7mm x 4.4mm Packages