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65V, 3.8A Stepper Motor Driver with Integrated Current-Sense and 128 Usteps Indexer

Industry’s Smallest 65V Stepper Solution with Microstepping

Product Details

Key Features

Parametric specs for DC Motor Drivers
No. of Drivers 1
Peak Motor Current (A) 3.8
VSUPPLY (V) (min) 4.5
VSUPPLY (V) (max) 65
Total RON (mΩ) (typ) 300
Direction Control DIR
Current Regulation Fast
Internal CR Reference Yes
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN-CU/38
Budgetary
Price (See Notes)
2
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Simplified Block Diagram

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Parameters

Parametric specs for DC Motor Drivers
No. of Drivers 1
Peak Motor Current (A) 3.8
VSUPPLY (V) (min) 4.5
VSUPPLY (V) (max) 65
Total RON (mΩ) (typ) 300
Direction Control DIR
Current Regulation Fast
Internal CR Reference Yes
Oper. Temp. (°C) -40 to +125
Package/Pins TQFN-CU/38
Budgetary
Price (See Notes)
2

Key Features

  • Two H-Bridges with +65V Voltage Rating
    • Total Rdson (High-Side + Low-Side): 300mΩ Typical (TA = 25°C)
  • Current Ratings per H-Bridge (Typical at TA = 25°C):
    • IMAX = 3.8AMAX (Impulsive Current for Driving Capacitive Loads)
    • IFS(MAX) = 2.8A (Maximum Full Scale Current Setting for Internal Current Drive Regulation)
    • IRMS = 2ARMS per Phase (TA = 25°C, VM = +24V)
  • Integrated Current Control
    • 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
  • Current-Sense Output (ISENA, ISENB) Current Monitor
  • Fault Indicator Pin Active-Low (FAULT)
  • Protections
    • Overcurrent Protection for each Individual Channel (OCP)
    • Undervoltage Lockout (UVLO)
    • Thermal Shutdown TJ = 155°C (TSD)
  • TQFN38 5mm x 7mm Package (TSSOP38 4.4mm x 9.7mm Available in the Future)

Applications/Uses

  • Stepper Motor Driver

Description

The MAX22204 is a two-phase stepper motor driver. It integrates two 65V, 3.8AMAX H-Bridges. The H-Bridge FETs have very low impedance, resulting in high driving efficiency and minimal heat. The typical total RON (high-side + low-side) is 0.3Ω. The MAX22204 integrates an accurate 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.

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 (ITRIP), the device enforces the decay for a fixed OFF-time (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. Currents proportional to the internally-sensed bridge currents are output to pins ISENA and ISENB. By connecting external resistors to these pins, voltages proportional to the bridge currents are generated. These can be used for diagnostic purposes.

The maximum output current per H-Bridge is IMAX = 3.8AMAX limited by the Overcurrent Protection (OCP). The device delivers up to 2ARMS per phase 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 maximum full-scale current per H-Bridge is IFS = 2.8A 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.

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 disabled until normal operating conditions are restored.

The MAX22204 is packaged into a TQFN38 5mm x 7mm package.

Simplified Block Diagram

MAX22204: Simplified Block Diagram MAX22204: Simplified Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .