TI DRV8846RGER

The DRV8846 provides a highly-integrated stepper motor driver for cameras, printers, projectors, and other automated equipment applications. The device has two H-bridges and a microstepping indexer and is intended to drive a bipolar stepper motor. The output block of each H-bridge driver consists of N-channel and P-channel power MOSFETs configured as full H-bridges to drive the motor windings. The DRV8846 is capable of driving up to 1.4-A full-scale output current (with proper heatsinking and TA = 25°C). A simple STEP/DIR interface allows easy interfacing to controller circuits. Pins allow configuration of the motor in full-step up to 1/32-step modes. Decay mode is configurable so that AutoTune, slow decay, fast decay, and mixed decay can be used. The PWM current chopping off-time can also be selected. A low-power sleep mode is provided which shuts down internal circuitry to achieve very-low quiescent current draw. This sleep mode can be set using a dedicated nSLEEP pin. Internal protection functions are provided for UVLO, overcurrent protection, short circuit protection, and overtemperature. Fault conditions are indicated via a nFAULT pin.

• PWM Microstepping Motor Driver
• Built-In Microstepping Indexer Up to 1/32 Microstepping Step/Direction Control
• Multiple Decay Modes
• AutoTune™ Technology
• Mixed Decay
• Slow Decay
• Fast Decay
• Configurable Off-Time PWM Chopping
• 10-, 20-, or 30-μs Off-Time
• Adaptive Blanking Time for Smooth Stepping
• 4- to 18-V Operating Supply Voltage Range
• 1.4-A (Full Scale (Max Drive) Current per H Bridge (at 25°C)
• Low-Current Sleep Mode
• 3-Bit Torque DAC to Scale Motor Current
• Thermally Enhanced Surface Mount Package
• Protection Features
• VM Undervoltage Lockout (UVLO) Overcurrent Protection (OCP) Thermal Shutdown (TSD) Fault Condition Indication Pin (nFAULT)

• Printers
• Scanners
• Video Security Cameras
• Projectors