SS8812T-ET-TP

SS8812T provides a dual-channel integrated motor drive solution for printers and other motor-integrated applications. It features two H-bridge drivers, each capable of delivering a maximum output current of 1.6A (at 24V and Ta = 25°C with adequate heat dissipation), capable of driving two brushed DC motors, one bipolar stepper motor, solenoids, or other inductive loads. The bipolar stepper motor can operate in full-step, 2-microstep, or 4-microstep modes, or higher microstepping can be achieved via software. The power output stage of each H-bridge is composed of N-type power MOSFETs. Each H-bridge includes rectification and current limiting circuitry. A simple parallel digital control interface is provided, with selectable decay modes: fast decay, slow decay, and mixed decay. A low-power sleep mode is provided to shut down internal circuitry, achieving very low quiescent current. This sleep mode is activated by setting the nSLEEP pin. Internal protection features include overcurrent protection, short-circuit protection, undervoltage lockout, and overtemperature protection, with a fault output pin nFAULT provided. An eTSSOP28 package with an exposed pad is offered for improved thermal performance. The device is lead-free with 100% matte tin plating on the lead frame. SS8812T is an integrated motor drive solution for bipolar stepper motors or brushed DC motors. It integrates two NMOS H-bridges, current sensing, regulation circuitry, and comprehensive fault detection. A simple PWM interface enables easy connection to an external digital controller with minimal interface resources. The fault indicator pin (nFAULT) provides a flag when the device enters a fault condition. Winding current control allows the external controller to adjust the current supplied to the motor. Current regulation is highly configurable, with three decay modes selectable according to application requirements: fast, slow, and mixed decay. Two-bit current level control allows switching between four different current levels. A low-power sleep mode allows the system to conserve power when the motor is not in operation.

Applications

• POS printers
• Security cameras
• Office automation equipment
• Gaming consoles
• Robots

Key features

• Dual H-bridge current control motor driver – single or dual brushed DC motors – one stepper motor
• PWM control interface
• Selectable current control at fixed frequency – 2-bit current control providing 4 current levels
• Low RDS(on) MOSFETs – 1.6A maximum drive current at 24V, Ta = 25°C – RDS(on) of 720mΩ (typical HS + LS) at 24V, Ta = 25°C
• 8.2~36V operating voltage range
• Low quiescent current in sleep mode
• Integrated 3.3V voltage reference
• Surface mount package with heatsink pad
• Protection features – Overcurrent Protection (OCP) – Thermal Shutdown (TSD) – Undervoltage Lockout (UVLO) – Fault indicator pin (nFAULT)