Chip Introduction
The SS8841 provides a dual-channel integrated motor drive solution for printers and other integrated motor applications. The SS8841 has two H-bridge drivers, each delivering a maximum peak current of 2.5A and rms current (at 24V and Ta = 25°C under appropriate heat dissipation conditions) to drive two brush DC motors, or a bipolar stepper motor, or solenoids or other inductive loads. Bipolar stepper motors can be operated in full steps, 2 segments, 4 segments, or high subdivisions can be achieved with software.
The power output module for each H-bridge of the SS8841 consists of N-type power MOSFETs. Each H-bridge contains a rectifier circuit and a current-limiting circuit. Simple parallel digital control interface with choice of fast attenuation, slow attenuation, and mixed attenuation modes in attenuation modes.
The SS8841 provides a low-power sleep mode to shut down internal circuitry to achieve very low quiescent current. This sleep mode is achieved by setting the nSLEEP pin.
Internal shutdown includes overcurrent protection, short-circuit protection, undervoltage lockout protection, and overtemperature protection, and provides a fault output pin nFAULT pin.
The SS8841 is available in an eTSSOP28 package with exposed pads for improved heat dissipation, is Pb-free, and features 100% tin-free leadframe plating.
Chip characteristics
Dual channel H-bridge current control motor driver – single or two brushed DC motors – one stepper motor
PWM control interface
Selectable current control at fixed frequency – 2 bits current control with 4 current steps
Low on-impedance metal-oxide semiconductor field-effect transistor (MOSFET) – 24V, 2.5A maximum drive current at Ta = 25°C – 24V, RDS(on) of 350mΩ at Ta= 25°C (typical HS + LS)
8.2~40V Operating Voltage Range
Sleep Mode Low Current
Built-in 3.3V Reference
Voltage Surface mount package with heatsink
Protection Features – Overcurrent Protection (OCP) – Thermal Shutdown (TSD) – Undervoltage Lockout (UVLO) – Fault Display Pin(nFAULT)
