Automotive Stepping Motor Driver IC: TB9120AFTG

TB9120FTG Block diagram

The TB9120AFTG is a constant-current 2-phase bipolar stepping motor driver IC capable of generating microstepped sine waves only from an input clock signal, eliminating the need for a high-performance MCU and software.

The AEC-Q100-compliant TB9120AFTG driver IC incorporates low on-resistance DMOS FETs, and can deliver a 1.5A (maximum) current. Thanks to the large number of micro-steps supported, motor noise can be significantly reduced, with applications benefitting from smoother operation and more precise control. The built-in mixed decay mode helps to stabilize the current waveforms and numerous protection mechanisms are incorporated including over-current and over-temperature detection, plus thermal shutdown. There is also a stall detection function. The TB9120AFTG is supplied in a compact VQFN package (with 6.0 mm x 6.0mm dimensions) featuring wettable flanks to allow the use of automated optical inspection (AOI) for ensuring the quality of solder joints. It supports an operational temperature range covering -40°C to 125°C. Key applications include battery management systems, or refrigeration circuit expansion valves for air conditioning.

TB9120AFTG Datasheet

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  • Clock input signal type
  • Constant current PWM with mixed decay mode
  • Number of microsteps per full step: Selectable from 1, 2, 4, 8, 16, and 32
  • Built in MOSFETs for 1A class
  • 0.8Ω (Upper + lower, typ.)
  • Operating voltage：4.5～18V
    (Some characteristics are excluded from any guarantees in 4.5～7V.)
  • Max voltage ：40V　peak（load　dump）
  • Operation temp ：Ta＝-40~125℃
  • Package：　Wettable flank VQFN28
  • AEC-Q100： Qualified

TB9120FTG

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