Bipolar stepping motor driver with a clock input interface for automotive applications

Overview

TB9120AFTG is a two-phase bipolar stepping motor driver

with a clock input interface and a PWM constant-current

control system. It can be used for a small stepping motor

in a wide range of automotive applications.

Applications

Small stepping motors for automotive applications such as an

adjustment to an angle of a concave mirror in HUD, valves in

motorcycles and valves/dampers for HVAC

Features

 A two-phase bipolar stepping motor can be driven with a single chip.

 Adoption of PWM constant-current control

 Built-in a mixed decay mode

 Excitation mode selectable: full, half, quarter, 1/8, 1/16, and 1/32 step

 On-resistance of power MOSFETs: Ron(H+L)=0.8Ω(typ.)

 Input power supply voltage(VBAT): 40V(max)

 Maximum output driving current: Overcurrent detection value, 2.0A(typ.)

 Internal voltage 5V(VccOUT)

 Anomaly detection functions: Over temperature detection, overcurrent detection, load open

detection and low voltage detection

 DIAG output: Over temperature detection, overcurrent detection and load open detection

 Stall detection function and flag output function if detected

 Standby function

 Operating power supply voltage range: VBAT(opr.)=7V to 18V. Only some of the functions are

guaranteed in 4.5V to 7V.

 Maximum clock input frequency: fCLK(max)＝100kHz

 Operating temperature: -40 to 125°C

 Package: VQFN28(0.65)

 AEC-Q100 qualified