A4988SETTR-T Motor Driver IC Controller QFN28 Allegro Original
Description
The A4988 is a complete micro stepping motor driver with built-in
translator for easy operation. It is designed to operate bipolar
stepper motors in full-, half-, quarter-, eighth-, and
sixteenth-step modes, with an output drive capacity of up to 35 V
and ±2 A.
The A4988 includes a fixed off-time current regulator which has the
ability to operate in slow or mixed decay modes. The translator is
the key to the easy implementation of the A4988. Simply inputting
one pulse on the STEP input drives the motor one microstep. There
are no phase sequence tables, high-frequencycontrollines,or
complexinterfacestoprogram.
The A4988 interface is an ideal fit for applications where a
complex micro processor is unavailable or is overburdened. During
stepping operation, the chopping control in the A4988 automatically
selects the current decay mode:slow or mixed.In mixed decay mode,
the device isset initially to a fast decay for a proportion of the
fixed off-time, then to a slow decay for the remainder of the
off-time. Mixed decay current control results in reduced audible
motor noise, increased step accuracy, and reduced power dissipation
Features
▪ Low Rds(on) outputs
▪ Automatic current decay mode detection/selection
▪ Mixed and slow current decay modes
▪ Synchronous rectification for low power dissipation
▪ Internal UVLO
▪ Crossover-current protection
▪ 3.3 and 5 V compatible logic supply
▪ Thermal shutdown circuitry
▪ Short-to-ground protection
▪ Shorted load protection
▪ Five selectable step modes: full, 1/2, 1/4, 1/8, and 1/16
Absolute Maximum Ratings
Load Supply Voltage VBB: 35 V
Output Current IOUT: ±2 A
Logic Input Voltage VIN :–0.3 to 5.5 V
Logic Supply Voltage VDD :–0.3 to 5.5 V
Motor Outputs Voltage :–2.0 to 37 V
Sense Voltage VSENSE: –0.5 to 0.5 V
Reference Voltage VREF: 5.5 V
Operating Ambient Temperature TA : –20 to 85 ºC
Maximum Junction TJ(max) :150 ºC
Storage Temperature Tstg :–55 to 150 ºC
