A3977SLPTR-T

Product Summary

The A3977SLPTR-T is a complete microstepping motor driver, with builtin translator. It is designed to operate bipolar stepper motors in full-, half-, quarter-, and eighth-step modes, with output drive capability of 35 V and ±2.5 A. The A3977SLPTR-T includes a fixed off-time current regulator that has the ability to operate in slow-, fast-, or mixed-decay modes. This current-decay control scheme results in reduced audible motor noise, increased step accuracy, and reduced power dissipation. The translator is the key to the easy implementation of the A3977SLPTR-T. Simply inputting one pulse on the STEP input drives the motor one step (two logic inputs determine if it is a full-, half-, quarter-, or eighth-step). There are no phase-sequence tables, high-frequency control lines, or complex interfaces to program. The A3977SLPTR-T interface is an ideal fit for applications where a complex microprocessor is unavailable or over-burdened. Internal synchronous-rectification control circuitry is provided to improve power dissipation during PWM operation. Internal circuit protection includes thermal shutdown with hysteresis, undervoltage lockout (UVLO) and crossover-current protection. Special power-up sequencing is not required. The A3977SLPTR-T is supplied in a choice of two power packages, a 44-pin plastic PLCC with 3 internally-fused pins on each of four sides (suffix ED), and a thin (<1.2 mm), 28-pin TSSOP with an exposed thermal pad (suffix LP). Both packages are lead (Pb) free, with 100% matte tin leadframe plating.

Parametrics

Absolute maximum ratings:(1)Load Supply Voltage, VBB: 35V; (2)Logic Supply Voltage, VDD 7.0V; (3)Logic Input Voltage Range, VIN, Pulsed, tw > 30 ns –0.3 to VDD+0.3V; (4)Logic Input Voltage Range, VIN, Pulsed, tw < 30 ns –1.0 to VDD+ 1V; (5)Reference Voltage, VREF: VDD V; (6)Sense Voltage (DC), VSENSE: 0.5V; (7)Output Current, IOUT: ±2.5 A; (8)Operating Ambient Temperature, TA: –40 to 125℃; (9)Operating Ambient Temperature, TA: –20 to 85℃; (10)Maximum Junction Temperature, TJ(max): 150℃; (11)Storage Temperature, Tstg: –55 to 150℃.

Features

Features: (1)±2.5 A, 35 V output rating; (2)Low rDS(on) outputs, 0.45 Ω source, 0.36 Ω sink typical; (3)Automatic current decay mode detection/selection; (4)3.0 to 5.5 V logic supply voltage range; (5)Mixed, fast, and slow current decay modes; (6)Home output; (7)Synchronous rectification for low power dissipation; (8)Internal UVLO and thermal shutdown circuitry; (9)Crossover-current protection.

Diagrams