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3977
MICROSTEPPING DMOS DRIVER
WITH TRANSLATOR

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The A3977xED and A3977xLP are complete microstepping motor drivers
with built-in translator. They are designed to operate bipolar stepper motors in
full-, half-, quarter-, and eighth-step modes, with output drive capability of 35
V and ¡À2.5 A. The A3977 includes a fixed off-time current regulator that has
the ability to operate in slow-, fast-, or mixed-decay modes. This currentdecay
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 A3977. By
simply inputting one pulse on the STEP input the motor will take one step
(full, half, quarter, or eighth depending on two logic inputs). There are no
phase-sequence tables, high-frequency control lines, or complex interfaces to
program. The A3977 interface is an ideal fit for applications where a complex
¦ÌP 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,
under-voltage lockout (UVLO) and crossover-current protection. Special
power-up sequencing is not required.
The A3977 is supplied in a choice of two power packages, a 44-pin
plastic PLCC with copper batwing tabs (suffix ED), and a thin (<1.2 mm), 28-
pin TSSOP with an exposed thermal pad (suffix LP). The SLP package is
available in a lead-free version (100% matte tin leadframe).

FEATURES
¡ö ¡À2.5 A, 35 V Output Rating
¡ö Low rDS(on) Outputs, 0.45 ¦¸ Source, 0.36 ¦¸ Sink Typical
¡ö Automatic Current Decay Mode Detection/Selection
¡ö 3.0 V to 5.5 V Logic Supply Voltage Range
¡ö Mixed, Fast, and Slow Current Decay Modes
¡ö Home Output
¡ö Synchronous Rectification for Low Power Dissipation
¡ö Internal UVLO and Thermal Shutdown Circuitry
¡ö Crossover-Current Protection

ABSOLUTE MAXIMUM RATINGS
at TA = +25¡ãC
Load Supply Voltage, VBB ............. 35 V
Output Current, IOUT .................. ¡À2.5 A*
Logic Supply Voltage, VDD ........... 7.0 V
Logic Input Voltage Range, VIN
(tw >30 ns) ..... -0.3 V to VDD + 0.3 V
(tw <30 ns) ........... -1 V to VDD + 1 V
Sense Voltage, VSENSE ................. 0.5 V
Reference Voltage, VREF ................ VDD
Package Power Dissipation,
PD................................. See page 3
Operating Temperature Range, TA
(A3977Kx) ............ -40¡ãC to +125¡ãC
(A3977Sx) .............. -20¡ãC to +85¡ãC
Junction Temperature, TJ ......... +150¡ãC
Storage Temperature Range,
TS ......................... -55¡ãC to +150¡ãC