a4982 Allegro MicroSystems, Inc., a4982 Datasheet - Page 2

• Manufacturer Part Number: a4982
• Description: Dmos Microstepping Driver With Translator And Overcurrent Protection
• Manufacturer: Allegro MicroSystems, Inc.

A4982
Description (continued)
In Mixed decay mode, the device is set 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.
Internal synchronous rectification control circuitry is provided
to improve power dissipation during PWM operation. Internal
circuit protection includes: thermal shutdown with hysteresis,
Absolute Maximum Ratings
Selection Guide
A4982SETTR-T
A4982SLPTR-T
Load Supply Voltage
Output Current
Logic Input Voltage
Logic Supply Voltage
VBBx to OUTx
Sense Voltage
Reference Voltage
Operating Ambient Temperature
Maximum Junction
Storage Temperature
Part Number
Characteristic
32-pin QFN with exposed thermal pad
24-pin TSSOP with exposed thermal pad
Symbol
T
V
Package
J
V
SENSE
I
V
V
(max)
T
OUT
V
T
REF
BB
DD
stg
IN
A
DMOS Microstepping Driver with Translator
Range S
undervoltage lockout (UVLO), and crossover-current protection.
Special power-on sequencing is not required.
The A4982 is supplied in two surface mount package, the ET, a
5 mm × 5 mm, 0.90 mm nominal overall package height QFN
package, and the LP package, a 24-pin TSSOP. Both packages have
exposed pads for enhanced thermal dissipation, and are lead (Pb)
free (suffix –T), with 100% matte tin plated leadframes.
1500 pieces per 7-in. reel
4000 pieces per 13-in. reel
Notes
and Overcurrent Protection
Packing
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
–0.3 to 5.5
–0.3 to 5.5
–55 to 150
–20 to 85
Rating
150
0.5
35
±2
35
5.5
Units
ºC
ºC
ºC
V
V
V
V
V
V
A
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