Full-Bridge PWM Microstepping Motor Driver
A4975
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Description (continued)
Selection Guide
Part Number Packing Package
A4975SB-T 16-pin DIP with exposed thermal tabs 25 per tube
A4975SLBTR-T 16-pin SOICW with internally fused pins 1000 per reel
Internal circuit protection includes thermal shutdown with hysteresis,
an undervoltage monitor, and crossover-current protection. Special
power-up sequencing is not required.
The A4975 is supplied in a choice of two power packages; a 16-pin
dual-in-line plastic package with copper heat-sink tabs (suffix ‘B’),
and a 16-lead plastic SOIC with internally fused pins (suffix ‘LB’).
For both package styles, the thermally enhanced pins are at ground
potential and need no electrical isolation. Both packages are lead
(Pb) free, with leadframe plating 100% matte tin.
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
Load Supply Voltage V
BB
50 V
Logic Supply Voltage V
CC
6V
Logic/Reference Input Voltage Range V
IN
–0.3 to 6 V
Sense Voltage V
S
0.5 V
Output Current, Continuous I
OUT
Output current rating may be limited by duty cycle, ambient
temperature, and heat sinking. Under any set of conditions, do
not exceed the specifi ed current rating or a junction tempera-
ture of 150°C.
±1.5 A
Package Power Dissipation P
D
See graph W
Operating Ambient Temperature T
A
Range S –20 to 85 ºC
Maximum Junction Temperature T
J
(max)
Fault conditions that produce excessive junction temperature
will activate the device’s thermal shutdown circuitry. These
conditions can be tolerated but should be avoided.
150 ºC
Storage Temperature T
stg
–55 to 150 ºC
Thermal Characteristics
Characteristic Symbol Test Conditions* Value Units
Package Thermal Resistance, Junction
to Ambient
R
JA
B Package, single-layer PCB, 1 in.
2
2-oz. exposed copper 43 ºC/W
LB Package, 2-layer PCB, 0.3 in.
2
2-oz. exposed copper each
side
67 ºC/W
Package Thermal Resistance, Junction
to Tab
R
JT
6 ºC/W
*Additional thermal information available on Allegro website.
50 75 100 125 150
1
0
ALLOWABLE PACKAGE POWER DISSIPATION (W)
TEMPERATURE IN °C
4
3
2
25
R = 6.0°C/W
θJT
SUFFIX 'B', R = 43°C/W
θ
JA
SUFFIX 'LB', R = 67°C/W
θJA
