A4985_12 Datasheet, PDF (5/22 Pages) Allegro MicroSystems – DMOS Microstepping Driver with Translator And Overcurrent Protection

A4985
DMOS Microstepping Driver with Translator
And Overcurrent Protection
THERMAL CHARACTERISTICS may require derating at maximum conditions
Characteristic
Symbol
Test Conditions*
ES package; estimated, on 4-layer PCB, based on JEDEC standard
Package Thermal Resistance
R_θJA ET package; estimated, on 4-layer PCB, based on JEDEC standard
LP package; on 4-layer PCB, based on JEDEC standard
Value Units
37 ºC/W
32 ºC/W
28 ºC/W
*In still air. Additional thermal information available on Allegro Web site.
Maximum Power Dissipation, P_D(max)
5.5
5.0
4.5
4.0 R
3.5
3.0
Q_{JA = 32 ºC/W}
R
R
Q_{JA = 28 ºC/W}
2.5
2.0
Q_{JA = 37 ºC/W}
1.5
1.0
0.5
0.0
20 40 60 80 100 120 140 160 180
Temperature (°C)
Allegro MicroSystems, Inc.
5
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
www.allegromicro.com