A3987 查看數據表（PDF） - Allegro MicroSystems
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A3987 Datasheet PDF : 13 Pages
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A3987
DMOS Microstepping Driver with Translator
Description (continued)
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 A3987 is supplied in a thin profile (1.2 mm maximum height)
24-lead TSSOP (suffix LP) with exposed thermal tab. The package
is lead (Pb) free with 100% matte tin leadframe plating.
Selection Guide
Part Number
A3987SLP-T
A3987SLPTR-T
Package
24-pin TSSOP with exposed thermal pad
24-pin TSSOP with exposed thermal pad
Packing
62 pieces / tube
3000 pieces / reel
Absolute Maximum Ratings
Characteristic
Load Supply Voltage
Output Current
Logic Supply Voltage
Logic Input Voltage Range
VBBx to OUTx
Sense Voltage
Reference Voltage
Nominal Operating Temperature
Maximum Junction Temperature
Storage Temperature
Symbol
VBB
IOUT
VDD
VIN
VSENSE
VREF
TA
TJ(max)
Tstg
Notes
Output current rating may be limited by duty cycle, ambient
temperature, and heat sinking. Under any set of conditions,
do not exceed the specified current rating or a junction tem-
perature of 150°C.
Range S
Rating
50
Units
V
±1.5
A
7.0
V
–0.3 to VDD + 0.3
V
50
V
0.5
V
0 to 4
V
–20 to 85
ºC
150
ºC
–55 to 150
ºC
Thermal Characteristics*
Characteristic
Symbol
Package Thermal Resistance
RθJA
*Additional thermal data available on the Allegro website.
Notes
4-layer PCB based on JEDEC standard
2-layer PCB with 3.8 in.2 2 oz. copper each side
Rating
28
32
Units
°C/W
°C/W
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
20
Maximum Power Dissipation, PD(max)
(R
(R
θJA
= 3θJ2AºC=/2W8)ºC/W)
40 60 80 100 120 140 160 180
Temperature (°C)
Allegro MicroSystems, Inc.
2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
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