A4988SETTR-T Allegro Microsystems Inc, A4988SETTR-T Datasheet - Page 18

• Manufacturer Part Number: A4988SETTR-T
• Description: IC MICROSTEPPER MOTOR DRVR 28QFN
• Manufacturer: Allegro Microsystems Inc

Specifications of A4988SETTR-T

• Applications: Stepper Motor Driver
• Number Of Outputs: 1
• Current - Output: ±2A
• Voltage - Load: 8 V ~ 35 V
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -20°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-VFQFN Exposed Pad
• Motor Type: Stepper
• No. Of Outputs: 2
• Output Current: 2A
• Output Voltage: 35V
• Supply Voltage Range: 3V To 5.5V
• Driver Case Style: QFN
• No. Of Pins: 28
• Operating Temperature Range: -20°C To +85°C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 620-1343-2

A4988
*The GND pins must be tied together externally by connecting to the PAD ground plane
under the device.
Terminal List Table
SENSE1
SENSE2
¯ E ¯ ¯ N ¯ ¯ A ¯ ¯ B ¯ ¯ L ¯ ¯ E ¯
¯ S ¯ ¯ L ¯ ¯ E ¯ ¯ E ¯ ¯ P ¯
OUT1B
OUT1A
OUT2A
OUT2B
¯ R ¯ ¯ E ¯ ¯ S ¯ ¯ E ¯ ¯ T ¯
VREG
ROSC
Name
STEP
VBB1
VBB2
GND
MS1
MS2
MS3
VDD
CP1
CP2
VCP
REF
PAD
DIR
NC
DMOS Microstepping Driver with Translator
7, 20, 25
Number
3, 18
10
12
13
14
15
16
17
19
21
22
23
24
26
27
28
11
4
5
6
8
9
1
2
–
ENABLE
OUT2B
GND
VCP
CP1
CP2
NC
Pin-out Diagram
1
2
3
4
5
6
7
Charge pump capacitor terminal
Charge pump capacitor terminal
Reservoir capacitor terminal
Regulator decoupling terminal
Logic input
Logic input
Logic input
Logic input
Timing set
Logic input
Logic supply
Logic input
G
Ground*
Logic input
DMOS Full Bridge 1 Output B
Load supply
Sense resistor terminal for Bridge 1
DMOS Full Bridge 1 Output A
DMOS Full Bridge 2 Output A
Sense resistor terminal for Bridge 2
Load supply
DMOS Full Bridge 2 Output B
Logic input
No connection
Exposed pad for enhanced thermal dissipation*
m
PAD
reference voltage input
21
20
19
18
17
16
15
And Overcurrent Protection
OUT1B
NC
DIR
GND
REF
STEP
VDD
Description
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
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