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PDF A3901 Data sheet ( Hoja de datos )
| Número de pieza | A3901 | |
| Descripción | Dual Full Bridge Low Voltage Motor Driver | |
| Fabricantes | Allegro | |
| Logotipo |  |
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A3901
Dual Full Bridge Low Voltage Motor Driver
Features and Benefits
▪ Low RDS(on) outputs
▪ Full- and half-stepping capability
▪ Small package
▪ Forward, reverse, and brake modes for DC motors
▪ Sleep mode with zero current drain
▪ PWM control up to 250 kHz
▪ Crossover-current protection
▪ Thermal shutdown (TSD)
Package: 10 Contact DFN (suffix EJ)
Description
The A3901 is a dual full-bridge motor driver, designed for low
voltage portable applications involving bipolar stepper or brush
DC motors. The outputs have been optimized for low voltage
drop, with currents up to ±400 mA (±800 mA with outputs
paralleled) and an operating voltage range of 2.5 to 5.5 V.
The four inputs (IN1 to IN4) can control a bipolar stepper motor
in full- or half-step mode, or DC motors in forward, reverse,
or brake mode. The inputs can be PWMed for current or speed
control at frequencies up to 250 kHz.
Internal protection circuitry includes thermal shut down (TSD)
and crossover (shoot-through) protection.
The A3901 is supplied in a 3 mm x 3 mm x 0.75 mm nominal
height, 10-lead DFN package, with exposed thermal pad
(package “EJ”). This small footprint package is lead (Pb) free,
with 100% matte tin leadframe plating.
Approximate Scale 1:1
Typical Application
+VBAT
10 µF
10 V
VBB
OUT1
IN1
CPU
IN2 OUT2
A3901
IN3
OUT3
IN4
GND
OUT4
M
+VBAT
10 µF
10 V
CPU
VBB
IN1 OUT1
IN2 OUT2
A3901
IN3
OUT3
IN4
GND
OUT4
Figure 1. Typical stepper motor control
+VBAT
10 µF
10 V
M
CPU
M
VBB
IN1 OUT1
IN2 OUT2
A3901
IN3
OUT3
IN4
GND
OUT4
M
Figure 2. Typical dual DC motor control
3901-DS, Rev. 5
Figure 3. Typical single DC motor control (paralleled outputs)
1 page  
A3901
Dual Full Bridge Low Voltage Motor Driver
Motor Operation Truth Table
INx1
OUT12 OUT2 OUT3 OUT4
Stepper Motor
IN1 IN2 IN3 IN4
0 0 0 0 OFF OFF OFF OFF
1 0 1 0HLHL
0 0 1 0 OFF OFF H L
0 1 1 0 LHH L
0 1 0 0 L H OFF OFF
0 1 0 1 LHLH
0 0 0 1 OFF OFF L H
1 0 0 1HL LH
1 0 0 0 H L OFF OFF
DC Motor (Dual)
IN1 or IN3
0
IN2 or IN4
0
OFF OFF OFF OFF
1 0 HLHL
0 1 LHLH
1 1 LLLL
DC Motor (Single, Paralleled)
IN1 and IN3
0
IN2 and IN4
0
OFF OFF OFF OFF
1 0 HLHL
0 1 LHLH
1 1 LLLL
DC Motor (External PWM)
IN1 or IN3
IN2 or IN4
1 0 HLHL
0 0 OFF OFF OFF OFF
0 1 LHLH
0 0 OFF OFF OFF OFF
1 0 HLHL
1 1 LLLL
0 1 LHLH
1 1 LLLL
10 = logic low, VINx< VIN(0)(max); 1 = logic high, VINx> VIN(1)(min)
2H = voltage high, source driver on; L = voltage low, sink driver on
Function
Full Stepping
Sleep Mode
Step 1
–
Step 2
–
Step 3
–
Step 4
–
Half-Stepping
Sleep Mode
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
Step 7
Step 8
Hi-Z (Sleep Mode)/Coast
Forward
Reverse
Brake
Hi-Z (Sleep Mode)/Coast
Forward
Reverse
Brake
Forward
Fast Decay
Reverse
Fast Decay
Forward
Slow Decay
Reverse
Slow Decay
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
5
5 Page 
A3901
Dual Full Bridge Low Voltage Motor Driver
Package EJ, 10-contact DFN
3.00
10
A
12
D 11X
0.08 C
0.25
0.50
12
0.40
B
10 2.38
3.00
0.75
1.65
0.30
0.85 10
0.50
1.65 3.10
1
2.38
C PCB Layout Reference View
All dimensions nominal, not for tooling use
(reference JEDEC MO-229WEED)
Dimensions in millimeters
Exact case and lead configuration at supplier discretion within limits shown
A Terminal #1 mark area
B Exposed thermal pad (reference only, terminal #1
identifier appearance at supplier discretion)
C Reference land pattern layout (reference
IPC7351 SON50P300X300X80-11WEED3M);
All pads a minimum of 0.20 mm from all adjacent pads; adjust as
necessary to meet application process requirements and PCB layout
tolerances; when mounting on a multilayer PCB, thermal vias at the
exposed thermal pad land can improve thermal dissipation (reference
EIA/JEDEC Standard JESD51-5)
D Coplanarity includes exposed thermal pad and terminals
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet A3901.PDF ] | |
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