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A3967SLB

P1-P3P4-P6P7-P9P10-P12P13-P15
Description
The A3967 is a complete microstepping motor driver with built-
in translator. It is designed to operate bipolar stepper motors in
full-, half-, quarter-, and eighth-step modes, with output drive
capability of 30 V and ±750 mA. The A3967 includes a fixed
off-time current regulator that has the ability to operate in slow,
fast, or mixed current-decay modes. This current-decay control
scheme results in reduced audible motor noise, increased step
accuracy, and reduced power dissipation.
The translator is the key to the easy implementation of the
A3967. By simply inputting one pulse on the STEP input the
motor will take one step (full, half, quarter, or eighth depending
on two logic inputs). There are no phase-sequence tables, high-
frequency control lines, or complex interfaces to program. The
A3967 interface is an ideal fit for applications where a complex
μP is unavailable or over-burdened.
Internal circuit protection includes thermal shutdown with
hysteresis, under-voltage lockout (UVLO) and crossover-
current protection. Special power-up sequencing is not
required.
The A3967 is supplied in a 24-pin SOIC, which is lead (Pb)
free with 100% matte tin leadframe plating. Four pins are
fused internally for enhanced thermal dissipation. The pins
are at ground potential and need no insulation.
26184.24H
Features and Benefits
▪ ±750 mA, 30 V output rating
▪ Satlington® sink drivers
▪ Automatic current-decay mode detection/selection
▪ 3.0 to 5.5 V logic supply voltage range
▪ Mixed, fast, and slow current-decay modes
▪ Internal UVLO and thermal shutdown circuitry
▪ Crossover-current protection
Microstepping Driver with Translator
Package: 24-pin SOIC with internally
fused pins (suffix LB)
Functional Block Diagram
Not to scale
A3967
1918
SENSE
1
V
BB1
V
BB2
OUT
1A
OUT
1B
OUT
2A
OUT
2B
SENSE
2
5
9
20
16
21
17
8
4
TRANSLATOR
LOAD
SUPPLY
Dwg. FP-050-3A
PWM TIMER
PWM TIMER
PWM LATCH
BLANKING
MIXED DECAY
CONTROL LOGIC
UVLO
AND
FAULT
DETECT
DAC
+-
+-
DAC
SENSE
PWM LATCH
BLANKING
MIXED DECAY
3
3
REF
LOGIC
SUPPLY
V
CC
STEP
DIR
MS
1
SLEEP
MS
2
ENABLE
RC
1
RESET
PFD
RC
2
REF.
SUPPLY
V
PF
÷8
14
1
23
10
11
22
12
13
3
15
24
2
76
Microstepping Driver with Translator
A3967
2
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Selection Guide
Part Number Packing Package
A3967SLBTR-T 24-pin SOIC with internally fused pins 1000 per reel
Absolute Maximum Ratings
Characteristic Symbol Notes Rating Units
Load Supply Voltage V
BB
30 V
Logic Supply Voltage V
CC
7.0 V
Logic Input Voltage Range V
IN
t
w
> 30 ns –0.3 to 7.0 V
t
w
< 30 ns –1 to 7.0 V
Sense Voltage V
SENSE
0.68 V
Reference Voltage V
REF
V
CC
mA
Output Current I
OUT
Output current rating may be limited by duty cycle, am-
bient temperature, and heat sinking. Under any set of
conditions, do not exceed the specifi ed current rating
or a junction temperature of 150°C.
Continuous ±750 mA
Peak ±850 mA
Package Power Dissipation P
D
See graph ––
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 toler-
ated but should be avoided.
150 ºC
Storage Temperature T
stg
–55 to 150 ºC
50 75 100 125 150
5
1
0
ALLOWABLE PACKAGE POWER DISSIPATION (W)
TEMPERATURE IN
o
C
4
3
2
25
R = 6.0
o
C/W
Q
JT
Q
R = 50°C/W
JA
Q
R = 35°C/W
JA
Thermal Characteristics
Characteristic Symbol Test Conditions* Value Units
Package Thermal Resistance, Junction
to Ambient
R
θJA
2-layer PCB, 1.3 in.
2
2-oz. exposed copper 50 ºC/W
4-layer PCB, based on JEDEC standard 35 ºC/W
*Additional thermal information available on Allegro website.
Microstepping Driver with Translator
A3967
3
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
ELECTRICAL CHARACTERISTICS at T
A
= +25°C, V
BB
= 30 V, V
CC
= 3.0 V to 5.5V (unless otherwise
noted)
Limits
Characteristic Symbol Test Conditions Min. Typ. Max. Units
Output Drivers
Load Supply Voltage Range V
BB
Operating 4.75 – 30 V
During sleep mode 0 – 30 V
Output Leakage Current I
CEX
V
OUT
= V
BB
– <1.0 20 μA
V
OUT
= 0 V – <-1.0 -20 μA
Output Saturation Voltage V
CE(sat)
Source driver, I
OUT
= -750 mA
– 1.9 2.1 V
Source driver, I
OUT
= -400 mA
– 1.7 2.0 V
Sink driver, I
OUT
= 750 mA – 0.65 1.3 V
Sink driver, I
OUT
= 400 mA – 0.21 0.5 V
Clamp Diode Forward Voltage V
F
I
F
= 750 mA – 1.4 1.6 V
I
F
= 400 mA – 1.1 1.4 V
Motor Supply Current I
BB
Outputs enabled – – 5.0 mA
RESET high
– – 200 μA
Sleep mode – – 20 μA
Control Logic
Logic Supply Voltage Range V
CC
Operating 3.0 5.0 5.5 V
Logic Input Voltage V
IN(1)
0.7V
CC
– – V
V
IN(0)
– – 0.3V
CC
V
Logic Input Current I
IN(1)
V
IN
= 0.7V
CC
-20 <1.0 20 μA
I
IN(0)
V
IN
= 0.3V
CC
-20 <1.0 20 μA
Maximum STEP Frequency f
STEP
500* – – kHz
Blank Time t
BLANK
R
t
= 56 kΩ, C
t
= 680 pF 700 950 1200 ns
Fixed Off Time t
off
R
t
= 56 kΩ, C
t
= 680 pF 30 38 46 μs
continued next page …
Table 1. Microstep Resolution Truth Table
MS1 MS2 Resolution
L L Full step (2 phase)
H L Half step
L H Quarter step
H H Eighth step
P1-P3P4-P6P7-P9P10-P12P13-P15

A3967SLB

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IC MTR DRV BIPOLAR 3-5.5V 24SOIC
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