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MICROSTEPPING DRIVER
WITH TRANSLATOR
ABSOLUTE MAXIMUM RATINGS
at T
A
= +25°C
Load Supply Voltage, V
BB
............. 30 V
Output Current, I
OUT
Continuous ..................... ±750 mA
*
Peak................................. ±850 mA
Logic Supply Voltage, V
CC
........... 7.0 V
Logic Input Voltage Range, V
IN
(t
w
>30 ns)............. -0.3 V to +7.0 V
(t
w
<30 ns)................ -1 V to +7.0 V
Sense Voltage, V
SENSE
............... 0.68 V
Reference Voltage, V
REF
................ V
CC
Package Power Dissipation,
P
D
................................. See page 8
Operating Temperature Range,
T
A
........................... -20°C to +85°C
Junction Temperature, T
J
......... +150°C
Storage Temperature Range,
T
S
......................... -55°C to +150°C
* 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 temperature of 150°C.
Data Sheet
26184.24C
3967
The A3967SLB 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 capabil-
ity of 30 V and ±750 mA. The A3967SLB 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
A3967SLB. 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 A3967SLB
interface is an ideal fit for applications where a complex µP is unavail-
able or over-burdened.
Internal circuit protection includes thermal shutdown with hyster-
esis, under-voltage lockout (UVLO) and crossover-current protection.
Special power-up sequencing is not required.
The A3967SLB is supplied in a 24-lead SOIC with copper batwing
tabs. The tabs are at ground potential and need no insulation. A lead-
free (100% matte tin leadframe) version is also available.
FEATURES
■ ±750 mA, 30 V Output Rating
■ Satlington™ Sink Drivers
■ Automatic Current-Decay Mode Detection/Selection
■ 3.0 V to 5.5 V Logic Supply Voltage Range
■ Mixed, Fast, and Slow Current-Decay Modes
■ Internal UVLO and Thermal Shutdown Circuitry
■ Crossover-Current Protection
LOAD
SUPPLY
1
SLEEP
ENABLE
OUT
1A
GND
STEP
OUT
1B
RESET
LOAD
SUPPLY
2
SENSE
1
DIR
OUT
2A
PFD
RC
1
REF
÷8
RC
2
LOGIC
SUPPLY
OUT
2B
MS
2
MS
1
SENSE
2
PWM
TIMER
TRANSLATOR
& CONTROL
LOGIC
V
BB2
V
BB1
V
CC
Dwg. PP-075-2
23
17
8
1
2
3
4
5
6
7
9
12
16
15
14
13
24
22
21
20
19
18
11
10
GND
GND
GND
Always order by complete part number:
Part Number Package
A3967SLB 24-lead batwing SOIC
A3967SLB-T 24-lead batwing SOIC; Lead-free
