3967
MICROSTEPPING DRIVER
WITH TRANSLATOR
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.
PWM
TIMER
24 PFD
REF
1
2
÷8
RC
2
23
22
21
RC
1
SLEEP
RESET
3
4
OUT2B
LOAD
OUT1B
LOAD
20
19
18
5
6
VBB2
VBB1
SUPPLY
1
SUPPLY
2
GND
GND
GND
GND
7
SENSE
2
17 SENSE
16 OUT1A
1
8
9
OUT2A
STEP
DIR
10
11
12
ENABLE
15
TRANSLATOR
& CONTROL
LOGIC
LOGIC
SUPPLY
VCC
14
13
MS1
MS2
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.
Dwg. PP-075-2
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Load Supply Voltage, VBB ............. 30 V
Output Current, IOUT
*
Continuous ..................... ±750 mA
Peak................................. ±850 mA
Logic Supply Voltage, VCC ........... 7.0 V
Logic Input Voltage Range, VIN
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
(tw >30 ns)............. -0.3 V to +7.0 V
(tw <30 ns)................ -1 V to +7.0 V
Sense Voltage, VSENSE ............... 0.68 V
Reference Voltage, VREF ................ VCC
Package Power Dissipation,
PD................................. See page 8
Operating Temperature Range,
TA ........................... -20°C to +85°C
Junction Temperature, TJ ......... +150°C
Storage Temperature Range,
TS ......................... -55°C to +150°C
Always order by complete part number:
* 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.
Part Number
Package
A3967SLB
A3967SLB-T
24-lead batwing SOIC
24-lead batwing SOIC; Lead-free