Data Sheet26184.26A
A3980
Automotive DMOS Microstepping Driver with Translator
The A3980 is a complete microstepping motor driver with built-in
translator for easy operation. It is designed to operate bipolar stepper
motors in full-, half-, eighth-, and sixteenth-step modes, at up to 35 V
and ±1 A. The A3980 includes a fi xed off-time current regulator which
has the ability to operate in slow, fast, or mixed decay modes. This
results in reduced audible motor noise, increased step accuracy, and
reduced power dissipation.
The translator is the key to the easy implementation of the A3980.
Simply inputting one pulse on the step input drives the motor one
microstep. There are no phase sequence tables, high frequency control
lines, or complex interfaces to program. The A3980 interface is an ideal
fi t for applications where a complex µP is unavailable or overburdened.
Internal synchronous rectifi cation control circuitry is provided to
improve power dissipation during PWM operation.
Internal circuit protection includes: thermal shutdown with hysteresis,
overvoltage lockout (OVLO), undervoltage lockout (UVLO), and
crossover current protection. Special power-up sequencing is not
required. In addition, two diagnostic fault fl ags provide indication of
shorts or opens on the motor windings.
The A3980 is supplied in a low-profi le (1.1 mm) 28L TSSOP with
exposed thermal pad (part number suffi x LP).
null Typical application up to ±1 A, 35 V output rating
null Low R
DS(ON)
outputs, 0.67 Ω source, 0.54 Ω sink typical
null Automatic current decay mode detection/selection
null 3.0 V to 5.5 V logic supply voltage range
null Mixed, fast, and slow current decay modes
null Synchronous rectifi cation for low power dissipation
null Internal OVLO, UVLO, and thermal shutdown circuitry
null Crossover current protection
null Short to supply/ground and short/open load diagnostics
Use the following complete part number when ordering:
AB SO LUTE MAX I MUM RAT INGS
Part Number Package Description
A3980KLP 28-pin, TSSOP Exposed thermal pad
Load Supply Voltage, 500 ms,V
BB
.....................50 V
Logic Supply Voltage, V
DD
................................7.0 V
Logic Input Voltage
V
IN
................................. –0.3 V to V
DD
+ 0.3 V
(t
W
< 30 ns) ....................... –1.0 V to V
DD
+ 1 V
Sense Voltage, V
SENSE
.......................................0.5 V
Reference Voltage, V
REF
………............. 0 V to V
DD
Package Power Dissipation (T
A
= +25ºC), P
D
"High-K" PCB
1
..............................R
θJA
28ºC/W
Typical PCB
2
..................................R
θJA
38ºC/W
Operating Temperature Range
Junction Temperature, T
J
...........–40°C to +150°C
Storage Temperature, T
S
..........–55°C to +150°C
1
Measured on a JEDEC-standard "High-K" 4-layer PCB.
2
Measured on a typical two-sided PCB with 3 in.
2
copper
ground area.
Package LP
FEATURES
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Transl
at
or
&
C
ontrol
Logi
cPWM
Ti
mer
Reg
Ch
a
r
g
e
Pu
m
p
÷8
VDD
VBB1
VBB2
SENSE1
SR
DIR
OUT1A
PFD
RC1
AGND
REF
RC2
VDD
OUT2A
MS2
MS1
SENSE2
VBB1
SLEEP
ENABLE
OUT1B
CP2
CP1
VCP
PGND
VREG
STEP
OUT2B
FF2
FF1
VBB2
APPLICATIONS
null Automotive stepper motors
null Engine management
null Headlamp positioning
Approximate Scale 1:1