A3955
Full-Bridge PWM Microstepping Motor Driver
ELECTRICAL CHARACTERISTICS (continued) at T
A
= 25°C, V
BB
= 5 V to 50 V, V
CC
= 4.5 V to
5.5 V (unless otherwise noted. )
Limits
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Units
Control Circuitry
Logic Supply Voltage Range
Reference Voltage Range
UVLO Enable Threshold
UVLO Hysteresis
Logic Supply Current
Logic Input Voltage
Logic Input Current
Mixed-Decay Comparator
Trip Points
I
CC(ON)
I
CC(OFF)
V
IN(1)
V
IN(0)
I
IN(1)
I
IN(0)
V
PFD
V
IN
= 2.0 V
V
IN
= 0.8 V
Slow Current-Decay Mode
Mixed Current-Decay Mode
Fast Current-Decay Mode
Mixed-Decay Comparator
Input Offset Voltage
Mixed-Decay Comparator
Hysteresis
Reference Input Current
Reference Divider Ratio
Digital-to-Analog Converter
Accuracy*
Current-Sense Comparator
Input Offset Voltage*
Step Reference
Current Ratio
V
IO(PFD)
∆V
IO(PFD)
I
REF
V
REF
/V
S
—
V
IO(S)
SRCR
V
REF
= 0 V to 2.5 V
at trip, D
0
= D
1
= D
2
= 2 V
1.0 V < V
REF
2.5 V
0.5 V < V
REF
1.0 V
V
REF
= 0 V
D
0
= D
1
= D
2
= 0.8 V
D
0
= 2 V, D
1
= D
2
= 0.8 V
D
0
= 0.8 V, D
1
= 2 V, D
2
= 0.8 V
D
0
= D
1
= 2 V, D
2
= 0.8 V
D
0
= D
1
= 0.8 V, D
2
= 2 V
D
0
= 2 V, D
1
= 0.8 V, D
2
= 2 V
D
0
= 0.8 V, D
1
= D
2
= 2 V
D
0
= D
1
= D
2
= 2 V
D
0
= D
1
= D
2
= 0.8 V
V
CC
V
REF
Operating
Operating
V
CC
= 0
→
5 V
4.5
0.5
3.35
0.30
—
—
2.0
—
—
—
3.5
1.1
—
—
5.0
—
—
—
—
—
—
—
—
—
—
—
—
—
5.0
—
3.70
0.45
42
12
—
—
<1.0
<-2.0
—
—
—
0
25
—
3.0
—
—
—
0
19.5
38.2
55.5
70.7
83.1
92.4
100
5.5
2.5
4.05
0.60
50
16
—
0.8
20
-200
—
3.1
0.8
±20
55
±5.0
—
±3.0
±4.0
±5.0
—
—
—
—
—
—
—
—
V
V
V
V
mA
mA
V
V
μA
μA
V
V
V
mV
mV
μA
—
%
%
mV
%
%
%
%
%
%
%
%
Continued next page…
* The total error for the V
REF
/V
S
function is the sum of the D/A error and the current-sense comparator input offset voltage.
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
