A4992 Datasheet, PDF (8/29 Pages) Allegro MicroSystems – Automotive Stepper Driver

A4992
Automotive Stepper Driver
ELECTRICAL CHARACTERISTICS (continued) Valid at T_J = –40°C to 150°C, V_BB = 7 to 28 V; unless otherwise specified
Characteristic
Symbol
Test Conditions
Min.
Typ.
Max.
Unit
Diagnostics and Protection
VBB Overvoltage Threshold
VBB Overvoltage Hysteresis
V_BBOV
V_BBOVHys
V_BB rising
32
34
36
V
2
–
4
V
VBB Undervoltage Threshold
V_BBUV V_BB falling
5.2
5.5
5.8
V
VBB Undervoltage Hysteresis
V_BBUVHys
VBB Power-On Reset Threshold
V_BBPOR V_BB falling
VBB Power-On Reset Hysteresis
V_BBPORHys
VREG Undervoltage Threshold – High V_REGUVH V_REG falling
VREG Undervoltage Hysteresis – High V_REGUVHHys
VREG Undervoltage Threshold – Low V_REGUVL V_REG falling
VREG Undervoltage Hysteresis – Low V_REGUVLHys
High-Side Overcurrent Threshold
I_OCH
Sampled after t_SCT
High-Side Current Limit
I_LIMH Active during t_SCT
Low-Side Overcurrent Sense Voltage
V_OCL Sampled after t_SCT
Overcurrent Fault Delay
t_SCT Default fault delay
Open Load Current Threshold Error
E_IOC
V_REF = 2 V
500
760
–
mV
–
2.8
3.0
V
50
100
–
mV
4.6
4.8
4.95
V
250
370
–
mV
3.2
3.35
3.5
V
100
230
–
mV
1.4
2.05
2.65
A
3
5.5
8
A
210
250
290
mV
1500
2000
2700
ns
–
–
±10
%
Hot Temperature Warning Threshold
T_JWH Temperature increasing
125
135
145
ºC
Hot Temperature Warning Hysteresis T_JWHHys
–
15
–
ºC
Overtemperature Shutdown
T_JF
Temperature increasing
155
170
–
ºC
Overtemperature Hysteresis
T_JHys Recovery = T_JF – T_JHys
–
15
–
ºC
1_{The term functional indicates operation is correct but parameters may not be within specification above or below the general limits (7 to 28 V). Outputs}
not operational above V_BBOV or below V_REGUVL.
2_{For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin.}
3_{Assumes a 4 MHz clock.}
4_{Current Trip Point Error is the difference between the actual current trip point and the target current trip point, referred to maximum full scale (100%)}
current: E_Trip = 100 × ( I_TripActual – I_TripTarget ) / I_{FullScale% }.
Allegro MicroSystems, LLC
8
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com