Automotive Full Bridge MOSFET Driver
A3921
5
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
Characteristics Symbol Test Conditions Min. Typ. Max. Units
Gate Output Drive (continued)
Dead Time
2
t
DEAD
R
DEAD
= 3 kΩ – 180 – ns
R
DEAD
= 30 kΩ 815 960 1110 ns
R
DEAD
= 240 kΩ – 3.5 – μs
RDEAD tied to V5 – 6 – μs
Logic Inputs and Outputs
FF1 and FF2 Fault Output (Open Drain) V
FF(L)
I
FF
= 1 mA, fault not present – – 0.4 V
FF1 and FF2 Fault Output Leakage Current
3
I
FF(H)
V
FF
= 5 V, fault present –1 – 1 μA
RDEAD Current
3
I
DEAD
RDEAD = GND –200 – –70 μA
Input Low Voltage V
IN(L)
– – 0.8 V
Input High Voltage V
IN(H)
2.0 – – V
Input Hysteresis (Except RESET Pin) V
INhys
100 250 – mV
Input Hysteresis (RESET Pin) V
INRSThys
200 – – mV
Input Current (Except RESET Pin)
3
I
IN
0 V < V
IN
< V
5
–1 – 1 μA
Input Pulldown Resistor (RESET Pin) R
PD
–50–kΩ
RESET Pulse Time t
RES
0.1 – 3.5 μs
Protection
VREG Undervoltage Lockout Threshold
V
REGUVon
V
REG
rising 7.5 8 8.5 V
V
REGUVoff
V
REG
falling 6.75 7.25 7.75 V
Bootstrap Undervoltage Threshold V
BOOTUV
Cx with respect to Sx 59 – 69 %V
REG
Bootstrap Undervoltage Hysteresis V
BOOTUVhys
–13–%V
REG
V5 Undervoltage Turn-Off Threshold V
5UVoff
V
5
falling 3.4 3.6 3.8 V
V5 Undervoltage Hysteresis V
5UVhys
300 400 500 mV
VDSTH Input Range V
DSTH
0.1 – 2 V
VDSTH Input Current I
DSTH
0 V < V
DSTH
< 2 V – 10 30 μA
VDSTH Disable Voltage V
DSDIS
When not connected directly to V5 4.95 – – V
VDRAIN Input Voltage V
DRAIN
V
DSTH
= 2 V, V
BB
= 12 V, 7 V
BB
50 V
VDRAIN Input Current I
DRAIN
V
DSTH
= 2 V, V
BB
= 12 V,
0 V < V
DRAIN
< V
BB
– – 250 μA
Short-to-Ground Threshold Offset
4
V
STGO
High-side on, V
DSTH
≥ 1 V – ±100 – mV
High-side on, V
DSTH
< 1 V –150 ±50 150 mV
Short-to-Battery Threshold Offset
5
V
STBO
Low-side on, V
DSTH
≥ 1 V – ±100 – mV
Low-side on, V
DSTH
< 1 V –150 ±50 150 mV
Overtemperature Fault Flag Threshold T
JF
Temperature increasing 150 170 – ºC
Overtemperature Fault Hysteresis T
JFhys
Recovery = T
JF
– T
JFhys
–15–ºC
1
Functions correctly, but parameters are not guaranteed, below the general limits (7 V).
2
See Gate Drive Timing diagrams.
3
For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin.
4
As V
Sx
decreases, fault occurs if V
BAT
–V
Sx
> V
STG
. STG threshold, V
STG
= V
DSTH
+ V
STGO
.
5
As V
Sx
increases, fault occurs if V
Sx
– V
LSS
> V
STB
. STB threshold, V
STB
= V
DSTH
+V
STBO
.
ELECTRICAL CHARACTERISTICS (continued) valid at T
J
= –40°C to 150°C, V
BB
= 7 to 50 V, unless noted otherwise
