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A3950 Datasheet(PDF) 4 Page - Allegro MicroSystems

Part No. A3950
Description  DMOS Full-Bridge Motor Driver
Download  12 Pages
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Manufacturer  ALLEGRO [Allegro MicroSystems]
Direct Link  http://www.allegromicro.com
Logo ALLEGRO - Allegro MicroSystems

A3950 Datasheet(HTML) 4 Page - Allegro MicroSystems

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DMOS Full-Bridge Motor Driver
A3950
4
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
ELECTRICAL CHARACTERISTICS at TJ = 25°C, VBB = 8 to 36 V, unless noted otherwise
Characteristics
Symbol
Test Conditions
Min.
Typ.
Max. Units
Motor Supply Current
IBB
fPWM < 50 kHz
6
8.5
mA
Charge pump on, outputs disabled
3
4.5
mA
Sleep mode
10
μA
PHASE, ENABLE, MODE Input
Voltage
VIH
2.0
V
VIL
0.8
V
SLEEP Input Voltage
VIH
2.7
V
VIL
0.8
V
PHASE, MODE Input Current1
IIH
VIN = 2.0 V
<1.0
20
μA
IIL
VIN = 0.8 V
–20 <–2.0
20
μA
ENABLE Input Current
IIH
VIN = 2.0 V
40
100
μA
IIL
VIN = 0.8 V
16
40
μA
SLEEP Input Current
IIH
VIN = 2.7 V
27
50
μA
IIL
VIN = 0.8 V
<1
10
μA
NFAULT Output Voltage
VOL
Isink = 1.0 mA
0.4
V
Input Hysteresis, except SLEEP
VIHys
100
150
250
mV
Output On Resistance
RDS(on)
Source driver, IOUT = -2.8 A, TJ=25°C
0.35
0.48
Ω
Source driver, IOUT = -2.8 A, TJ=125°C
0.55
0.8
Ω
Sink driver, IOUT = 2.8 A, TJ=25°C
0.3
0.43
Ω
Sink driver, IOUT = 2.8 A, TJ=125°C
0.45
0.7
Ω
Body Diode Forward Voltage1
Vf
Source diode, If = –2.8 A
1.4
V
Sink diode, If = 2.8 A
1.4
V
Propagation Delay Time
tpd
PWM, change to source or sink ON
600
ns
PWM, change to source or sink OFF
100
ns
Crossover Delay
tCOD
500
ns
Protection Circuitry
UVLO Threshold
VUV
VBB increasing
6.5
V
UVLO Hysteresis
VUVHys
250
mV
Overcurrent Threshold2
IOCP
3––
A
Overcurrent Protection Period
tOCP
1.2
ms
Thermal Warning Temperature
TJW
Temperature increasing
160
°C
Thermal Warning Hysteresis
TJWHys
Recovery = TJW – TJWHys
–15–°C
Thermal Shutdown Temperature
TJTSD
Temperature increasing
175
°C
Thermal Shutdown Hysteresis
TJTSDHys Recovery = TJTSD – TJTSDHys
–15–°C
1For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin.
2Overcurrent protection is tested at 25°C in a restricted range and guaranteed by characterization.
THERMAL CHARACTERISTICS may require derating at maximum conditions, see application information
Characteristic
Symbol
Test Conditions*
Value
Units
Package Thermal Resistance
RθJA
Preliminary: EU package, 4-layer PCB based on JEDEC standard
30
ºC/W
LP package, 4-layer PCB based on JEDEC standard
34
ºC/W
LP package, 2-layer PCB with 3.8 in.2 copper both sides, connected by
thermal vias
43
ºC/W
*Additional thermal data available on the Allegro Web site.


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