A3976KLB Allegro Microsystems Inc, A3976KLB Datasheet - Page 2

• Manufacturer Part Number: A3976KLB
• Manufacturer: Allegro Microsystems Inc

Specifications of A3976KLB

• Operating Current: 50mA
• Operating Temperature Classification: Commercial
• Package Type: SOIC W
• Operating Supply Voltage (min): 4.5V
• Operating Supply Voltage (max): 5.5V
• Lead Free Status / Rohs Status: Not Compliant

Operating Supply Voltage, V
Non-Operating Supply Voltage .................... 35 V
Output Current, I
Logic Supply Voltage, V
Fault Output Voltage ................................... 7.0 V
Logic Input Voltage Range,
Package Power Dissipation (T A = +25°C), P
Operating Temperature Range,
Junction Temperature, T
Storage Temperature Range,
* Output current rating may be limited by duty cycle,
ambient temperature, and heat sinking. Under any set of
conditions, do not exceed the specified current rating or a
junction temperature of 150°C.
PRELIMINARY DATASHEET - 8/24/04
(Subject to change without notice)
ENABLE1
GROUND
GROUND
PHASE1
FAULT1
ABSOLUTE MAXIMUM RATINGS
OUT1A
OUT1B
V
V
NC
NC
n/c
n/c
IN
BB
A3976KLB.................................. 2.2 W
T
T
A
S
......................... -0.3 V to V
1 0
1 1
1 2
1
2
3
4
5
6
7
8
9
.............................. -40°C to +125°C
.............................. -55°C to +150°C
OUT
at T A = +25°C
A 3 9 7 6 K L B
............................±500 mA*
J
CC
......................... +150°C
.......................... 7.0 V
BB
.................... 27 V
2 4
2 3
2 2
2 1
2 0
1 9
1 8
1 7
1 6
1 5
1 4
1 3
CC
V
ENABLE2
PHASE2
NC
NC
GROUND
GROUND
n/c
OUT2A
n/c
FAULT2
OUT2B
+ 0.3 V
CC
D
motor or bidirectionally control two DC Motors. Both H-Bridges are capable
of continuous output currents of up to +/- 500 mA and operating voltages to
27V. Free wheeling, substrate isolated diodes are included for output transient
suppression when switching motors or other inductive loads. For each bridge
the PHASE input controls load current polarity by selecting the appropriate
source and sink driver pair. The ENABLE input, when held high, enables the
respective output H-bridge. When both ENABLE pins are held low the device
will enter SLEEP mode and consume less than 100 µ A.
environments and was designed specifically for automotive applications.
Protection circuitry will check for open or shorted load, motor lead short to
ground or supply, VBB overvoltage, VCC undervoltage, and thermal
shutdown. If any of these conditions are detected the outputs will be disabled
and fault information will be output to diagnostic pins FAULT1 and FAULT2.
batwing tab (suffix ‘LB’).
FEATURES
3976
DUAL FULL BRIDGE
PROTECTED MOTOR DRIVER
±500 mA Continuous Output Rating
35V Load Dump Survival
Output Short Circuit Protection
Coded Fault Diagnostic Outputs
Low Current Standby Mode
Open Load Monitor
Low Current Standby Mode
VBB Over Voltage Shutdown
Internal Thermal Shutdown Circuitry
Internal Low Parasitic Free Wheeling Diodes
Crossover Current Protection
The A3976 is designed to drive both windings of a bipolar stepper
The A3976 is protected to ensure safe operation in harsh operating
The A3976 is supplied in a 24-lead plastic SOIC with a copper
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