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A4980 Datasheet Preview

A4980 Datasheet

Automotive Programmable Stepper Driver

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A4980
Automotive, Programmable Stepper Driver
FEATURES AND BENEFITS
• Peak motor current up to ±1.4 A, 28 V
• Low RDS(on) outputs, 0.5 Ω source and sink, typical
• Automatic current decay mode detection/selection
• Mixed, Fast, and Slow current decay modes
• Synchronous rectification for low power dissipation
• Internal OVLO, UVLO, and Thermal Shutdown circuitry
• Crossover-current protection
• Short circuit, and open load diagnostics
• Hot and cold thermal warning
• Stall detect features
• SPI-compatible or simple Step and Direction motion
control
• Highly configurable via SPI-compatible serial interface
APPLICATIONS
• Automotive stepper motors
• Engine management
• Headlamp positioning
PACKAGE:
28-Pin TSSOP with Exposed Thermal Pad
(suffix LP)
Not to scale
Logic
Supply
Micro-
controller
or
ECU
CP1 2 VCP VBB
VDD
STEP
DIR
OAP
MS0
MS1
ENABLE
OAM
RESETn
DIAG
REF
SDI
SDO
SCK
STRn
VREG
OSC
OBP
OBM
SENSA
SENSB
AGND PGND
Automotive
12V Power Net
Stepper
Motor
DESCRIPTION
TheA4980 is a flexible microstepping motor driver with built-in
translator for easy operation. It is a single-chip solution, designed
to operate bipolar stepper motors in full-, half-, quarter- and
sixteenth-step modes, at up to 28 V and ±1.4 A. The A4980
can be controlled by simple Step and Direction inputs, or
through the SPI-compatible serial interface that also can be
used to program many of the integrated features and to read
diagnostic information.
The current regulator can be programmed to operate in fixed
off-time or fixed frequency PWM, with several decay modes
to reduce audible motor noise and increase step accuracy. In
addition the phase current tables can be programmed via the
serial interface to create unique microstep current profiles to
further improve motor performance for specific applications.
The current in each phase of the motor is controlled through a
DMOS full bridge, using synchronous rectification to improve
power dissipation. Internal circuits and timers prevent cross-
conduction and shoot-through, when switching between high-
side and low-side drives.
The outputs are protected from short circuits, and features
for low load current and stalled rotor detection are included.
Chip-level protection includes: hot and cold thermal warnings,
overtemperature shutdown, and overvoltage and undervoltage
lockout.
The A4980 is supplied in a 28-pin TSSOP power package with
an exposed thermal pad (package type LP). This package is
lead (Pb) free with 100% matte-tin leadframe plating.
Logic
Supply
Micro-
controller
or
ECU
CP1 2 VCP VBB
VDD
STEP
DIR
OAP
MS0
MS1
ENABLE
OAM
RESETn
DIAG
REF
SDI
SDO
SCK
STRn
VREG
OSC
OBP
OBM
SENSA
SENSB
AGND PGND
Automotive
12V Power Net
Stepper
Motor
Serial Interface Control
Typical Applications
A4980-DS, Rev. 4
Parallel Control




Allegro

A4980 Datasheet Preview

A4980 Datasheet

Automotive Programmable Stepper Driver

No Preview Available !

A4980
Automotive, Programmable Stepper Driver
SPECIFICATIONS
Selection Guide
Part Number
Packing*
A4980KLP-T
50 pieces per tube
A4980KLPTR-T
4000 pieces per reel
*Contact Allegrofor additional packing options
4.4 mm × 9.7 mm, 1.2 mm nominal height
TSSOP with exposed thermal pad
Absolute Maximum Ratings With respect to GND
Characteristic
Symbol
Notes
Load Supply Voltage
Logic Supply Voltage
Pin CP1
VBBx
VDD
Applies to VBBA and VBBB
Pins CP2, VCP
Pins STEP, DIR, ENABLE, DIAG
Pin VREG
Pin RESETn
Pin OSC
Can be pulled to VBB with 38 kΩ
Pins MS0, MS1
Pins SDI, SDO, SCK, STRn
Pin REF
Pins OAP, OAM, OBP, OBM
Pins SENSA, SENSB
Ambient Operating Temperature
Range
TA Range K; limited by power dissipation
Maximum Continuous Junction
Temperature
TJ(max)
Transient Junction Temperature
Overtemperature event not exceeding 10 s, lifetime
TtJ duration not exceeding 10 hours, guaranteed by design and
characterization
Storage Temperature Range
Tstg
Rating
–0.3 to 50
–0.3 to 6
–0.3 to VBB
–0.3 to VBB+8
–0.3 to 6
–0.3 to 8.5
–0.3 to 6
–0.3 to 6
–0.3 to 6
–0.3 to 6
–0.3 to 6
–0.3 to VBB
–0.3 to 1
–40 to 150
150
Unit
V
V
V
V
V
V
V
V
V
V
V
V
V
°C
°C
175
–55 to 150
°C
°C
Thermal Characteristics may require derating at maximum conditions
Characteristic
Symbol
Test Conditions*
Package Thermal Resistance
(Junction to Ambient)
RθJA
4-layer PCB based on JEDEC standard
2-layer PCB with 24.52 cm2 of copper area each side
Package Thermal Resistance
(Junction to Pad)
RθJP
*Additional thermal information available on the Allegro website
Value
28
32
2
Unit
ºC/W
ºC/W
ºC/W
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2


Part Number A4980
Description Automotive Programmable Stepper Driver
Maker Allegro
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A4980 Datasheet PDF






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