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A3980

Automotive DMOS Microstepping Driver with Translator

Features and Benefits

▪

Typical application up to ±1 A, 35 V output rating

Low R

DS(ON)

outputs, 0.67

Ω

source, 0.54

Ω

sink typical

Automatic current decay mode detection/selection

3.0 V to 5.5 V logic supply voltage range

Mixed, fast, and slow current decay modes

Synchronous rectification for low power dissipation

Internal OVLO, UVLO, and thermal shutdown circuitry

Crossover current protection

Short to supply/ground and short/low load current

diagnostics

Description

The A3980 is a complete microstepping motor driver with

built-in translator for easy operation. It is designed to operate

bipolar stepper motors in full-, half-, eighth-, and sixteenth-

step modes, at up to 35 V and ±1 A. The A3980 includes a

fixed off-time current regulator which has the ability to operate

in slow, fast, or mixed decay modes. This results in reduced

audible motor noise, increased step accuracy, and reduced

power dissipation.

The translator is the key to the easy implementation of the

A3980. Simply inputting one pulse on the step input drives

the motor one microstep. There are no phase sequence tables,

high frequency control lines, or complex interfaces to program.

The A3980 interface is an ideal fit for applications where a

complex

μP

is unavailable or overburdened.

Internal synchronous rectification control circuitry is provided

to improve power dissipation during PWM operation.

Internal circuit protection includes: thermal shutdown with

hysteresis, overvoltage lockout (OVLO), undervoltage lockout

(UVLO), and crossover current protection. Special power-up

sequencing is not required. In addition, two diagnostic fault flags

provide indication of shorts or opens on the motor windings.

The A3980 is supplied in a low-profile (1.1 mm) 28L TSSOP

with exposed thermal pad. This device is available also in a

lead-free version (leadframe plating 100% matte tin).

Package: 28 pin TSSOP with exposed

thermal pad (suffix LP)

Approximate Size

Typical Application

26184.26C

A3980

Automotive DMOS Microstepping Driver

with Translator

Selection Guide

Part Number

A3980KLP

A3980KLP-T

A3980KLPTR

A3980KLPTR-T

Pb-free

–

Yes

–

Yes

Packing

50 pieces per tube

4000 pieces per reel

Absolute Maximum Ratings

Characteristic

Load Supply Voltage

Logic Supply Voltage

Logic Input Voltage

Sense Voltage

Reference Voltage

Operating Ambient Temperature

Maximum Junction Temperature

Storage Temperature

ESD Rating - Human Body Model

ESD Rating - Charged Device Model

Symbol

V

BB

V

DD

V

IN

V

SENSE

V

REF

T

A

T

J

(max)

T

stg

Range K

(t

W

< 30 ns)

500 ms

Notes

Rating

50

7.0

–0.3 to V

DD

+ 0.3

–1.0 to V

DD

+ 1

0.5

0 to V

DD

–40 to 125

150

–55 to 150

Units

V

°C

kV

AEC-Q100-002, all pins

AEC-Q100-011, all pins

2.0

1.0

Thermal Ratings

Characteristic

Package Thermal Resistance

Symbol

R

θJA

Test Conditions*

Value Units

2-layer PCB with 3.8 in.

2

of copper area each side

32

ºC/W

connected by thermal vias

4-layer PCB based on JEDEC standards

*Additional thermal information available on Allegro Web site.

28

ºC/W

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

2

A3980

Automotive DMOS Microstepping Driver

with Translator

Functional Block Diagram

C

CP

VREG

5V

VDD

V

REF

SENSE 1

CP2

CP1

VCP

Charge

Pump

C

CS

Voltage

Regulator

DAC

VBATT

VBB1

STEP

DIR

MS1

MS2

Translator

OUT1A

OUT1B

RC1

PWM Latch

Blanking

Mixed Decay

Gate

Drive

Control

Logic

DMOS Full Bridge

SENSE1

R

T1

C

T1

SR

SLEEP

ENABLE

VBB2

R

S1

OUT2A

OUT2B

PFD

RC2

PWM Latch

Blanking

Mixed Decay

SENSE2

R

T2

C

T2

DAC

OVLO

UVLO

OVERTEMP

SHORT SENSE

OPEN SENSE

VDD

VCP

VBB

OUT1A/1B

OUT2A/2B

SENSE1

SENSE2

R

S2

SENSE 2

V

REF

AGND

REF

FF1

FF2

PGND

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

3

A3980

Automotive DMOS Microstepping Driver

with Translator

ELECTRICAL CHARACTERISTICS

at T

J

= –40°C to +150ºC, V

BB

= 14 V, V

DD

= 3.0 to 5.5 V (unless otherwise noted)

Characteristics

Output Drivers

Load Supply Voltage Range

V

BB

Driving

Operating

Sleep mode

V

OUT

= V

BB

V

OUT

= 0 V

Source driver, I

OUT

= –1 A, T

A

< 25ºC

Sink driver, I

OUT

= 1 A, T

A

< 25ºC

Source driver, I

OUT

= –1 A, T

A

< 125ºC

Sink driver, I

OUT

= 1 A, T

A

< 125ºC

Source diode, I

F

= –1 A

Sink diode, I

F

= 1 A

f

PWM

< 50 kHz

Operating, outputs disabled

Sleep mode

f

PWM

< 50 kHz

Outputs off

Sleep mode

8

7

0

Symbol

Test Conditions

Min.

Typ.

1

Max.

V

OVB

50

35

20

–20

0.86

0.65

1.06

0.83

1.4

8

6

20

12

10

20

Units

–

< 1.0

0.51

0.45

0.87

0.72

V

Output Leakage Current

2

I

DSS

–

μA

Ω

V

mA

μA

mA

μA

Output-On Resistance

R

DSON

Body Diode Forward Voltage

V

F

I

BB

–

Motor Supply Current

Logic Supply Current

I

DD

Logic Interface

Logic Supply Voltage Range

Input Low Voltage

Input High Voltage

Input Hysteresis

Input Current

2

Output Low Voltage

Output High Voltage

STEP Pin Low

STEP Pin High

Setup Time for Input Change to STEP

Hold Time for Input Change from STEP

Wake-Up Time from SLEEP

V

DD

V

IL

V

IH

V

IHYS

I

IN

V

OL

V

OH

t

STPL

t

STPH

t

SU

t

H

t

EN

Operating

3.0

5.0

5.5

0.3 V

DD

V

mV

μA

V

μs

ns

ms

–

I

O

= 3 mA

I

O

= –200

μA

–

0.7 V

DD

200

–20

–

300

< ±1

–

500

20

0.4

–

2.8

1

200

–

MS1, MS2, DIR

–

1

Continued on next page

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

4

A3980

Automotive DMOS Microstepping Driver

with Translator

ELECTRICAL CHARACTERISTICS

(continued) at T

J

= –40°C to +150ºC, V

BB

= 14 V, V

DD

= 3.0 to 5.5 V (unless otherwise noted)

Characteristics

Current Control

Blank Time

Fixed Off Time

Mixed Decay Trip Points

Crossover Dead Time

Recommended Reference Input Voltage

Reference Input Current

2

Current Trip-Level Error

3

Thermal Protection

Thermal Shutdown

Thermal Shutdown Hysteresis

Diagnostics

Max V

DS

on High-Side Bridge FETs

Max V

DS

on Low-Side Bridge FETs

V

DS

Fault Measurement Delay

Minimum Load Current

V

BB

Overvoltage Lockout

V

BB

Overvoltage Lockout Hysteresis

V

REG

Undervoltage Lockout

V

DD

Enable Threshold

V

DD

Enable Threshold Hysteresis

V

DSHT

V

DSLT

t

SCT

I

OC

V

OVB

V

OVBH

V

UVR

V

UVD

V

UVDH

Sampled after t

BLANK

+ t

SCT

Sampled after t

BLANK

+ t

SCT

T

SD

T

SDH

t

BLANK

t

OFF

PFD

H

PFD

L

t

DT

V

REF

I

REF

err

I

R

T

= 56 K , C

T

= 680 pF

R

T

= 56 K , C

T

= 680 pF

700

30

950

38

0.60 V

DD

0.21 V

DD

475

1200

46

ns

μs

V

ns

V

μA

%

Symbol

Test Conditions

Min.

Typ.

1

Max.

Units

–

2 V < V

REF

< 4 V, %I

TripMAX

= 38%

2 V < V

REF

< 4 V, %I

TripMAX

= 70%

2 V < V

REF

< 4 V, %I

TripMAX

= 100%

–

100

0.8

–3

–

800

4

3

±15

±10

±5

–

0

–

160

170

15

180

ºC

–

32

2

5.3

2.45

50

–

36

4

6.0

2.95

1.5

700

35

34

V

ns

%

V

mV

–

w.r.t. I

TRIPMAX

at Home position

V

BB

rising

–

V

REG

falling

V

DD

rising

–

5.7

2.7

100

–

1

Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions. Performance may vary

for individual units, within the speciﬁed maximum and minimum limits.

2

Negative current is deﬁned as coming out of (sourcing from) the speciﬁed device pin.

3

err = (I

I

TripMAX

.

I

Trip

– I

Prog

)

⁄

I

Prog

, where I

Prog

= %I

TripMAX

×

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

5

A3980_06

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