ALLEGRO 3966 DATA SHEET

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A3966SLB (SOIC)

OUT

PHASE

ENABLE

GROUND

SENSE

OUT

LOAD

SUPPLY

REFERENCE

1

1A

V

2

1

3

1

4

5

1

6

1B

710

V

89

REF

BB

LOGICLOGIC

V

BB

16

OUT

2A

PHASE

15

14

13

12

11

V

CC

RC

ENABLE

GROUND

SENSE

OUT

2B

LOGIC
SUPPLY

RC

Dwg. PP-066-1

2

2

2

ABSOLUTE MAXIMUM RATINGS

Load Supply Voltage, VBB...................... 30 V

Output Current, I

(continuous) .............................. ±650 mA

Logic Supply Voltage, V
Input Voltage, V
Sense Voltage, V
Package Power Dissipation (T

A3966SA ..................................... 2.08 W*

A3966SLB ................................... 1.87 W*

Operating Temperature Range,

T

..................................... -20°C to +85°C

A

Junction Temperature,

T

.................................................. +150°C

J

Storage Temperature Range,

T

................................... -55°C to +150°C

S

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.

* Per SEMI G42-88 Specification, Thermal Test Board

Standardization for Measuring Junction-to-Ambient
Thermal Resistance of Semiconductor Packages.

(peak) ........... ±750 mA

OUT

.................... 7.0 V

CC

........ -0.3 V to VCC + 0.3 V

in

................................ 1.0 V

S

= 25°C), P

A

D

29319.25C

3966

DUAL FULL-BRIDGE PWM

MOTOR DRIVER

The A3966SA and A3966SLB are designed to drive both windings of a two­phase bipolar stepper motor. Each device includes two H-bridges capable of
continuous output currents of ±650 mA and operating voltages to 30 V. Motor
winding current can be controlled by the internal fixed-frequency, pulse-width
modulated (PWM), current-control circuitry. The peak load current limit is set
by the user’s selection of a reference voltage and current-sensing resistors.
Except for package style and pinout, the two devices are identical.

The fixed-frequency pulse duration is set by a user-selected external RC timing
network. The capacitor in the RC timing network also determines a user­selectable blanking window that prevents false triggering of the PWM current­control circuitry during switching transitions.

To reduce on-chip power dissipation, the H-bridge power outputs have been
optimized for low saturation voltages. The sink drivers feature the Allegro
patented Satlington® output structure. The Satlington outputs combine the low
voltage drop of a saturated transistor and the high peak current capability of a
Darlington.

For each bridge, a PHASE input controls load-current polarity by selecting the
appropriate source and sink driver pair. For each bridge, an ENABLE input, when
held high, disables the output drivers. Special power-up sequencing is not
required. Internal circuit protection includes thermal shutdown with hysteresis,
ground-clamp and flyback diodes, and crossover-current protection.

The A3966SA is supplied in a 16-pin dual in-line plastic package. The
A3966SLB is supplied in a 16-lead plastic SOIC with copper heat sink tabs. The
power tab is at ground potential and needs no electrical isolation. The A3966SLB
is also available in a lead (Pb) free version, with 100% matte tin leadframe plating.

FEATURES

■ ±650 mA Continuous Output Current

■ 30 V Output Voltage Rating

■ Internal Fixed-Frequency PWM Current Control

■ Satlington Sink Drivers

■ User-Selectable Blanking Window

■ Internal Ground-Clamp & Flyback Diodes

■ Internal Thermal-Shutdown Circuitry

■ Crossover-Current Protection and UVLO Protection

Always order by complete part number:

Part Number Pb-free Packing Package R

A3966SA – Bulk 16-pin DIP 60 38 —
A3966SLB – Bulk
A3966SLB-T Yes Bulk 16-lead SOIC 67 — 6
A3966SLBTR – Tape and Reel with internally
A3966SLBTR-T Yes Tape and Reel fused leads

R

θθ

θJA

θθ

(°C/W)

θθ

θJC

θθ

R

θθ

θJT

θθ

Data Sheet

®

3966

DUAL FULL-BRIDGE
PWM MOTOR DRIVER

LOGIC

SUPPLY

V

CC

PHASE

1

1

FUNCTIONAL BLOCK DIAGRAM

1A

1B

OUT

OUT

V

BB

2A

OUT

2B

OUT

LOAD

SUPPLY

+

PHASE

2

2

ENABLE

R

T

UVLO

& TSD

1

CONTROL LOGIC

1

SOURCE

ENABLE

RC

C

T

SENSE

OUT

LOAD

SUPPLY

REFERENCE

RC

LOGIC

SUPPLY

OUT

SENSE

PWM LATCH

Q

OSC

BLANKING

1

R

S

A3966SA (DIP)

1

1

2

1B

3

V

4

REF

RC

5

V

6

CC

7

2B

8

2

GATE

CURRENT-SENSE

1

LOGIC

V

BB

LOGIC

COMPARATOR

+
–

16

15

14

13

12

11

10

9

1

ENABLE

PHASE

OUT

GROUND

GROUND

OUT

PHASE

ENABLE

UVLO
& TSD

CONTROL LOGIC

ENABLE

2

÷4

REFERENCE

CURRENT-SENSE

COMPARATOR

+
–

2

BLANKING

GATE

2

PWM LATCH

R

S

2

2

SOURCE

ENABLE

Q

GROUND

Dwg. FP-036-6

SENSE

R

1S

SENSE

1

2

R

2S

TRUTH TABLE

PHASE ENABLE OUT

1

1

1A

XH OffOff
HL H L
LL L H

X = Irrelevant

2A

2

2

OUT

A

B

Dwg. PP-066-2

2

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]
Copyright © 1998, 2003 Allegro MicroSystems, Inc.

3966

DUAL FULL-BRIDGE

PWM MOTOR DRIVER

ELECTRICAL CHARACTERISTICS at T
V

= 0 V, 56 kΩ & 680 pF RC to Ground (unless noted otherwise)

S

= +25°C, V

A

= 30 V, VCC = 4.75 V to 5.5 V, V

BB

REF

= 2 V,

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Output Drivers

Load Supply Voltage Range V

Output Leakage Current I

Output Saturation Voltage V

CE(SAT)

Clamp Diode Forward Voltage V

Motor Supply Current I
(No Load)

BB(ON)

I

BB(OFF)

BB

CEX

F

Operating, I

V

= 30 V — <1.0 50 µA

OUT

V

= 0 V — <-1.0 -50 µA

OUT

Source Driver, I

Source Driver, I

Sink Driver, I

Sink Driver, I

= ±650 mA, L = 3 mH V

OUT

= -400 mA — 1.7 2.0 V

OUT

= -650 mA — 1.8 2.1 V

OUT

= +400 mA, VS = 0.5 V — 0.3 0.5 V

OUT

= +650 mA, VS = 0.5 V — 0.7 1.3 V

OUT

CC

—30 V

IF = 400 mA — 1.1 1.4 V

IF = 650 mA — 1.4 1.6 V

V

V

ENABLE1

ENABLE1

= V

= V

= 0.8 V — 3.0 5.0 mA

ENABLE2

= 2.4 V — <1.0 200 µA

ENABLE2

Control Logic

Logic Supply Voltage Range V

Logic Input Voltage V

V

Logic Input Current I

I

Reference Input Volt. Range V

Reference Input Current I

Reference Divider Ratio V

REF/VTRIP

Current-Sense Comparator V

CC

IN(1)

IN(0)

IN(1)

IN(0)

REF

REF

IO

Operating 4.75 — 5.50 V

V

IN

V

IN

Operating 0.1 – 2.0 V

V

REF

Input Offset Voltage

Current-Sense Comparator V

S

Operating -0.3 — 1.0 V

Input Voltage Range

Sense-Current Offset I

SO

IS – I

NOTES: 1. Typical Data is for design information only.

2. Negative current is defined as coming out of (sourcing) the specified device terminal.

2.4 — — V

— — 0.8 V

= 2.4 V — <1.0 20 µA
= 0.8 V — <-20 -200 µA

-2.5 0 1.0 µA

3.8 4.0 4.2 —

= 0 V -6.0 0 6.0 mV

, 50 mA ≤ I

OUT

≤ 650 mA 12 18 24 mA

OUT

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