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3974 Datasheet(HTML) 1 Page - Allegro MicroSystems

Part No. 3974
Description  DMOS DUAL FULL-BRIDGE PWM MOTOR DRIVER
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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3974 Datasheet(HTML) 1 Page - Allegro MicroSystems

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3974
DMOS DUAL FULL-BRIDGE PWM MOTOR DRIVER
Designed for pulse-width modulated (PWM) current control
of two dc motors, the A3974SED is capable of output currents to
±1.5 A and operating voltages to 50 V. Internal fixed off-time
PWM current-control timing circuitry can be programmed via a
serial interface to operate in slow, fast, and mixed current-decay
modes.
Independant ENABLE input terminals are provided for use in
controlling the speed and torque of each dc motor with externally
applied PWM control signals.
Synchronous rectification circuitry allows the load current to
flow through the low
rDS(on) of the DMOS output driver during
the current decay. This feature will eliminate the need for
external clamp diodes in most applications, saving cost and
external component count, while minimizing power dissipation.
Internal circuit protection includes thermal shutdown with
hysteresis, undervoltage monitoring of VDD and the charge
pump, and crossover-current protection. Special power-up
sequencing is not required.
The A3974SED is supplied in a 44-lead plastic PLCC with
four copper batwing tabs for maximum heat dissipation. The
power tabs are at ground potential and need no electrical isola-
tion.
FEATURES
±1.5 A, 50 V Continuous Output Rating
Low
r
DS(on) DMOS Output Drivers
Programmable Slow, Fast, and Mixed Current-Decay Modes
Serial-Interface Controls Chip Functions
Synchronous Rectification for Low Power Dissipation
Internal UVLO and Thermal Shutdown Circuitry
Crossover-Current Protection
Sleep and Idle Modes
ABSOLUTE MAXIMUM RATINGS
at TA = +25°C
Load Supply Voltage, V
BB ............................ 50 V
Output Current, I
OUT .................................. ±1.5 A
Logic Supply Voltage, V
DD .......................... 7.0 V
Logic Input Voltage Range, V
IN
Continous ................... -0.3 V to VDD + 0.3 V
t
W < 30 ns ................... -1.0 V to VDD + 1.0 V
Reference Voltage, V
REF ................................. 3 V
Sense Voltage (dc), V
S
Continous .............................................. 0.5 V
t
W < 1 µs ................................................ 2.5 V
Package Power Dissipation, P
D .................. 3.9 W
Operating Temperature Range,
T
A ......................................... -20°C to +85°C
Junction Temperature, T
J ......................... +150°C
Storage Temperature Range,
T
S ....................................... -55°C to +150°C
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.
7
8
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29
30
39
38
37
36
35
34
33
32
31
Dwg. PP-073
GND
GND
LOGIC
SUPPLY
NC
STROBE
CLOCK
DATA
GND
GND
REF1
REF2
NC
NC
VREG
SLEEP
OSC
GND
GND
CP
CP1
CP2
NC
PROGRAM
PWM TIMER
÷
VDD
VBB1
VBB2
÷
LOGIC
LOGIC
PROGRAM
PWM TIMER
Selection Guide
Part Number
Pb-free*
Package
Packing
A3974SED-T
Yes
44-pin PLCC
27 per tube
A3974SEDTR-T
Yes
44-pin PLCC
450 per reel
*Pb-based variants are being phased out of the product line. The variants cited in
this footnote are in production but have been determined to be LAST TIME BUY.
This classification indicates that sale of this device is currently restricted
to existing customer applications. The variants should not be purchased for new
design applications because obsolescence in the near future is probable. Samples
are no longer available. Status change: October 31, 2006. Deadline for LAST TIME
BUY orders: April 27, 2007. These variants include: A3974SED and A3974SEDTR.
.


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