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| A3949 Datasheet, PDF (1/7 Pages) Allegro MicroSystems – DMOS Full-Bridge Motor Driver | |||
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A3949
DMOS Full-Bridge Motor Driver
Features and Benefits
⪠Single supply operation
⪠Very small outline package
⪠Low RDS(ON) outputs
⪠Sleep function
⪠Internal UVLO
⪠Crossover current protection
⪠Thermal shutdown protection
Packages:
Package LB, 16-pin SOIC
with internally fused pins
Description
Designed for PWM (pulse width modulated) control of DC
motors, the A3949 is capable of peak output currents to ±2.8 A
and operating voltages to 36 V.
PHASE and ENABLE input terminals are provided for use
in controlling the speed and direction of a DC motor with
externally applied PWM control signals. Internal synchronous
rectification control circuitry is provided to reduce power
dissipation during PWM operation.
Internal circuit protection includes thermal shutdown with
hysteresis, undervoltage monitoring of V and V , and
BB
CP
crossover current protection.
TheA3949 is supplied in a power package, a 16-pin plastic SOIC
with a copper batwing tab (part number suffix LB). The packages
are lead (Pb) free, with 100% matte tin leadframes.
Not to scale
Functional Block Diagram
.22 μF
25 V
VREG
0.1 μF
CP1
CP2
MODE
PHASE
ENABLE
SLEEP
Low Side
Gate Supply
OSC
Charge
Pump
Control
Logic
DMOS Full Bridge
VCP
VBB
0.1 μF
Load
Supply
0.1 μF
100 μF
OUTA
OUTB
SENSE
GND
GND
29319.47i
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