A1448 ALLEGRO [Allegro MicroSystems], A1448 Datasheet - Page 5

• Manufacturer Part Number: A1448
• Description: Low-Voltage, Full-Bridge Brushless DC Motor Driver with Integrated Hall Sensor IC, PWM Speed Control, Soft-Switching
• Manufacturer: ALLEGRO [Allegro MicroSystems]

A1448
Figure 2 shows a typical vibration motor application in which
speed control, active braking, and sleep mode are required on the
CONTROL pin.
Figure 3 shows an application circuit in which 100% duty cycle
is required. Tying the CONTROL pin to V
function and the sleep mode. The user must control supply in
order to control the speed of the motor. This represents a 2-wire
motor design.
Figure 2. Three-wire vibration motor application circuit
Figure 3. Two-wire vibration motor application circuit
System Logic
Control
DD
Integrated Hall Sensor IC, PWM Speed Control, Soft-Switching,
V
disables the braking
BATT
Application Information
I/O
C
Low-Voltage, Full-Bridge Brushless DC Motor Driver with
BYP
V
BATT
VDD
CONTROL
NC
C
and Reverse Battery and Short Circuit Protection
BYP
A1448
Note that:
• No external diode is required for reverse battery protection
• Thermal shutdown also is integrated, to protect the device
• A bypass capacitor of 0.1 μF is required. This capacitor is usu-
VDD
CONTROL
because the protection is fully integrated into the IC.
against inadvertent output shorts during manufacturing or
testing.
ally included on the end user PCB and therefore not necessary
on the motor PCB.
NC
VOUT2
VOUT1
GND
A1448
VOUT2
VOUT1
GND
M
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
M
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