A1448 ALLEGRO [Allegro MicroSystems], A1448 Datasheet

A1448

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]

Datasheet

1.A1448.pdf (7 pages)

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Features and Benefits

▪ Low-voltage operation, 1.8 to 4.2 V

▪ Multifunction CONTROL pin input:

▪ Reverse voltage protection on VDD and CONTROL pins

▪ Output thermal shutdown protection for robust performance

▪ Soft switching algorithm to reduce audible switching noise

▪ Hall chopper stabilization technique for precise signal

▪ Antistall feature guarantees continuous rotation and

▪ Single-chip solution for high reliability

▪ Miniature MLP/DFN package with industry-leading

Package:

1448-DS, Rev. 3

▫ Direct input PWM for speed control

▫ Active braking for fast stop cycle

▫ Sleep function to reduce average power consumption

and EMI

response over operating range

prevents overheating

0.40 mm maximum overall thickness

CONTROL

0.40 mm maximum overall height

VDD

6-contact MLP/DFN

Reverse Battery

1.5 mm × 2 mm

(EW package)

Integrated Hall Sensor IC, PWM Speed Control, Soft-Switching,

ESD

Approximate size

Amp

Low-Voltage, Full-Bridge Brushless DC Motor Driver with

Functional Block Diagram

Thermal Shutdown

Active Braking

Stall Detection

PWM Control

Sleep Mode

Protection

and Reverse Battery and Short Circuit Protection

To All Subcircuits

Description

The A1448 is a full-bridge motor driver designed to drive

low-voltage, brushless DC motors. The device is designed

to allow the user to control several functions with a single

input control pin. The pin allows for direct input PWM for

speed control, is used to initiate the active braking func-

tion to reduce motor stop time, and acts as an enable pin to

engage micro-power sleep mode to reduce average power

consumption when not in use. The A1448 is designed for

use in vibration motor applications in portable devices that

require fast stop-start cycles, such as haptic applications and

vibration ring tones.

Commutation of the motor is achieved by use of a single

Hall element to detect the rotational position of an alternat-

ing-pole ring magnet. A high density CMOS semiconductor

process allows the integration of all the necessary electron-

ics. This includes the Hall element, the motor control cir-

cuitry, and the output full bridge. Low-voltage design tech-

niques have been employed to achieve full device function-

ality down to 1.8 V V

solution provides enhanced reliability (including reverse

battery protection and output short circuit protection) and

eliminates the need for any external support components.

The A1448 employs a soft-switching algorithm to reduce

audible switching noise and EMI interference. The micro-

power sleep mode can be initiated on the CONTROL pin,

and reduces current consumption for battery management in

Continued on the next page…

Drive

Logic

Full Bridge

GND

. This fully integrated single chip

ESD

VOUT1

VOUT2

A1448

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A1448 Summary of contents

Page 1

... Low-Voltage, Full-Bridge Brushless DC Motor Driver with and Reverse Battery and Short Circuit Protection Description The A1448 is a full-bridge motor driver designed to drive low-voltage, brushless DC motors. The device is designed to allow the user to control several functions with a single input control pin. The pin allows for direct input PWM for ...

Page 2

... This feature allows the removal of a FET transistor for switching the device on and off. The A1448 is optimized for vibration motor applications in cel- lular phones, pagers, electronic toothbrushes, hand-held video game controllers, and can also be used as a micro-fan driver for fans motors ...

Page 3

... A1448 OPERATING CHARACTERISTICS Characteristics Electrical Characteristics Supply Voltage Extended Range of Supply Voltage 1 Supply Current 2 Total Output On-Resistance Reverse Battery Current CONTROL Pin Input Threshold CONTROL Pin Input Current CONTROL Pin Input Frequency 3 CONTROL Prebraking Time Thermal Shutdown Limit Thermal Shutdown Hysteresis ...

Page 4

... Signals higher than the V Figure 1. A1448 output soft switching with a 30 Ω resistive load Low-Voltage, Full-Bridge Brushless DC Motor Driver with Integrated Hall Sensor IC, PWM Speed Control, Soft-Switching, ...

Page 5

... PCB and therefore not necessary on the motor PCB. V BATT VDD C A1448 BYP System Logic Control I/O CONTROL NC V BATT VDD VOUT2 A1448 VOUT1 CONTROL C BYP NC GND VOUT2 M VOUT1 GND M Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com 5 ...

Page 6

... D θ Δ Figure 5. A1448 typical application Low-Voltage, Full-Bridge Brushless DC Motor Driver with Integrated Hall Sensor IC, PWM Speed Control, Soft-Switching, and Reverse Battery and Short Circuit Protection Power Derating For a load of 30 Ω, and given common conditions such as 25°C, V ...

Page 7

... A1448 0.08 C 0.50 BSC +0.055 0.325 –0.045 For Reference Only, not for tooling use (refernce DWG-2856; similar to JEDEC Type 1, MO-229X2BCD) Dimensions in millimeters Exact case and lead configuration at supplier discretion within limits shown A Terminal #1 mark area B Exposed thermal pad (reference only, terminal #1 ...

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