A1448: 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

This part has been discontinued. Samples are no longer available.

Date of status change: March 4, 2013.

Recommended Substitutions: For existing customer transition, and for new customers or new applications, contact Allegro Sales.

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 function 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 sensor to detect the rotational position of an alternating-pole ring magnet. A high density CMOS semiconductor process allows the integration of all the necessary electronics. This includes the Hall element sensor, the motor control circuitry, and the output full bridge. Low voltage design techniques have been employed to achieve full device functionality down to 1.8 V VDD. This fully integrated single chip 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 micropower sleep mode can be initiated on the CONTROL pin, and reduces current consumption for battery management in portable electronic devices. 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 cellular phones, pagers, electronic toothbrushes, hand-held video game controllers, and can also be used as a micro-fan driver for fans motors up to 1 W.

The Allegro DFN (EW) package is the thinnest DFN in the industry with a 0.40 mm maximum thickness that allows for very thin BLDC coin motor designs. The small package outline and low profile make this device ideally suited for use in applications where printed circuit board area and component headroom are at a premium. It is available in a lead (Pb) free, 6-contact MLP/DFN micro-leadframe package, with an exposed pad for enhanced thermal dissipation. Leadframe is 100% matte tin plated.

DATASHEETS
SAMPLE & BUY

Astrorep Inc. (Allegro and Sanken Semiconductors, Sanken Power Supplies)
141 John Street, Suite 300
Babylon, NY 11702
Phone: (631)422-2500
Fax: (631)422-2504
Web: www.astrorepinc.com
Email: donna.tweedy@astrorepinc.com

If this is not your local representative, find your local sales rep here.

RECEIVE PRODUCT ALERTS
We'll notify you when there are updates to this product. Sign Up
  • Features and BenefitsFeatures and Benefits
  • PackagingPackaging
  • Technical DocsTechnical Docs
  • NewsNews
  • Low-voltage operation, 1.8 to 4.2 V
  • Multifunction CONTROL pin input:
    • Direct input PWM for speed control
    • Active braking for fast stop cycle
    • Sleep function to reduce average power consumption
  • Reverse voltage protection on VDD and CONTROL pins
  • Output thermal shutdown protection for robust performance
  • Soft switching algorithm to reduce audible switching noise and EMI
  • Hall chopper stabilization technique for precise signal response over operating range
  • Antistall feature guarantees continuous rotation and prevents overheating
  • Single-chip solution for high reliability
  • Miniature MLP/DFN package with industry-leading 0.40 mm maximum overall thickness

The Allegro DFN (EW) package is the thinnest DFN in the industry with a 0.40 mm maximum thickness that allows for very thin BLDC coin motor designs. The small package outline and low profile make this device ideally suited for use in applications where printed circuit board area and component headroom are at a premium. It is available in a lead (Pb) free, 6-contact MLP/DFN micro-leadframe package, with an exposed pad for enhanced thermal dissipation. Leadframe is 100% matte tin plated.

EW DFN/MLP 6 contact

There are no news items available for this product.

Click the image to view larger
Product Image Functional Block Diagram

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check
Distributor Stock
A1448EEWLT-P 6-lead MLP/DFN -40°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

Copyright © 2017 Allegro MicroSystems, LLC

Sitemap  |  Privacy Policy  |  Contact Webmaster

Follow us on: LinkedIn YouTube Google+ Follow Allegro on Twitter

Careers   |   Contact Sales   |   Home   |   Legal   |   Quality & Environment   |   Request Samples