A1445EEWLT-P

A1445EEWLT-P Datasheet

A1444 and A1445

Part	Datasheet
A1445EEWLT-P	A1445EEWLT-P (pdf)

Related Parts	Information
A1444EEWLT-P	A1444EEWLT-P

PDF Datasheet Preview
A1444 and A1445 Low-Voltage Full-Bridge Brushless DC Motor Driver with Hall Commutation, Externally Controlled Speed Regulation, Soft Switching, Last Time Buy These parts are in production but have been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Date of status change November 2010 Deadline for receipt of LAST TIME BUY orders April 30, 2011 Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the A1442 and A1448. NOTE For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative. A1444 and A1445 Low-Voltage Full-Bridge Brushless DC Motor Driver with Hall Commutation, Externally Controlled Speed Regulation, Soft Switching, Low voltage operation to V Externally controlled motor speed regulation Fast motor startup and braking function allows faster noise and EMI interference Unidirectional operating mode results in motor rotation in only one direction Chopper stabilization reduces Hall signal offset drifts and results in increased signal accuracy over full operating temperature range Sleep mode pin allows device enable/disable for reducing average power consumption Antistall feature guarantees continuous rotation Single-chip solution for high reliability Miniature MLP/DFN package Package: 6-contact MLP/DFN mm x 2 mm. mm maximum overall height EW package Approximate size TheA1444 andA1445 are full-bridge motor drivers designed to drive low-voltage brushless DC BLDC motors in applications that require rotor speed control and fast rotor start-stop cycles. A high density CMOS semiconductor process allows the integration of a Hall element, a full-bridge output driver, and PWM speed control logic into one monolithic IC. Commutation of the motor is achieved by use of a single Hall element to detect the rotational position of an alternating-pole ring magnet. Low-voltage design techniques have been employed to achieve full device functionality down to a VDD of V. The voltage applied to the PDC pin is used to externally control the maximum speed of the motor by adjusting the PWM duty cycle of the output driver. The A1444 and A1445 employ a soft switching algorithm to reduce audible switching noise and EMI interference. The externally controlled speed regulation and braking functions can be used to create motor designs requiring faster start-stop cycles. TheA1444 andA1445 have different selectable internal PWM duty cycle options to accommodate a wide range of motor designs. Each device has a braking function enable pin that also includes a micropower sleep mode for battery management in portable electronic devices. This feature eliminates the requirement for a FET transistor to switch the device on and off. The devices are optimized for vibration motor applications that require fast start-stop cycles, such as in cellular phones, Continued on the next Functional Block Diagram SLEEP Power and Sleep Mode Control Active Braking Control Hall Element Stall Detection Amp Drive Logic and Soft Switching Control Thermal Shutdown Protection PWM Control Output Full Bridge Q2 Q4 VOUT1 VOUT2 A1444 and A1445 Low-Voltage Full-Bridge Brushless DC Motor Driver with Hall Commutation, Externally Controlled Speed Regulation, Soft Switching, Description continued area and component headroom are at a premium. It is available in a lead Pb free leadframe plating nickel palladium 6-contact MLP/DFN microleadframe package for surface mount assembly. The underside of the package also features an exposed pad for enhanced thermal dissipation. Selection Guide Packing1

PDF Datasheet Preview

A1444 and A1445

Low-Voltage Full-Bridge Brushless DC Motor Driver with Hall Commutation, Externally Controlled Speed Regulation, Soft Switching,

Last Time Buy

These parts are in production but have been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available.

Date of status change November 2010 Deadline for receipt of LAST TIME BUY orders April 30, 2011

Recommended Substitutions:

For existing customer transition, and for new customers or new applications, refer to the A1442 and A1448.

NOTE For detailed information on purchasing options, contact your local Allegro field applications engineer or sales representative.

A1444 and A1445

Low-Voltage Full-Bridge Brushless DC Motor Driver with Hall Commutation, Externally Controlled Speed Regulation, Soft Switching,

Low voltage operation to V Externally controlled motor speed regulation Fast motor startup and braking function allows faster
noise and EMI interference Unidirectional operating mode results in motor rotation in
only one direction Chopper stabilization reduces Hall signal offset drifts and
results in increased signal accuracy over full operating temperature range Sleep mode pin allows device enable/disable for reducing average power consumption Antistall feature guarantees continuous rotation Single-chip solution for high reliability Miniature MLP/DFN package

Package:
6-contact MLP/DFN mm x 2 mm.
mm maximum overall height EW package

Approximate size

TheA1444 andA1445 are full-bridge motor drivers designed to drive low-voltage brushless DC BLDC motors in applications that require rotor speed control and fast rotor start-stop cycles. A high density CMOS semiconductor process allows the integration of a Hall element, a full-bridge output driver, and PWM speed control logic into one monolithic IC. Commutation of the motor is achieved by use of a single Hall element to detect the rotational position of an alternating-pole ring magnet. Low-voltage design techniques have been employed to achieve full device functionality down to a VDD of V. The voltage applied to the PDC pin is used to externally control the maximum speed of the motor by adjusting the PWM duty cycle of the output driver.

The A1444 and A1445 employ a soft switching algorithm to reduce audible switching noise and EMI interference. The externally controlled speed regulation and braking functions can be used to create motor designs requiring faster start-stop cycles. TheA1444 andA1445 have different selectable internal PWM duty cycle options to accommodate a wide range of motor designs. Each device has a braking function enable pin that also includes a micropower sleep mode for battery management in portable electronic devices. This feature eliminates the requirement for a FET transistor to switch the device on and off.

The devices are optimized for vibration motor applications that require fast start-stop cycles, such as in cellular phones,

Continued on the next

Functional Block Diagram

SLEEP

Power and Sleep Mode Control

Active Braking Control

Hall Element

Stall Detection Amp

Drive Logic and

Soft Switching Control

Thermal Shutdown Protection

PWM Control

Output Full Bridge

Q2 Q4

VOUT1 VOUT2

A1444 and A1445

Low-Voltage Full-Bridge Brushless DC Motor Driver with Hall Commutation, Externally Controlled Speed Regulation, Soft Switching,

Description continued
area and component headroom are at a premium. It is available in a lead Pb free leadframe plating nickel palladium 6-contact MLP/DFN microleadframe package for surface mount assembly. The underside of the package also features an exposed pad for enhanced thermal dissipation.

Selection Guide

Packing1

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Datasheet ID: A1445EEWLT-P 516010