A1448EEWLT-P Allegro Microsystems Inc, A1448EEWLT-P Datasheet

A1448EEWLT-P

Manufacturer Part Number

A1448EEWLT-P

Description

BLDC FULL BRIDGE MOTOR DRIVER W/HALL

Manufacturer

Allegro Microsystems Inc

Datasheet

1.A1448EEWLT-P.pdf (7 pages)

Specifications of A1448EEWLT-P

Applications

DC Motor Driver, Brushless (BLDC)

Number Of Outputs

Current - Output

±200mA

Voltage - Supply

1.8 V ~ 4.2 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

6-XFDFN Exposed Pad

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Voltage - Load

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Other names

620-1274-2

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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

Related parts for A1448EEWLT-P

A1448EEWLT-P Summary of contents

Page 1

Integrated Hall Sensor IC, PWM Speed Control, Soft-Switching, Features and Benefits ▪ 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 ...

Page 2

... W. The Allegro DFN (EW) package is the thinnest DFN in the Selection Guide Part Number A1448EEWLT-P 3000 pieces per 7-in. reel *Contact Allegro for additional packing options Absolute Maximum Ratings Characteristic Forward Supply Voltage ...

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 ...

Page 4

A1448 Soft Switching The A1448 device includes a soft-switching algorithm that controls the output switching slew rate for both output pins result, the A1448 device is ideal for use in applications requiring low audible switching noise and low ...

Page 5

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 ...

Page 6

A1448 The device must be operated below the maximum junction tem- perature of the device, T (max). Under certain combinations of J peak conditions, reliable operation may require derating supplied power or improving the heat dissipation properties of the appli- ...

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 ...

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