A8904SLPT Allegro Micro Systems, Inc., A8904SLPT Datasheet

A8904SLPT

Manufacturer Part Number

A8904SLPT

Description

SSOP28

Manufacturer

Allegro Micro Systems, Inc.

Datasheet

1.A8904SLBT.pdf (18 pages)

Specifications of A8904SLPT

Date_code

05+

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Part Number:

A8904SLPT

Manufacturer:

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A8904SLPTR-T

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Load Supply Voltage, V

Output Current

Peak Output Current (Brake)

Period

Logic Supply Voltage, V

Logic Input Voltage Range, V

Package Power Dissipation, P

Operating Temperature, T

Junction Temperature

Storage Temperature,T

determined by system concerns and factors. These

include: system duty cycle and timing, ambient

temperature, and use of any heatsinking and/or forced

cooling. For reliable operation, the specified maximum

junction temperature should not be exceeded.

occurs during braking when the motor acts as a

generator. The 3 A level is based on the maximum

peak of a sine wave that is damped. The maximum

period between the initial brake being applied and the

current through the drivers falling to 1.4 A should not

exceed 800 ms. See Braking section for more

information.

temperature will activate device thermal shutdown

circuitry. These conditions can be tolerated, but should

be avoided.

Output current rating may be restricted to a value

Peak output current is a transient condition that

Fault conditions that produce excessive junction

±3.0 A to ±1.4 A . . . . . . . . . . . . . . . 800 ms

(continuous) . . . . . .

Absolute Maximum Ratings

<30 ns) . . . . . . .

for I

OUT(BRK)

A8904SLB

, I

OUT . . . . . . . . . . . . . . . . . . . . .

CONTROLLER/DRIVER WITH BACK-EMF SENSING

to fall from

, T

. . . . -55°C to +150°C

. . . . . . . . . . . .

-0.3 V to V

-1.0 V to V

. . . . . . . . . . . 7.0 V

. . . -20°C to +85°C

. . . . . . . . . +150°C

(SOIC)

, I

OUT(BRK)

. . See Graph

. ±3.0 A

+ 0.3 V

+ 1.0 V

±1.4 A

15 V

are in production but have been determined to be LAST TIME BUY. This classification

indicates that sale of this device is currently restricted to existing customer applications.

The variants should not be purchased for new design applications because obsolescence

in the near future is probable. Samples are no longer available. Status change: October

31, 2006. Deadline for receipt fo LAST TIME BUY orders: April 27, 2007. These variants

include: A8904SLB, A8904SLBTR, A8904SLP, and A8904SLPTR.

8904

controller/drivers designed for applications where accurate control of high-

speed motors is required. The three half-bridge outputs are low on-resistance

n-channel DMOS devices capable of driving up to 1.2 A. The A8904 provides

complete, reliable, self-contained back-EMF sensing, motor startup and

running algorithms. A programmable digital frequency-locked loop speed

control circuit together with the linear current control circuitry provides

precise motor speed regulation.

operation, such as the speed control parameters, startup current limit, sleep

mode, direction, and diagnostic modes.

process, an advanced mixed-signal technology that combines bipolar, analog

and digital CMOS, and DMOS power devices. The A8904SLB is provided in

a 24-lead wide-body SOIC batwing package. The A8904SLP is provided in a

thin (<1.2 mm), 28-lead TSSOP package with an exposed thermal pad. Each

package type is available in a lead-free version (100% matte tin leadframe).

Features

A8904SLB-T

A8904SLBTR-T

A8904SLP-T

A8904SLPTR-T

Pb-based variants are being phased out of the product line. The variants cited in this footnote

Part Number

3-PHASE BRUSHLESS DC MOTOR

Pin-for-pin replacement for A8902CLBA

Startup commutation circuitry

Sensorless commutation circuitry

Option of external sector data tachometer signal

Option of external speed control

Oscillator operation up to 20 MHz

Programmable overcurrent limit

Transconductance gain options: 500 mA/V or 250 mA/V

Programmable watchdog timer

Directional control

Serial Port Interface

TTL-compatible inputs

System diagnostics data out ported in real time

Dynamic braking through serial port or external terminal

The A8904SLB and A8904SLP are three-phase brushless dc motor

A serial port allows the user to program various features and modes of

The A8904 is fabricated in Allegro’s BCD (Bipolar CMOS DMOS)

Pb-free*

Yes

28-pin TSSOP

24-pin SOIC

Package

4000 per reel

450 per reel

31 per tube

50 per tube

Packing

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