A8904SLB

Series: -
Applications: DC Motor Driver, Brushless (BLDC), 3 Phase
Number of Outputs: 1
Mounting Type: Surface Mount
Evaluation Tools: -
Packaging: Tube
Voltage - Supply: 4.5 V ~ 5.5 V
Operating Temperature: -20°C ~ 85°C
Manufacturer: Allegro Microsystems Inc
Current - Output: ±1.4A
Package / Case: 24-SOIC (0.295", 7.50mm Width)
Supplier Device Package: 24-SOIC W
Voltage - Load: 4 V ~ 14 V


Features:

·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


Pinout




Specifications

Load Supply Voltage, V_BB . . . . . . . . . . . . . . . 15 V
Output Current¹, I_OUT . . . . . . . . . . . . . . . .±1.4 A
Peak Output Current (Brake)², I_OUT(BRK) . ±3.0 A
Period2 for IOUT(BRK) to fall from
    ±3.0 A to ±1.4 A . . . . . . . . . . . . . . . . . .800 ms
Logic Supply Voltage, VDD . . . . . . . . . . . . . . 7.0 V
Logic Input Voltage Range, VIN
    (continuous) . . . . . . . . . . .-0.3 V to V_DD + 0.3 V
    (t_w <30 ns) . . . . . . . . . . . .-1.0 V to V_DD + 1.0 V
Package Power Dissipation, P_D . . . . . . See Graph
Operating Temperature, T_A . . . . -20°C to +85°C
Junction Temperature³, T_J . . . . . . . . . . . .+150°C
Storage Temperature,T_S . . . . . .-55°C to +150°C

1 Output current rating may be restricted to a value 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.

2  Peak output current is a transient condition that 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.

3  Fault conditions that produce excessive junction temperature will activate device thermal shutdown circuitry. These conditions can be tolerated, but should be avoided.

Description

The A8904SLB and A8904SLP are three-phase brushless dc motor controller/drivers designed for applications where accurate control of highspeed 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.

A serial port allows the user to program various features and modes of operation, such as the speed control parameters, startup current limit, sleep mode, direction, and diagnostic modes.

The A8904 is fabricated in Allegro's BCD (Bipolar CMOS DMOS) 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 SSOP package with an exposed thermal pad. Each package type is available in a lead-free version (100% matte tin leadframe).

Parameters:

Technical/Catalog Information	A8904SLB
Vendor	Allegro Microsystems Inc
Category	Integrated Circuits (ICs)
Applications	DC Motor Driver, Brushless (BLDC), 3 Phase
Number of Outputs	1
Voltage - Supply	4.5 V ~ 5.5 V
Voltage - Load	4 V ~ 14 V
Current - Output	±1.4A
Operating Temperature	-20°C ~ 85°C
Package / Case	24-SOIC (7.5mm Width)
Packaging	Tube
Lead Free Status	Contains Lead
RoHS Status	RoHS Non-Compliant
Other Names	A8904SLB A8904SLB