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TDA5149

12 V Voice Coil Motor (VCM) driver and spindle motor pre-driver combination chip

Philips Electronics 

Philips Semiconductors

12 V Voice Coil Motor (VCM) driver and

spindle motor pre-driver combination chip

Product specification

TDA5149G

FEATURES

General features

• Single-chip voice coil motor driver and spindle motor

pre-driver

• Internal voltage reference generator

• Programming of timing parameters via the serial bus

• Control of sleep, brake and disable modes for both the

VCM and spindle via the serial bus

• Temperature monitor circuit

• General purpose uncommitted operational amplifier.

Voice coil motor driver

• On-board full-bridge power DMOS driver with low RDSon

• Class AB linear amplifier with no dead zone

• Adjustable gain and bandwidth

• Retract circuit operating at power-down.

Spindle motor pre-driver

• Designed to drive external N-channel power MOSFETs

for brushless, sensorless DC motors

• Internal or external commutation control

• Digital commutation timing

• Average motor supply current control with Pulse Width

Modulation (PWM)

• Soft switching under PWM control

• Spindle brake after park at power-down.

APPLICATIONS

• 12 V high-performance hard disk drives.

GENERAL DESCRIPTION

The TDA5149G is a combination of a voice coil motor

driver and a spindle motor pre-driver, capable of operating

12 V high-performance hard disk drives.

The device integrates a spindle pre-driver that drives three

external N-channel power MOSFETs in order to drive a

three-phase brushless, sensorless DC motor in full wave

mode. In the normal mode, commutations are generated

from the internal Back EMF (BEMF) sensing circuitry.

Commutations, however, can also be generated from an

external source, thereby providing the possibility of driving

the motor in the stepper-motor mode.

The VCM driver is a linear transconductance amplifier

capable of handling currents up to 1.65 A. It allows

external adjustment of the gain and compensation.

The TDA5149G also contains two drivers for a latch that

secures the heads in the event of power-down.

To control functions such as park, brake, sleep or disable

and to program the different timing parameters, the

TDA5149G is provided with a three-wire serial port. A high

precision voltage monitor is also included, for both

5 and 12 V power supplies. Finally, the IC contains a

temperature monitor circuit and an uncommitted

operational amplifier connected to VDD, which can be used

freely within the application. The device is contained in a

LQFP64 package with 4 pins connected to the lead frame

for improved heat dissipation.

QUICK REFERENCE DATA

SYMBOL

VDD

VDDD

VDDA1

IoVCM

RDSon

PARAMETER

general supply voltage (pin 54)

digital supply voltage (pin 55)

analog supply voltage (pin 27)

voice coil motor output current

VCM power DMOS total on-resistance

(including leads and bond wires)

CONDITIONS

Tj = 25 °C

Tj = 125 °C

MIN.

10.8

4.5

4.5

−

−

−

TYP.

12.0

5.0

5.0

−

−

−

MAX.

13.2

5.5

5.5

1.65

0.65

1.1

UNIT

V

V

V

A

Ω

Ω

ORDERING INFORMATION

TYPE

NUMBER

TDA5149G

PACKAGE

NAME

DESCRIPTION

LQFP64 plastic low profile quad flat package; 64 leads; body 10 × 10 × 1.4 mm

VERSION

SOT314-2

1996 May 06

2

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