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.



Application

· 12 V high-performance hard disk drives.


Pinout




Specifications

SYMBOL	PARAMETER	CONDITIONS	MIN.	MAX.	UNIT
VDD	general supply voltage	indefinite time period	-0.3	+13.5	V
			-0.3	+15	V
VDDD	digital supply voltage	indefinite time period	-0.3	+6.0	V
			-0.3	+7.0	V
VDDA	analog supply voltage	indefinite time period	-0.3	+7.0	V
			-0.3	+7.0	V
VDDV	supply for VCM DMOS driver	indefinite time period	-0.3	+13.5	V
			-0.3	+15	V
VCM+	output voltage of the VCM power stage		-0.7	+15	V
VCM-	output voltage of the VCM power stage		-0.7	+15	V
ICM+	output current of the VCM power stage	current peak <0.5 s	-0.7	2.5	A
ICM-	output current of the VCM power stage	current peak <0.5 s	-	2.5	A
VMOT	BEMF comparator input voltage (pins 4, 7 and 10)		-0.7	-	V
Vn	input voltages on other pins		-0.3	-	V
Tstg	IC storage temperature		-55	+125
Tj(max)	maximum junction temperature		-	150

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 TDA5149G 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, TDA5149G 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. TDA5149G 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 TDA5149G is contained in a LQFP64 package with 4 pins connected to the lead frame for improved heat dissipation.