TDA5149G Datasheet, PDF (2/28 Pages) NXP Semiconductors – 12 V Voice Coil Motor VCM driver and spindle motor pre-driver combination chip

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 R_DSon
• 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 V_DD, 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
V_DD
V_DDD
V_DDA1
I_oVCM
R_DSon
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
T_j = 25 °C
T_j = 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