TDA7473
QUAD BTL DRIVER WITH VOLTAGE REGULATOR
4 BUILT-IN POWER BRIDGES (4 x 0.6A)
NO EXTERNAL COMPONENTS
SINGLE POWER SUPPLY
WIDE SUPPLY VOLTAGE RANGE (6 TO 15V)
5V REGULATOR DRIVER FOR EXTERNAL
PASS
TRANSISTOR
WITH
FOLD-BACK
SHORT CIRCUIT PROTECTION
ADJUSTABLE REGULATOR (2.0 TO 3.6V @
200mA) WITH SHORT CIRCUIT PROTEC-
TION
DESCRIPTION
This device is a quad power driver circuit in BTL
configuration, intended for use as a power driver
for servo systems with a single supply.
It's specially dedicated to compact disc players
and it's capable of driving focus & tracking actua-
tors sledge & spindle motors.
The regulators are mainly used to have a 5V sup-
ply for the power part and a lower programmable
voltage for the logic circuits.
June 1998
OC
+
-
VS/2
-
+
OUT 1+
OUT 1-
OUT 4-
REFERENCE
ADJ
REG
ST_BY
IN4
COMM
REF
VS3
IN2
IN1
DRIV
D95AU223B
IN3
5V
+
-
+
-
VS/2
-
+
OUT 2+
OUT 2-
+
-
+
-
VS/2
-
+
OUT 3+
OUT 3-
+
-
+
-
VS/2
-
+
OUT 4+
+
-
M
M
TRACKING
ACTUATOR
SLEDGE
MOTOR
SPINDLE
MOTOR
FOCUS
ACTUATOR
VBG
VBG
VBG
VS4
GND GND GND GND
VSUP
+
VS1
VS2
R1
1K
R2
1K
Figure 1: Quad BTL Power Bridges + Multifunction Regulators.
SO28 (24+2+2)
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PIN FUNCTIONS
N. Pin
Name
Description
1
5V
5V regulated input
2
VSUP
Positive power supply (battery)
3
OUT1-
1.st channel negative output
4
VS1
1.st channel power supply
5
OUT1+
1.st channel positive output
6
OC
Overcurrent sense input
7
GND
Ground
8
GND
Ground
9
ADJ
Regulated voltage adjust input
10
OUT2+
2.nd channel positive output
11
VS2
2.nd channel power supply
12
OUT2_
2.nd channel negative output
13
ST_BY
Stand_by
14
REG
Regulated voltage output
15
COMM
Common negative input
16
IN2
Positive input for the 2.nd channel
17
OUT3-
3.rd channel negative output
18
VS3
3.rd channel power supply
19
OUT3+
3.rd channel positive output
20
IN3
Positive input for the 3.rd channel
21
GND
Ground
22
GND
Ground
23
IN4
Positive input for the 4.th channel
24
OUT4+
4.th channel positive output
25
VS4
4.th channel power supply
26
OUT4-
4.th channel negative output
27
IN1
Positive input for the 1.st channel
28
DRIV
Pass transistor driver
5V
VSUP
OUT1-
VS1
OUT1+
GND
IN1
GND
IN2
IN3
GND
GND
OUT4+
IN4
OC
VS4
OUT4-
DRIV
1
3
2
4
5
6
7
8
9
26
25
24
23
22
20
21
19
27
10
28
OUT2+
OUT3+
D95AU310A
COMM
VS2
OUT2-
OUT3-
VS3
ST_BY
11
12
13
18
16
17
15
14
ADJ
REG
PIN CONNECTION (Top view)
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ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
SUP
DC Supply Voltage
18
V
V
S
Channel Power Supply
6
V
T
OP
Operating Temperature Range
-25 to 80
C
T
J
Maximum Junction Temperature
150
C
THERMAL DATA
Symbol
Parameter
Value
Unit
R
th j-amb
Thermal Resistance Junction to Ambient
Max.
50 (*)
C/W
R
th j-pins
Thermal Resistance Junction to Pins
Typ.
17
C/W
(*) with 6cm
2
of copper heatsink on board.
ELECTRICAL CHARACTERISTICS (@ V
SUP
= 6V, T
amb
= 25
C, unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
V
SUP
Supply Voltage
6
15
V
Maximum Power Dissipation (1)
1.5
W
Quiescent current (2) from V
S
V
(pin 4, 11, 18, 25)
= 5V
20
35
mA
Quiescent current (2) from 5V
V
(pin 1)
= 5V, R2 =
1.8
2.5
mA
Quiescent current (2) from V
SUP
V
SUP
= 15V
1.3
2.5
mA
V
SUP
= 6V
1
2
mA
Stand-by current from 5V (pin 1)
V
(pin 1)
= 5V, R2 =
1.2
2
mA
Stand-by current from V
SUP
V
SUP
= 15V
0.4
0.8
mA
V
SUP
= 6V
0.3
0.6
mA
CHANNELS BTL
Peak output current for channels
0.6
A
V
SAT
VSAT HIGH SIDE
I = 0.6A; V
S
= 5V
1.3
1.6
A
VSAT LOW SIDE
I = 0.6A; V
S
= 5V
0.7
0.9
A
Output voltage swing peak-to-
peak
V
S
= 5V, I
out
= 0.6A
5.5
6
Vpp
Voltage gain for channels
25.5
26.5
27.5
dB
Channels output offset voltage
-180
-50
100
mV
VST-BY
Channel St-By Threshold
Active --> St-By
0.65 V
reg
0.75 V
reg
0.85 V
reg
V
St-By --> Active
0.50 V
reg
V
REGULATORS
V
5V
Vpin 1
I
out
= 0.2A
4.85
5.05
5.25
V
Min drop 5V --> REG
I
out
= 0.2A
1.2
1.3
V
I
DRIV
Output current from DRIV for
pass-transistor driving
50
100
mA
Output current from DRIV in
stand-by
20
50
80
mA
DROP V
SUP
--> DRIV
I
DRIV
= 20mA
0.2
0.25
V
Threshold voltage for overcurr.
protection (VSUP - OC)
V
SUP
= 6V
190
230
270
mV
V
SUP
= 12V
120
160
200
mV
V
SUP
= 15V
80
100
120
mV
V
REG
Regulator Voltage
R1, R2 = 1K
2.45
2.53
2.65
V
Min REG voltage (settable)
1.8
2
V
Max REG voltage (settable)
3.6
3.8
V
Output current from REG in
Stand-by
R1, R2 = 1K
20
mA
(1) @ T
amb
= 70
C, on board 6cm
2
copper heatsink
(2) INx = COMM; no loads on the regulators outputs
(3) Device is active when St-By = Low
TDA7473
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SO28 PACKAGE MECHANICAL DATA
DIM.
mm
inch
MIN.
TYP.
MAX.
MIN.
TYP.
MAX.
A
2.65
0.104
a1
0.1
0.3
0.004
0.012
b
0.35
0.49
0.014
0.019
b1
0.23
0.32
0.009
0.013
C
0.5
0.020
c1
45
(typ.)
D
17.7
18.1
0.697
0.713
E
10
10.65
0.394
0.419
e
1.27
0.050
e3
16.51
0.65
F
7.4
7.6
0.291
0.299
L
0.4
1.27
0.016
0.050
S
8
(max.)
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of use of such information nor for any infringement of patents or other rights of third parti es which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are
subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products
are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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1998 STMicroelectronics Printed in Italy All Rights Reserved
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