Rainbow Electronics BA4908 User Manual
System Regulator for Car Stereo
BA4908
03W201A
Description
BA4908 is a system regulator IC for car stereo.
This IC incorporates 1 channel of 5.6V output,
2 channels of 8.7V output and 2 channels of
high side switch.
Features
1) PNP output and low drop out type (Except AMP and ANT)
2) Built-in output current limit circuit to protect IC from
destruction by short
3) Built-in over-voltage protection circuit to deliver strong
design for surge input to BACK UP and Vcc
4) 12 pin power package perfect for space saving design
5) Built-in thermal protection circuit to protect IC from
thermal destruction
Applications
Car stereo
Dimension (Unit : mm)
29.8 ± 0.2
24.0 ± 0.1
6.9 ± 0.1
1.2
7.0 ± 0.1
21.6 ± 0.5
1
6.5 ± 0.5
2.54
SIP-M12
4.7 ± 0.2
R1.8
13.9 ± 0.3
12
0.6
1.2
0.4 ± 0.1
Absolute Maximum Ratings (Ta=25˚C)
Parameter Symbol
Power supply voltage
Power dissipation
Operating temperature range
Storage temperature range
∗Derating : 27.2mW/˚C for operation above Ta=25˚C
Topr
Tstg
Vcc
Pd
Limits
3000
-
30
-
55
Recommended Operating Conditions (Ta=25˚C)
Parameter Min. Max. UnitTyp.Symbol
Recommended supply voltage
Operating voltage range
∗Electric characteristic is not guaranteed. (Especially at low input voltage)
Vcc 1610 13.2 V
Vcc 246.3 13.2 V
24
~
~
+
+
∗
85
150
Unit
V
mW
˚C
˚C
February, 2004
Electrical characteristics (Unless otherwise noted: Ta=25˚C, Vcc=13.2V)
Parameter
Circuit current at standby
Symbol Min. Max. Unit ConditionsTyp.
IST
-
0.55
0.80
mA
STAN BY pin = 0V
Output voltage(VDD)1
Minimum I/O voltage difference
Output current capacity
Output voltage(COM)2
Minimum I/O voltage difference
Output current capacity
I/O voltage difference(AMP)3
Output current capacity
I/O voltage difference(ANT)4
Output current capacity
Output voltage(TUNER5.6)5
Minimum I/O voltage difference
Output current capacity
Output voltage(TUNER8.7)6
Minimum I/O voltage difference
Output current capacity
∗ This product is not designed for protection against radioactive rays.
∗ Output current capacity must be set below MINIMUM of the specification.
VO1 IO1=80mA
∆VO13
IO1
∆VO23
IO2
∆VO31
∆VO41
VO5
∆VO53
IO5
VO6
∆VO63
IO6
5.30
-
100
8.25 8.70 9.15VO2
-
150
-
500 900
-
500 900
5.3 5.6 5.9
-
150
8.25 8.70 9.15
-
250
5.60
5.90
0.3
200
0.4
300
1.0 1.5
1.0 1.5
0.4
300
0.4
500
0.7
-
0.7
-
-
-
0.7
-
0.7
-
V
V
mA
V
V
mA
V
mAIO3
V
mAIO4
V
V
mA
V
V
mA
IO1=80mA
VO1≥5.3V
IO2=120mA
IO2=120mA
VO2≥8.25V
IO3=400mA
VO3≥11.7V
IO4=400mA
VO4≥11.7V
IO5=50mA
IO5=120mA
VO5≥5.3V
IO6=140mA
IO6=200mA
VO6≥8.25V
Block Diagram
N.C.
TUNER
8.7
ANT SW
TUNER
5.6
SW
STB
V
DD
AMP Vcc ANT
5.6V
Regulator
Over voltage
protection
COM
8.7V
TUNER
5.6
TUNER
8.7
BA4908
121 2 3 4 5 6 7 8 9 10 11
GND
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