TECHNICAL NOTE
System Power Supply LSI Series for Use in Automotive Electronics
DMOS System Power Supply
ICs with low current consumption
Now available
ESD
Resistance
BD4912/BD4912-V4
Description
The BD4912/BD4912-V4 provides multiple supply voltage outputs for use in car audio and satellite navigation systems with
CD player, radio, antenna, lighting, and other components. In addition to overcurrent, overvoltage, and thermal shutdown
circuits, it incorporates circuitry for reacting to sudden BATTERY power failures and is ideal for car audio and satellite
navigation systems. With its 110
µA
(max.) standby current, the BD4912/BD4912-V4 delivers low current consumption when
the BATTERY is off.
Features
1) Built-in power supplies for car audio and satellite navigation systems
•
5.0 V microcontroller power supply
•
8.12 V audio power supply
•
7.9 V radio power supply
•
10.3 V lighting power supply
•
1 V
DD
-linked high side switch
•
2 V
CC
-linked high side switches
2) Compatible with 0.1
µF
output load ceramic capacitors. (Note: Select the adequate capacitance values for each
particular application)
3) The ability to operate V
DD
using the charge stored in a backup capacitor, prevents the IC from malfunctioning in the
event of a sudden BATTERY power failure.
4) Output pins use low-dropout P-channel POWER MOS FETs
5) Built-in overcurrent protection circuits
6) Built-in overvoltage protection circuits
7) Built-in thermal shutdown circuit
8) A 12-pin power package gives the IC large power dissipation capabilities and is ideal for space-saving designs.
Applications
Car audio and satellite navigation systems
Ver.B Oct.2005
Absolute maximum ratings
(Ta = 25°C)
Parameter
Symbol
Supply Voltage 1
V
CC
1
Supply Voltage 2
V
CC
2
SEL1 Supply Voltage
SEL1
SEL2 Supply Voltage
SEL2
Power Dissipation
Pd
Operating Temperature Range
Topr
Storage Temperature Range
Tstg
Maximum Junction Temperature
Tjmax
Peak Supply Voltage 1
V
CC
1 PEAK
Peak Supply Voltage 2
V
CC
2 PEAK
*1 tr
≥
1 ms; Bias voltage is applied for less than 200 ms.
Limits
36
36
12
12
3400
-40 to +85
-55 to +150
150
50
(*1)
50
(*1)
Unit
V
V
V
V
mW
°C
°C
°C
V
V
tr
≥
1 m
50 V
35 V
0V
MAX. 200 ms
(Voltage supply more than 35 V)
Fig.1 Peak Supply Voltage Waveform
Recommended operating ranges
(Ta = 25°C)
Parameter
Limits
Recommended Supply
10 to 18
Voltage Range1
Recommended Supply
11.5 to 18
Voltage Range 2
Recommended Supply
6.3 to 18
Voltage Range 3
Unit
V
V
V
Comment
Except V
DD
and ILM output
ILM output
V
DD
output
Electrical characteristics
(Unless otherwise specified, Ta = 25°C; V
CC
1 = V
CC
2 = 14.4 V)
Limits
Parameter
Symbol
Unit
Min.
Typ.
Max.
Standby Circuit Current
Ist
—
—
110
µA
Output Voltage (V
DD
) 1
Dropout Voltage
Peak Output Current
Ripple Rejection Ratio
Low Vcc Output Voltage
Output Voltage (AUDIO) 2
Dropout Voltage
Peak Output Current
Ripple Rejection Ratio
V
O
1
∆V
O
1
I
O
1
R.R1
V
O
1’
V
O
2
∆V
O
2
I
O
2
R.R2
4.80
—
400
50
4.8
7.8
—
200
45
5.00
0.8
—
55
—
8.12
0.4
—
55
5.20
1.1
—
—
—
8.3
0.7
—
—
V
V
mA
dB
V
V
V
mA
dB
Condition
I
O
= 300 mA, V
CC
2 = 10 V to 18 V
I
O
= 300 mA, V
CC
2-V
O
1
V
O
1
≥
4.8 V
f = 100 Hz, VRR = -10 dBV,
I
O
= 300 mA
V
CC
2 = 5 V, I
O
= 10 mA
I
O
2 = 200 mA, V
CC
1 = 10 V to 18 V
I
O
2 = 200 mA, V
CC
1-V
O
2
V
O
2
≥
7.8 V
f = 100 Hz, VRR = -10 dBV,
I
O
= 200 mA
This product is not designed for protection against radioactive rays.
Use Peak Output Current less than Limits Min. values.
2/16
Electrical characteristics
(Unless otherwise specified, Ta = 25°C; V
CC
1= V
CC
2 = 14.4 V)
Limits
Typ.
0.4
—
Parameter
(SEL1 > 3.5 V)
Dropout Voltage (P.CON) 3
Peak Output Current
(SEL1 > 7.0 V)
Dropout Voltage (P.ANT) 4
Peak Output Current
(SEL2 > 3.5 V)
Output voltage (AM) 5
Dropout Voltage
Peak Output Current
Ripple Rejection Ratio
Symbol
Min.
—
350
Max.
0.7
—
Unit
Condition
∆V
O
3
I
O
3
V
mA
I
O
3 = 350 mA, V
CC
1-V
O
3
V
O
3
≥
13.7 V
∆V
O
4
I
O
4
—
300
0.4
—
0.7
—
V
mA
I
O
4 = 300 mA, V
CC
1-V
O
4
V
O
4
≥
13.7 V
V
O
5
∆V
O
5
I
O
5
R.R5
7.5
—
25
45
7.9
0.4
—
55
8.3
0.7
—
—
V
V
mA
dB
I
O
5 = 25 mA, V
CC
1 = 10 V to 18 V
I
O
5 = 25 mA, V
CC
1-V
O
5
V
O
5
≥
7.5 V
f = 100 Hz, VRR = -10 dBV,
I
O
= 25 mA
(SEL2 > 2.0 V)
Dropout Voltage (SW5V)
Peak Output Current
(SEL1 > 1.5 V)
Output voltage (ILM) 7
Dropout Voltage
Peak Output Current
Ripple Rejection Ratio
∆V
O
6
I
O
6
—
30
0.15
—
0.3
—
V
mA
I
O
6
＝
30 mA, V
DD
-V
O
6
V
O
6
≥
V
DD
-0.2V
V
O
7
∆V
O
7
I
O
7
R.R7
9.9
—
200
40
10.3
0.5
—
50
10.7
0.8
—
—
V
V
mA
dB
I
O
7 = 200 mA, V
CC
1 = 12 V to 18 V
I
O
7 = 200 mA, V
CC
1-V
O
7
V
O
7
≥
9.9 V
f = 100 Hz, VRR = -10 dBV,
I
O
= 200 mA
Input (SEL1)
Standby Level
ILM ON
ILM, P-CON ON
ILM, P-CON, P-ANT ON
SEL1 Input Impedance
Input (SEL2)
Standby Level
AUDIO, SW5V ON
AUDIO, SW5V, AM ON
SEL2 Input Impedance
Vth1-1
Vth1-2
Vth1-3
Vth1-4
Rin1
—
1.5
3.5
7.0
100
—
—
—
—
—
1.0
3.0
5.0
12.0
—
V
V
V
V
kΩ
Vth2-1
Vth2-2
Vth2-3
Rin2
—
2.0
3.5
100
—
—
—
—
1.0
3.0
V
DD
—
V
V
V
kΩ
Overvoltage Protection
Vovp
27
30
33
Threshold
This product is not designed for protection against radioactive rays.
Use Peak Output Current less than Limits Min. values.
V
3/16
Reference data
(Unless otherwise specified, V
CC
1= V
CC
2 = 14.4 V)
1000
STBY CIRCUIT CURRENT:Ist [μA]
6
6
VDD OUTPUT VOLTAGE:Vo1 [V]
ＶＤＤ
OUTPUT VOLTAGE:Vo1 [V]
800
5
4
4
From the left,
Ta=85
℃
Ta=25
℃
Ta=-40
℃
600
400
From the left,
Ta=85
℃
Ta=25
℃
Ta=-40
℃
3
From the left,
Ta=85
℃
Ta=25
℃
Ta=-40
℃
2
2
200
1
0
0
10
20
30
40
SUPPLY VOLTAGE:Vcc1,2 [V]
0
0
10
20
30
40
SUPPLY VOLTAGE:Vcc1,2 [V]
0
50
100
150
200
AMBIENT TEMPERATURE:Ta [℃]
Fig.2 Standby Circuit Current
Fig.3 VDD Line Regulation
(I
O
= No load)
Fig.4 VDD Load Regulation
0.8
△
VDD DROPOUT VOLTAGE: Vo1 [V]
RIPPLE REJECTION:RR1 [dB]
80
5.2
VDD OUTPUT VOLTAGE:Vo1 [V]
10000
100000
Ta=85
℃
0.6
60
5.1
Ta=25
℃
0.4
40
5.0
0.2
Ta=-40
℃
20
From the left,
Ta=85
℃
Ta=25
℃
Ta=-40
℃
10
100
1000
4.9
0
0
100
200
300
400
OUTPUT CURRENT:Io [mA]
0
FREQUENCY:f [Hz]
4.8
-60
-20
20
60
100
AMBIENT TEMPERATURE:Ta [℃]
Fig.5 V
DD
Dropout Voltage
(V
CC
1 = V
CC
2 = 4.8 V)
Fig.6 V
DD
Ripple Rejection Ratio
(I
O
= 300 mA)
Fig.7 V
DD
Output Voltage vs Temperature
10
10
AUDIO DROPOUT VOLTAGE: Vo2 [V]
△
0.5
AUDIO OUTPUT VOLTAGE:Vo2 [V]
AUDIO OUTPUT VOLTAGE:Vo2 [V]
8
8
Ta=-40
℃
6
Ta=25
℃
4
Ta=85
℃
2
0.4
Ta=85
℃
6
0.3
4
From the left,
Ta=85
℃
Ta=25
℃
Ta=-40
℃
Ta=25
℃
0.2
2
0.1
Ta=-40
℃
0
0
10
20
30
40
SUPPLY VOLTAGE:Vcc1,2 [V]
0
0
100
200
300
400
500
OUTPUT CURRENT:Io [mA]
0
0
50
100
150
200
OUTPUT CURRENT:Io [mA]
Fig.8 AUDIO Line Regulation
(I
O
= No load)
Fig.9 AUDIO Load Regulation
Fig.10 AUDIO Dropout Voltage
(V
CC
1 = V
CC
2 = 7.8 V)
4/16
8.3
P.CON OUTPUT VOLTAGE:Vo3 [V]
15
AUDIO OUTPUT VOLTAGE:Vo2 [V]
RIPPLE REJECTION:RR2 [dB]
60
8.2
10
From the left,
Ta=-40
℃
Ta=85
℃
Ta=25
℃
8.1
30
5
From the left,
Ta=85
℃
Ta=25
℃
Ta=-40
℃
0
10
100
1000
10000
100000
FREQUENCY:f [Hz]
8.0
7.9
-60
-20
20
60
100
AMBIENT TEMPERATURE:Ta [℃]
0
0
200
400
600
OUTPUT CURRENT:Io [mA]
Fig.11 AUDIO Ripple Rejection Ratio
(I
O
= 200 mA)
Fig.12 AUDIO Output Voltage vs
Temperature
Fig.13 P.CON Load Regulation
0.6
15
P.CON DROPOUT VOLTAGE:△Vo3 [V]
0.5
P.ANT DROPOUT VOLTAGE:Vo4 [V]
Ta=85
℃
0.4
P.ANT OUTPUT VOLTAGE:Vo4[V]
10
From the left,
Ta=-40
℃
Ta=85
℃
Ta=25
℃
0.4
Ta=85
℃
Ta=25
℃
0.2
0.3
Ta=25
℃
0.2
5
Ta=-40
℃
0
0
50
100
150
200
250
300
350
0.1
Ta=-40
℃
0
0
200
400
600
800
OUTPUT CURRENT:Io [mA]
0
0
100
200
300
OUTPUT CURRENT:Io [mA]
OUTPUT CURRENT:Io [mA]
Fig.14 P.CON Dropout Voltage
Fig.15 P.ANT Load Regulation
Fig.16 P.ANT Dropout Voltage
10
10
0.5
△
AM DROPOUT VOLTAGE: Vo5 [V]
AM OUTPUT VOLTAGE:Vo5 [V]
AM OUTPUT VOLTAGE:Vo5 [V]
Ta=85
℃
0.4
8
8
6
4
From the left,
Ta=85
℃
Ta=25
℃
Ta=-40
℃
6
From the left,
Ta=-40
℃
Ta=85
℃
Ta=25
℃
0.3
Ta=25
℃
4
0.2
2
2
0.1
Ta=-40
℃
0
0
5
10
15
20
25
0
0
10
20
30
40
0
0
10
20
30
40
50
SUPPLY VOLTAGE:Vcc1,2 [V]
OUTPUT CURRENT:Io [mA]
OUTPUT CURRENT:Io [mA]
Fig.17 AM Line Regulation
(I
O
= No load)
Fig.18 AM Load Regulation
Fig.19 AM Dropout Voltage
(V
CC
1 = V
CC
2 = 7.5 V)
5/16
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