bd4912 ROHM Co. Ltd., bd4912 Datasheet - Page 8

• Manufacturer Part Number: bd4912
• Description: Dmos System Power Supply Ics With Low Current Consumption Now Available
• Manufacturer: ROHM Co. Ltd.

Block diagram
Pin descriptions
10
11
12
1
2
3
4
5
6
7
8
9
12
10
11
1
2
3
4
5
6
7
8
9
Fig.38 Pin Assignment Diagram
GND
ILM
P.ANT
P.CON
AM
V
AUDIO
SW5V
V
SEL1
SEL2
V
CC
CC
DD
1
2
AUDIO
P.CON
P.ANT
SW5V
SEL1
SEL2
V
V
GND
V
ILM
AM
CC
CC
DD
1
2
This pin is connected to the IC's substrate.
This pin serves as the lighting power supply (10.3 V; Peak output current: 200 mA).
This pin outputs a voltage that is approximately 0.4 V (TYP) lower than the V
voltage, and the peak output current is 300 mA.
This pin outputs a voltage that is approximately 0.4 V (TYP) lower than the V
voltage, and the peak output current is 350 mA.
This pin serves as the AM receiver power supply (7.9 V; Peak output current: 25 mA).
This pin is connected to the car's backup and ACC power supplies.
This pin serves as the common system power supply for volume and sound control
(8.12 V, Peak output current: 200 mA), as well as the power supply for variable
capacitance diodes and other components used for electronic tuning and cassette
player features, such as the equalizer.
This pin serves as the microcontroller power supply (5.0 V; Peak output current: 30 mA).
This pin serves as the microcontroller power supply (5.0 V; Peak output current: 400 mA).
This pin serves as the V
ILM, P.CON, and P.ANT output can be switched on or off by applying a 2.25 V, 4.25 V, or
9.5 V signal to this pin.
AUDIO, SW5V, and AM output can be switched on or off by applying a 2.5 V or 4.25 V
signal to this pin.
0.47μF
GND
SEL2
SEL1
Vcc1
12
11
6
1
Except （VDD, SW5V）
Shutdown
Over protection
Thermal
DD
OFF
circuit
3 state
4 state
power supply pin.
8/16
Fig.39 Block Diagram
Pre Reg
Vref
Vｂｕf
－
－
－
－
Vcc1
ALL OUTPUTS
Vcc1
Vcc1
protection
Vcc1
V
Vcc1
DD
circuit
Over
OFF
CC
CC
10
9
2
4
3
5
8
7
1 pin
1 pin
P.CON
AUDIO
P.ANT
SW5V
Vcc2
V
ILM
AM
DD
0.47μF
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF