Datasheet
Multi-Channel Power Supply LSI Series for Car Electronics
Multi-channel Power Supply IC
for Car Audio Systems
BD49101ARFS-M
General Description
The BD49101ARFS-M LSI is a multi-channel power
supply IC that can provide all necessary supply voltages
for automobile audio systems. The IC has two Switching
Power Supplies (DCDC), five Regulators (REG) and a
High Side switch. This single power supply system can
provide the required voltages to all systems including the
MCU, CD, tuner, USB, illumination, audio circuits and
others.
The IC system is based on switching regulator which
has high efficiency then you can suppress heat of IC
than before. And it has low power mode operation or
voltage control function so that you can get
①High
Efficiency
②Low
IQ and
③easiness
of power supply
design.
Key Specifications
Input Voltage Range:
5.5V to 25V(VIN0=BCAP)
DCDC1(controller):
DCDC2(with low power mode for MCU):
1A
REG1(output voltage variable):
500mA
REG2(output voltage variable):
100mA
REG3(output voltage variable):
300mA
REG4(output voltage variable for USB):
1.5A
REG5(output voltage variable):
50mA
High side SW:
500mA
Standby Current:
100µA(Typ)
REG4 Over Current Detect Accuracy:
±20%
Operating Temperature Range:
-40°C to +85°C
DCDC Switching Frequency:
200kHz to 500kHz
Package
HTSSOP-A44R
W(Typ) x D(Typ) x H(Max)
18.50mm x 9.50mm x 1.00mm
Features
AEC-Q100 Qualified
Integrated 7 channels of Power Supply for Car Audio
・2
DCDC (Integrated 1 Controller )
・5
REG
1 High Side Switch channel
Integrated Low Power Standby REG for MCU Power
Supply
REG4 Cable Impedance Compensation
2
I C Interface
Selectable Oscillator Frequency using External
Resistance
External Clock Synchronization
Power Supply Control Function (Power on/off
Sequencer).
Low Voltage, Over Voltage and REG4 Over Current
Detect Flag
Integrated Protection Circuitry:
・Over
Voltage Input Protection
・Over
Current Protection
・Thermal
Shutdown
(Note1:Grade3)
(Note1)
HTSSOP-A44R
Applications
Car Audio and Infotainment
○Product
structure:Silicon monolithic integrated circuit
○This
product is not designed for protection against radioactive rays
.
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BD49101ARFS-M
Pin Configuration
GATE1
SNSL
SNSH
VIN2
N.C.
GND3
VOUT2
ADJ2
VOUT1
ADJ1
VIN1
VOUT0
INV2
FB2
SW2
GND4
HSW
N.C.
VINSW
BCAP
VIN0
VOUT5
FB1
INV1
VOUT4
ADJ4
VOCAL
CLCAL
VIN4
VIN3
ADJ3
VOUT3
GND2
RT
GND1
SYNC
SCL
SDA
REG4OCB
BSENS
ECO
REG4EN
EN
ADJ5
Figure 1. Pin Configuration(s)
Pin Description
Pin
NO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
Symbol
GATE1
SNSL
SNSH
VIN2
N.C.
GND3
VOUT2
ADJ2
VOUT1
ADJ1
VIN1
VOUT0
INV2
FB2
SW2
GND4
HSW
N.C.
VINSW
BCAP
VIN0
VOUT5
Ground
REG2 voltage output
REG2 output voltage adjustment
REG1 voltage output
REG1 output voltage adjustment
Power supply for built-in FET REG1
STBREG voltage output
DCDC2 Error Amp Input
DCDC2 Error Amp output
DCDC2 switching output
Ground
High side switch output
－
Power supply for high side switch
Back-up capacity connection pin
Battery power supply connection pin
REG5 voltage output
Function
DCDC1 outside FET gate drive
DCDC1 current detection
DCDC1 current detection
Power supply for built-in FET REG2
－
Pin
NO
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
Symbol
ADJ5
EN
REG4EN
ECO
BSENS
REG4OCB
SDA
SCL
SYNC
GND1
RT
GND2
VOUT3
ADJ3
VIN3
VIN4
CLCAL
VOCAL
ADJ4
VOUT4
INV1
FB1
Function
REG5 output voltage adjustment
Enable
REG4 Enable
Low power mode switch
Error flag output
Error flag output
I C-bus data input
I C-bus clock input
External synchronization signal input
Ground
Oscillator frequency setting
Ground
REG3 voltage output
REG3output voltage adjustment
Power supply for built-in FET REG3
Power supply for built-in FET REG4
REG4 over current protection setting
REG4 output USB cable impedance
calibration setting
REG4 output voltage adjustment
REG4 voltage output
DCDC1 Error Amp Input
DCDC1 Error Amp output
2
2
“N.C” pins are not connected into internal circuits.
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BD49101ARFS-M
Block Diagram
TSD
Ext CLK
SYNC
31
33
3
2
SNSH
SNSL
GATE1
FB1
RT
OSC
INTERNAL
REGULATOR
DCDC1
(Controller)
1
DCDC1
output
44
43
15
VIN0
INV1
SW2
21
DCDC2
output
BCAP
20
BCLDET
/BCOVP
DCDC2
14 FB2
13
12
VIN2
INV2
VOUT0
4
REG2
output
STB_REG
REG2
LDET/OVP
VOUT2 7
ADJ2
8
11
VIN1
REG5
output
VOUT5
22
ADJ5
23
REG5
REG1
9
10
VOUT1
ADJ1
REG1
output
VINSW
19
37
VIN3
Hi-side SW
output
17
HSW
Hside
SW
REG3
35
36
VOUT3
ADJ3
REG3
output
BSENS
REG4OCB
ECO
EN
REG4EN
27
28
26
24
25
29
30
38
VIN4
42
41
VOUT4
ADJ4
REG4
output
REG4
(calibrate)
40
SDA
SCL
VOCAL
I
2
C I/F
32
GND1
・Each
ch on/off
・LDET
setting
39
CLCAL
34
6
16
GND2 GND3 GND4
Figure 2. Block Diagram
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BD49101ARFS-M
Description of Blocks
・DCDC2
– STBREG Switch Function
The ECO input is used to switch between operating mode and low power standby mode.
(This function is for a 3.3V I/O microcomputer because of the 3.3V fixed STBREG output)
The function of the ECO input is as follows:
ECO = H
– Normal Operating Mode
(DCDC2 operating).
ECO = L
– Low Power Standby Mode
(STBREG operating).
・Sequence
of VIN0 start up, Low Power Standby mode
VIN0
8.3V
①
BCAP
4.7V
Soft start
Max 5ms
DCDC2/
STBREG
=VIN1
DCDC2
1.25V
STBREG
DCDC2
STBREG
REG1
1.25V
②
ECO
BSENS
EN
ACK
SCL
SDA
Slave Address A
Figure 3. Timing Chart of VIN0 start up, Low Power Standby Mode
When BD49101ARFS starts up, it starts in the normal operation mode (DCDC2 operation), independent of ECO
setting. An internal regulator, the reference voltage circuit, and the OSC circuit start up when the voltage of the
BCAP pin exceeds low voltage protection release voltage (4.7V).
2
②
Following the first access to the I C interface, the ECO input is able to control the operating mode (normal or low
2
power standby). ECO must be set to the desired operating mode prior to accessing the I C interface for the first
time.
③
The conditions of independent of ECO setting is shown below.
Input power supply for VIN0 at the first time
BCAP voltage becomes under 4.5V
DCDC2 detects over current and DCDC2 restarts
2
At each condition ECO setting become effective after you send I C command and receive ACK.
①
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BD49101ARFS-M
・Relations
of BCAP Voltage and Operating Mode
When the voltage of the BCAP pin decreases under BCAP low voltage detection voltage (4.5V),
the registers are initialized and the ECO pin setting becomes invalid and forcibly changed to low power mode.
Afterwards, when BCAP voltage increases over BCAP low detection release voltage (4.7V)
without under POWER ON reset voltage (3.1V), the mode change to DCDC2 mode. (ECO pin setting is invalid.)
If BCAP voltage increases with under POWER ON reset voltage, the operation is same as VIN0 start up.
BCAP voltage
4.7V
4.5V
3.1V
BCLDET release
BCLDET detect
POWER_ON reset voltage
0V
µ-con 3.3V supply
voltage
OFF
DCDC2
STBREG
DCDC2
STBREG
OFF
DCDC2
Figure 4. Relation of BCAP Voltage and Operating Mode
・Mode
Changing (Normal Operation Mode
⇔
Low Power Mode)
When the ECO pin is changed from “L” to “H”, it changes from the low power mode to the normal operation mode.
When it changes from the low power mode to the normal operation mode, the output voltage drops according to the
load current. (Figure 5)
(ex.)
：Supply
Voltage 14.4V, Output Capacitor 100µF, Load Current 200mA: Output Drop Voltage= -80mV(Typ)
We recommend that you save consumption current of the microcomputer in 200mA within 1ms when the mode is
changed to normal operation mode (Figure 6).
3.3V
ECO
0V
3.3V
VOUT0
½80mV
（Output
Capa=100
µ
F,Load Current 200mA）
Figure 5. Timing Chart of Mode Changing (Normal Operation Mode
⇔
Low Power Mode)
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