Automotive Body
Power Management LSI Series
LED Driver IC
BD8115F-M
●Description
The BD8115F is a serial parallel control LED driver with 35V input voltage rating.
Responding to the 3-line serial data, it turns the 8ch open drain output on/off.
Due to its compact size, it is optimal for small spaces.
rev. 0.4
rev. 0.34
●Features
1) Open Drain Output
2) 3-line Serial Control + Enable Signal
3) Internal Temperature Protection Circuit (TSD)
4) Cascade Connection Compatible
5) SOP16
6) Internal 8ch Power Transistor
Applications
These ICs can be used with car and consumer electronic.
●Absolute
Maximum Ratings (Ta=25℃)
Item
Power Supply Voltage
Output Voltage（Pin No : 3½6, 11½14）
Input Voltage（Pin No : 2, 7, 8, 10, 15）
Power Dissipation
Operating Temperature Range
Storage Temperature Range
Drive Current (DC)
Drive Current（Pulse）
Junction Temperature
Symbol
VCC
VDmax
VIN
Pd
Topr
Tstg
IomaxD
IomaxP
Tjmax
Value
7
35
-0.3½VCC
560*
-40½+105
-55½+150
50
150**
150
Unit
V
V
V
mW
℃
℃
mA
mA
℃
* Pd decreased at 4.48mW/℃ for temperatures above Ta=25℃,mounted on 70×70×1.6mm Glass-epoxy PCB.
** Do not however exceed Pd. Time to impress≦200msec
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© 2009 ROHM Co., Ltd. All rights reserved.
1/12
2009.12 - Rev.0.34
BD8115F-M
Technical Note
●Operational
Conditions (Ta=-40~105℃)
Item
Power Supply Voltage
Drive Current
Symbol
Vcc
Io
Standard Value
Min
4.5
-
Typ
5
20
Max
5.5
40
Unit
V
mA
* This product is not designed for protection against radioactive rays.
●Electrical
Characteristics (Unless specified, Ta=-40~105℃ Vcc=4.5½5.5V)
Item
Symbol
Standard Value
Min
Typ
Max
Unit
Conditions
【Output
D0½D7】
（Pin
No : 3½6, 11½14）
ON Resistor
Output leakage current
【Logic
input】
（Pin
No : 2, 7, 8, 10, 15）
Upper limit threshold voltage
Bottom limit threshold voltage
Hysteresis width
Serial clock frequency
Input Current
Input leakage Current
【WHOLE】
Circuit Current
ICC
-
0.3
5
mA
Serial Data Input,
VCC=5V,CLK=500KHz,
SEROUT=OPEN
RST_B=OPEN,
SEROUT=OPEN
VTH
VTL
VHYS
FCLK
IIN
IINL
Vcc
×0.8
-
0.15
-
20
-
-
-
0.3
-
50
0
-
Vcc
×0.2
0.45
1.25
100
5
V
V
V
MHz
uA
uA
VIN=5V
VIN=0V
VCC=5V
RON
IDL
-
-
6
0
12
5
Ω
uA
I
D
=20mA
V
D
=34V
Static Current
【SER
OUT】(Pin No. : 9)
Output Voltage high
Output voltage Low
ISTN
-
0
50
uA
VOH
VOL
4.6
-
4.8
0.2
-
0.4
V
V
VCC=5V, ISO=-4mA
VCC=5V, ISO=4mA
* This product is not designed for protection against radioactive rays.
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© 2009 ROHM Co., Ltd. All rights reserved.
2/12
2009.12 - Rev.0.34
BD8115F-M
●Electrical
Characteristic Diagrams (Unless otherwise specified Ta=25℃)
Technical Note
450
OUTPUT ON RESISTANCE：RON[Ω]
9
400
310
SUPPLY CURREN T：Icc[μA]
25℃
5.0V
5.5V
8
7
6
5
4
3
2
1
0
105℃
SUPPLY CURRENT ：Icc[μA]
350
300
105℃
250
200
150
100
50
0
0
290
270
250
-40℃
4.5V
25℃
-40℃
230
210
1
2
3
4
SUPPLY VOLTAGE：Vcc[V]
5
-40
-15
10
35
60
85
4.5
AMBIENT TEMPERATURE ： Ta[℃]
4.7
4.9
5.1
5.3
SUPPLY VOLTAGE：Vcc[V]
5.5
Fig.1 Circuit current
（VCC
characteristic）
9
OUTPUT ON RESISTANCE ： RON[Ω]
8
7
6
5
4
3
2
1
0
-40
-15
10
35
60
85
Fig.2 Circuit current
（Temperature
characteristic）
300
Fig.3 Output on resistance
（VCC
characteristic @ IDD=20mA）
6.0
4.5V
250
OUTPUT VOLTAGE ： [mV]
OUTPU T VOLTAGE ： VOH[V]
4.5V
5V
200
5.5
5V
150
-40℃
5.0
5.5V
5.5V
100
50
0
10
20
30
40
INPUT CURRENT： I
D
[mA]
50
4.5
25℃
105℃
4.0
4.5
4.7
4.9
5.1
5.3
SUPPLY VOLTAGE： Vcc[V]
5.5
AMBIENT TEMPERATURE ： Ta[℃]
Fig.4 Output on resistance
（Temperature
characteristic @ IDD=20mA）
6.0
Fig.5 Output on resistance
（IDD
characteristic）
0.30
Fig.6 SEROUT high side voltage
（VCC
characteristic @ ISO=-5mA）
0.30
105℃
5.5V
OUTPUT VOLTAGE ： VOH[V]
5.5
OUTPUT VOLTAGE ： VOL[V]
0.25
5V
5.0
OUTPU T VOLTAGE ： VOL[V]
25℃
0.25
0.20
0.15
0.10
0.05
0.00
4.5V
0.20
0.15
5.5V
5V
-40℃
0.10
0.05
0.00
4.5
4.0
-40
-15
10
4.5V
35
60
85
4.5
4.7
4.9
5.1
5.3
5.5
-40
AMBIENT TEMPERATURE ： Ta[℃]
SUPPLY VOLTAGE ： Vcc[V]
-15
10
35
60
85
AMBIENT TEMPERATURE ： Ta[℃]
Fig.7 SEROUT high side voltage
（Temperature
characteristic @ ISO=-5mA）
Fig.8 SEROUT low side voltage
（VCC
characteristic @ ISO=5mA）
Fig.9 SEROUT low side voltage
（Temperature
characteristic @ ISO=4mA）
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© 2009 ROHM Co., Ltd. All rights reserved.
3/12
2009.12 - Rev.0.34
BD8115F-M
●Block
Diagram
Technical Note
TSD
VCC
1
D
Q
CK CLR
D
Q
CK CLR
16
GND
SERIN
2
D
Q
CK CLR
D
Q
CK CLR
15
CLK
D
Q
CK CLR
D
Q
CK CLR
D0
3
D
Q
CK CLR
D
Q
CK CLR
14
D7
D
Q
CK CLR
D
Q
CK CLR
D1
4
D
Q
CK CLR
D
Q
CK CLR
13
D6
D2
5
D
Q
CK CLR
D
Q
CK CLR
12
D5
D
Q
CK CLR
D
Q
CK CLR
D3
6
D
Q
CK CLR
11
D4
RST_B
7
10
LATCH
SDWN
8
9
SEROUT
Fig.10
●Pin
Setup Diagram
BD8115FV（SOP16）
●Terminal
Number・Terminal Name
Pin
Number
1
2
3
16
15
14
13
12
11
10
9
Terminal
Name
VCC
SERIN
D0
D1
D2
D3
RST_B
SDWN
SEROUT
LATCH
D4
D5
D6
D7
CLK
GND
Function
Power supply voltage input terminal
Serial data input terminal
Drain output terminal 0
Drain output terminal 1
Drain output terminal 2
Drain output terminal 3
Reset return input terminal
(L:FF data 0)
Shut down input terminal
(H: Output OFF)
Serial data output terminal
Latch signal input terminal
(H: Data latch)
Drain output terminal 4
Drain output terminal 5
Drain output terminal 6
Drain output terminal 7
Clock input terminal
GND terminal
VCC
SERIN
D0
D1
D2
D3
RST_B
SDWN
1
2
3
4
5
6
7
8
GND
CLK
D7
D6
D5
D4
LATCH
SEROUT
4
5
6
7
8
9
10
11
12
13
14
15
16
Fig.11
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© 2009 ROHM Co., Ltd. All rights reserved.
4/12
2009.12 - Rev.0.34
BD8115F-M
●Block
Operation
1）Serial I/F
The I/F is a 3-line serial (LATCH, CLK, SERIN) style.
8-bit output ON/OFF can be set-up. This is composed of shift register. + 8-bit register.
2）Driver
It is a 8-bit open drain output.
Technical Note
3）TSD (Thermal Shut Down)
To prevent heat damage and overheating, when the chip temperature goes over approximately 175℃, the output turns
off. When the temperature goes back down, normal operation resumes. However, the intended use of the
temperature protection circuit is to protect the IC, so please construct thermal design with the junction temperature
Tjmax under 150℃.
●Application
Circuit
VCC
10uF
VBAT
10uF
↓IF
Rres
VF
VCC
SDWN
LATC
H
RST_B
CLK
SERIN
SEROUT
GND
D0
D1
D2
D3
D4
D5
D6
D7
Micro -
computer
VCC
10uF
VCC
SDWN
LATC
H
RST_B
CLK
SERIN
SEROUT
GND
D0
D1
D2
D3
D4
D5
D6
D7
IF=
Fig.12
VBAT - VF
Rres + RON
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© 2009 ROHM Co., Ltd. All rights reserved.
5/12
2009.12 - Rev.0.34
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