Datasheet
For Automotive, 40 V 150 mA 4ch
Constant Current LED Driver
BD18337EFV-M BD18347EFV-M
General Description
BD18337EFV-M
/
BD18347EFV-M
are
40
V-withstanding constant current LED driver for
automotive applications. It is a 4 channel LED driver with
the built-in energy sharing control which can realize to
make the board size small. High reliability can be
realized with LED Open Detection, the OUTx (all later
x=1 to 4) pin Short Circuit Protection, Over Voltage Mute
and Thermal Shutdown Function. In case the output
OUTx pin has 3 LEDs in series, BD18337EFV-M has to
be used, in case of 2 LEDs in series, BD18347EFV-M
has to be used.
Key Specifications
Input Voltage Range:
5.5 V to 20.0 V
Maximum Output Current:
150 mA/ch
Output Current Accuracy:
±5 %
Relative Channel Accuracy:
±5 %
Operating Temperature Range: -40 °C to +125 °C
W (Typ) x D (Typ) x H (Max)
5.00 mm x 6.40 mm x 1.00 mm
Package
HTSSOP-B16
Features
AEC-Q100 Qualified
(Note 1)
Energy Sharing Control
PWM Dimming Function
License Lamp Mode
LED Open Detection
OUTx pin Short Circuit Protection (SCP)
Over Voltage Mute Function (OVM)
Disable LED Open Detection Function
at Reduced-Voltage
LED Failure Input / Output Functions (PBUS)
(Note 1)
Grade1
Applications
Automotive LED Exterior Lamp
(Rear Lamp, License Lamp, DRL / Position Lamp,
Fog Lamp etc.)
Automotive LED Interior Lamp
(Air Conditioner Lamp, Interior Lamp, Cluster Light
etc.)
Typical Application Circuit
R
EXT
PWM_in
D1
Z
D1
D2
C
VIN1
C
VIN2
VINRES
OUT1
VIN
CRT
OUT2
OUT3
OUT4
C
OUT4
C
OUT3
C
OUT2
C
OUT1
DC_in
D3
C
CRT
R
CRT
DISC
BD18337EFV-M
+B
BD18347EFV-M
MSET1
MSET2
PBUS
GND
SET1
SET2
SET3
SET4
R
SET4
R
SET3
R
SET1
R
SET2
〇Product
structure : Silicon integrated circuit
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〇This
product has no designed protection against radioactive rays
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BD18337EFV-M BD18347EFV-M
Pin Configuration
VINRES
VIN
PBUS
CRT
DISC
MSET1
SET1
SET2
1
2
3
4
5
6
7
8
(TOP VIEW)
16
15
14
13
EXP- PAD
OUT1
OUT2
OUT3
OUT4
GND
MSET2
SET3
SET4
12
11
10
9
Pin Description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
-
Pin Name
VINRES
VIN
PBUS
CRT
DISC
MSET1
SET1
SET2
SET4
SET3
MSET2
GND
OUT4
OUT3
OUT2
OUT1
EXP-PAD
Function
Energy sharing external resistor connection
(Note 1)
Supply voltage input
Output for fault flag / Input to disable output current
CR TIMER setting1
(Note 2)
CR TIMER setting2
(Note 3)
Mode setting pin 1
Output current setting pin 1
Output current setting pin 2
Output current setting pin 4
Output current setting pin 3
Mode setting pin 2
GND
Current output pin 4
Current output pin 3
Current output pin 2
Current output pin 1
The EXP-PAD connect to GND.
(Note 1)
Short the VINRES pin to the VIN pin when not in use.
(Note 2)
Short the CRT pin to the VIN pin when not in use.
(Note 3)
Open the DISC pin or connect it to GND when not in use.
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BD18337EFV-M BD18347EFV-M
Block Diagram
V
B G
: Internal Reference Voltage
VINRES
V
BG
VIN
Energy
Sharing
Control
Bandgap
VREG
V
BG
OVM
to Current
Setting
Block
Current
Driver
OUT1
OPENLOAD
OUT2
OUT3
OUT4
V
B G
V
B G
OPM
PBUS
PBUS
V
B G
V
B G
V
INRE S
0.05 V
MSET1
MSET2
V
RE G
Control
Logic
SCP
0.6 V⇔0.8 V
CRT
V
B G
CR
TIMER
SETx
Pin
Short
Detect
Current
Setting
V
BG
from OVM
Block
DISC
V
B G
GND
SET1 SET2 SET3 SET4
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BD18337EFV-M BD18347EFV-M
Absolute Maximum Ratings (Ta=25 °C)
Parameter
Supply Voltage (VIN)
Supply Voltage (VINRES)
VIN to VINRES Pin Voltage
CRT, DISC Pin Voltage
MSET1, MSET2 Pin Voltage
OUT1,OUT2,OUT3,OUT4 Pin Voltage
PBUS Pin Voltage
Storage Temperature Range
Maximum Junction Temperature
Symbol
V
IN
V
INRES
V
VIN_VINRES
V
CRT
, V
DISC
V
MSET1
, V
MSET2
V
OUT1
, V
OUT2
, V
OUT3
, V
OUT4
V
PBUS
Tstg
Tjmax
Rating
-0.3 to +40.0
-0.3 to +40.0 < V
IN
-0.3 to +10.0
-0.3 to +40.0
-0.3 to +20.0
-0.3 to V
IN
+0.3V
-0.3 to +20.0
-55 to +150
150
Unit
V
V
V
V
V
V
V
°C
°C
Caution 1:
Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is
operated over the absolute maximum ratings.
Caution 2:
Should by any chance the maximum junction temperature rating be exceeded the rise in temperature of the chip may result in deterioration of the
properties of the chip. In case of exceeding this absolute maximum rating, design a PCB with thermal resistance taken into consideration by
increasing board size and copper area so as not to exceed the maximum junction temperature rating.
Thermal Resistance
(Note 1)
Parameter
HTSSOP-B16
Junction to Ambient
Junction to Top Characterization Parameter
(Note 2)
θ
JA
Ψ
JT
113
13
36
9
°C/W
°C/W
Symbol
Thermal Resistance(Typ)
1s
(Note 3)
2s2p
(Note
4)
Unit
(Note 1)
Based on JESD51-2A(Still-Air), using a BD18347EFV-M Chip.
(Note 2)
The thermal characterization parameter to report the difference between junction temperature and the temperature at the top center of the outside
surface of the component package.
(Note 3)
Using a PCB board based on JESD51-3.
(Note 4)
Using a PCB board based on JESD51-5, 7.
Layer Number of
Measurement Board
Single
Top
Copper Pattern
Footprints and Traces
Layer Number of
Measurement Board
4 Layers
Top
Copper Pattern
Footprints and Traces
Material
FR-4
Thickness
70 μm
Material
FR-4
Thickness
70 μm
Board Size
114.3 mm x 76.2 mm x 1.57 mmt
Board Size
114.3 mm x 76.2 mm x 1.6 mmt
2 Internal Layers
Copper Pattern
74.2 mm x 74.2 mm
Thickness
35 μm
Thermal Via
(Note 5)
Pitch
Diameter
1.20 mm
Φ0.30 mm
Bottom
Copper Pattern
74.2 mm x 74.2 mm
Thickness
70 μm
(Note 5)
This thermal via connects with the copper pattern of all layers.
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BD18337EFV-M BD18347EFV-M
Recommended Operating Conditions
Parameter
Supply Voltage (VIN)
(Note 1)
Output Current (each channel)
CR Timer Frequency
PWM Minimum Pulse Width
Operating Temperature
(Note 1)
ASO should not be exceeded.
Symbol
V
IN
I
OUTx
f
PWM
t
MIN
Topr
Min
5.5
-
-
100
-40
Typ
13.0
-
-
-
-
Max
20.0
150
750
-
+125
Unit
V
mA
Hz
µs
°C
Operating Conditions
Parameter
Capacitor
Connecting VIN Pin 1
Capacitor
Connecting VIN Pin 2
Capacitor
Connecting LED Anode
Capacitor
for Setting CR Timer
Resistor
for Setting CR Timer
Resistor
for Setting Output Current
(Note 2)
Recommended ceramic capacitor.
Symbol
C
VIN1
(Note 2)
C
VIN2
(Note 2)
C
OUT1,
C
OUT2,
C
OUT3,
C
OUT4
(Note 2)
C
CRT
(Note 2)
R
CRT
R
SET1,
R
SET2,
R
SET3,
R
SET4
Min
1.0
0.047
0.01
0.01
0.1
12
Max
-
-
0.47
0.22
50
36
Unit
μF
μF
μF
μF
kΩ
kΩ
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