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Rohm Semiconductor Electronic Components Datasheet

BD18378EFV-M Datasheet

Advanced 12 Channel Constant Current LED Driver

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Advanced 12 Channel
Constant Current LED Driver IC
BD18378EFV-M
General Description
The BD18378EFV-M is a serial input controlled constant
current LED driver with 8 V output rating. 6 bit current
calibration is available for each output while a selected
PWM input performs dimming on the corresponding
output. The BD18378EFV-M is able to perform diagnostic
(open / short / temperature) checks to detect LED failure
and over temperature on chip. Fault detection is
performed also during LED deactivated state. The
settings of all internal registers can be read out to verify
written information at any time.
Features
AEC-Q100 Qualified (Note1)
Current capability: 50mA per output channel.
4-line SPI Control.
External resistor current setting.
Limp Home capability.
PWM dimming 0.2-99.2% at 200Hz
Diagnostic of all PWM inputs.
Programmable output mapping to each PWM input.
6 Bit LED brightness adjustment on each channel.
Diagnostic output on LED OPEN and SHORT for
each channel during PWM on & off time.
True LED voltage measurement.
Over Temperature Protection and Thermal
Feedback.
Open Drain Fault indicator.
Read-back of all register settings.
Outputs can be connected in parallel to achieve
more than 50mA into the load.
Slew Rate limited switching reduces
radiated Noise (EMI).
Daisy chain compatible.
(Note1: Operating Temperature Grade 2)
Typical Application Circuit Diagram
Key Specifications
Input voltage range:
Output voltage range:
Output Current range:
Output Current accuracy
Maximum clock frequency:
Operating current:
Operating temperature range:
3V to 5.5V
0.5V to 8V
10mA to 50mA
3.5%
1.25MHz
4mA (Typ.)
- 40°C to +105°C
Package
HTSSOP-B28
L(Typ.) x W(Typ.) x H(Max.)
9.70mm x 6.40mm x 1.00mm
Applications
Automotive illumination & ambient light
Consumer electronics illumination
LEDs
8V max
RP
CLED
VLED
5.5V max
VCC
VCC ERR
0 1 2 3 4 5 6 7 8 9 10 11 SENSE
CHANNEL
CIN BD18378EFV-M
Heat Sink
Noisy
ground line
PGND
Quiet
ground line
AGND
IREF
01
PWM
2 34
5
SDI CLK SDO LATCH
REXT
to Controller
Figure 1. Typical application diagram
○Product structureSilicon monolithic integrated circuit
.www.rohm.co
©m 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
○This product is not designed protection against radioactive rays
1/26
TSZ02201-0W1W0C500020-1-2
04. Dec. 2015 Rev.004


Rohm Semiconductor Electronic Components Datasheet

BD18378EFV-M Datasheet

Advanced 12 Channel Constant Current LED Driver

No Preview Available !

BD18378EFV-M
Pin Configuration
AGND
IREF
ERR
PWM0
CH0
CH1
CH2
CH3
CH4
CH5
PWM1
PWM2
SDI
CLK
HTSSOP-B28
(TOP VIEW)
1 28 PGND
2 27 VCC
3 26 SDO
4 25 PWM5
5 24 CH11
6
Heat Sink
23 CH10
7
Bottom
22 CH9
Side
8 21 CH8
9 20 CH7
10 19 CH6
11 18 SENSE
12 17 PWM4
13 16 PWM3
14 15 LATCH
Figure 2. Pin Configuration
Pin Description
Pin
No.
Symbol
Function
1 AGND Analog ground terminal
2 IREF Current setting terminal
3 ERR Open drain fault indicator
4 PWM0 PWM 0 input terminal
5 CH0 Output channel 0
6 CH1 Output channel 1
7 CH2 Output channel 2
8 CH3 Output channel 3
9 CH4 Output channel 4
10 CH5 Output channel 5
11 PWM1 PWM 1 input terminal
12 PWM2 PWM 2 input terminal
13 SDI Serial data input terminal
14 CLK Serial communication clock
Pin
No.
Symbol
Function
28 PGND Power ground terminal
27 VCC Power supply terminal
26 SDO Serial data output terminal
25 PWM5 PWM 5 input terminal
24 CH11 Output channel 11
23 CH10 Output channel 10
22 CH9 Output channel 9
21 CH8 Output channel 8
20 CH7 Output channel 7
19 CH6 Output channel 6
18 SENSE LED supply sensing terminal
17 PWM4 PWM 4 input terminal
16 PWM3 PWM 3 input terminal
15 LATCH Latch signal input terminal
www.rohm.co
m© 2015 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
2/26
TSZ02201-0W1W0C500020-1-2
04. Dec. 2015 Rev.004


Part Number BD18378EFV-M
Description Advanced 12 Channel Constant Current LED Driver
Maker ROHM
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