BD18378EFV-M Datasheet, PDF (1/30 Pages) Rohm – Advanced 12 Channel Constant Current LED Driver IC

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
23
4
5 67
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 structure：Silicon monolithic integrated circuit
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©m 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product is not designed protection against radioactive rays
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TSZ02201-0W1W0C500020-1-2
04. Dec. 2015 Rev.004