BD18378EFV-ME2 ROHM

Advanced 12 Channel Constant Current LED Driver IC BD18378EFV-M General Description Key Specifications The BD18378EFV-M is a serial input controlled constant Input voltage range: 3V to 5.5V current LED driver with 8 V output rating. 6 bit current Output voltage range: 0.5V to 8V calibration is available for each output while a selected Output Current range: 10mA to 50mA PWM input performs dimming on the corresponding Output Current accuracy 3.5% output. The BD18378EFV-M is able to perform diagnostic Maximum clock frequency: 1.25MHz (open / short / temperature) checks to detect LED failure Operating current: 4mA (Typ.) and over temperature on chip. Fault detection is Operating temperature range: - 40C to +105C performed also during LED deactivated state. The settings of all internal registers can be read out to verify Package L(Typ.) x W(Typ.) x H(Max.) written information at any time. HTSSOP-B28 9.70mm x 6.40mm x 1.00mm Features (Note1) AEC-Q100 Qualified 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. Applications Open Drain Fault indicator. Automotive illumination & ambient light Read-back of all register settings. Consumer electronics illumination 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 LEDs 8V max R V P LED CLED 3 4 5 V ERR 0 1 2 6 7 8 9 10 11 SENSE CC CHANNEL 5.5V max V CC C IN BD18378EFV-M Heat Sink Noisy Quiet ground line PWM ground line PGND IREF 0 1 2 3 4 5 SDI CLK SDO LATCH AGND R EXT to Controller Figure 1. Typical application diagram Product structureSilicon monolithic integrated circuit This product is not designed protection against radioactive rays .ww w.rohm.co TSZ02201-0W1W0C500020-1-2 2015 ROHM Co., Ltd. All rights reserved. m 1/26 TSZ2211114001 04. Dec. 2015 Rev.004 to ControllerBD18378EFV-M Pin Configuration HTSSOP-B28 (TOP VIEW) AGND PGND 1 28 IREF 2 27 VCC ERR 3 26 SDO PWM0 4 25 PWM5 CH0 5 24 CH11 Heat Sink CH1 CH10 6 23 CH2 7 Bottom 22 CH9 Side CH3 CH8 8 21 CH4 9 20 CH7 CH5 CH6 10 19 PWM1 11 18 SENSE PWM2 PWM4 12 17 SDI 13 16 PWM3 CLK LATCH 14 15 Figure 2. Pin Configuration Pin Description Pin Pin Symbol Function Symbol Function No. No. 1 AGND Analog ground terminal 28 PGND Power ground terminal 2 IREF Current setting terminal 27 VCC Power supply terminal 3 ERR Open drain fault indicator 26 SDO Serial data output terminal 4 PWM0 PWM 0 input terminal 25 PWM5 PWM 5 input terminal 5 CH0 Output channel 0 24 CH11 Output channel 11 6 CH1 Output channel 1 23 CH10 Output channel 10 7 CH2 Output channel 2 22 CH9 Output channel 9 8 CH3 Output channel 3 21 CH8 Output channel 8 9 CH4 Output channel 4 20 CH7 Output channel 7 10 CH5 Output channel 5 19 CH6 Output channel 6 11 PWM1 PWM 1 input terminal 18 SENSE LED supply sensing terminal 12 PWM2 PWM 2 input terminal 17 PWM4 PWM 4 input terminal 13 SDI Serial data input terminal 16 PWM3 PWM 3 input terminal 14 CLK Serial communication clock 15 LATCH Latch signal input terminal www.rohm.co TSZ02201-0W1W0C500020-1-2 2015 ROHM Co., Ltd. All rights reserved. m 2/26 TSZ2211115001 04. Dec. 2015 Rev.004