Datasheet 40 V 600 mA 1ch Constant Current Driver for Automotive LED Lamps BD18326NUF-M General Description Key Specifications The BD18326NUF-M is a constant current driver IC for Input Voltage Range: 5.5 V to 20 V driving automotive LED lamp, that can withstand up to 40 Output Current Accuracy: 5 % V. Small-size package is suitable for use in socket LED Maximum Output Current: 400 mA (DC) driver applications. 600 mA (ON Duty: 50 %) The BD18326NUF-M offers high reliability with built-in Operating Temperature Tj: -40 C to +150 C functions for the thermal de-rating function, the LED open detection, the output short circuit protection, the SET pin Package W (Typ) x D (Typ) x H (Max) short circuit protection, the over-voltage mute function, the VSON10FV3030 3.0 mm x 3.0 mm x 1.0 mm current bypass function at reduced-voltage, the output for fault flag function and the input for output current OFF control signal. Features (Note 1) AEC-Q100 Qualified Functional Safety Supportive Automotive Products CR Timer for PWM Dimming Thermal De-rating Function (THD) LED Open Detection Output Short Circuit Protection (OUT SCP) SET Pin Short Circuit Protection (SET SCP) Over Voltage Mute Function (OVM) Current Bypass Function at Reduced-Voltage Disable LED Open Detection Function at Reduced-Voltage (OPM) Output for Fault Flag / Input for Output Current OFF Control Signal (PBUS) (Note 1) Grade1 Applications Automotive LED Exterior Lamps (Rear Lamp, Turn Lamp, DRL/Position Lamp, Fog Lamp) Automotive Interior Lamps (Air Conditioner Lamp, Interior Light, Cluster Light etc.) Typical Application Circuit PWM SW D1 OUT VIN C OUT BD18326NUF-M D2 CVIN DC SW D3 CRT R C R ISINK DCIN CRT CRT EXP-PAD +B DISC THD PBUS RBP1 SET R NTC SET BPCNT GND R BP3 R BP2 Product structure: Silicon integrated circuit This product has no designed protection against radioactive rays. www.rohm.com TSZ02201-0T1T0B300340-1-2 2020 ROHM Co., Ltd. All rights reserved. 1/36 TSZ22111 14 001 28.Sep.2020 Rev.001 BD18326NUF-M Pin Configuration (TOP VIEW) EXP-PAD Pin Descriptions Pin No. Pin Name Function 1 VIN Power supply input (Note 1) 2 BPCNT Current bypass function at reduced-voltage setting (Note 2) 3 PBUS Output for fault flag / Input for output current OFF control signal (Note 3) 4 CRT CR timer setting 1 (Note 3) 5 DISC CR timer setting 2 (Note 4) 6 THD Thermal de-rating setting (Note 1) 7 SET Output current setting 8 GND GND 9 ISINK Current sink pin for current bypass function at reduced-voltage 10 OUT Current output - EXP-PAD Heat radiation pad. The EXP-PAD is connected to GND. (Note 1) Do not connect external capacitor. (Note 2) Open the PBUS pin when not in use output for fault flag / input for output current OFF control signal. (Note 3) Short the CRT pin to the VIN pin and open the DISC pin or connect it to GND when in use at DC mode only. (Note 4) Open the THD pin when not in use thermal de-rating function. www.rohm.com TSZ02201-0T1T0B300340-1-2 2020 ROHM Co., Ltd. All rights reserved. 2/36 TSZ22111 15 001 28.Sep.2020 Rev.001 1.VIN 10.OUT 2.BPCNT 9.ISINK 3.PBUS 8.GND 4.CRT 7.SET 5.DISC 6.THD