Datasheet 4ch White LED Driver Built-in Current Driver Buck-Boost and Boost DC/DC Converter for Automotive BD81A24EFV-M BD81A24MUV-M General Description Key Specifications BD81A24EFV-M / BD81A24MUV-M is a white LED Operating Input Voltage Range 4.5 V to 35 V driver with the capability of withstanding high input Output LED Current Accuracy 3.0 % 50 mA voltage (maximum 35 V). This driver has 4ch constant- DC/DC Oscillation Frequency 200 kHz to 2200 kHz current drivers in 1-chip, where each channel can draw Operating Temperature -40 C to +125 C up to 120 mA (Max), and it is suitable for high LED Maximum Output Current 120 mA/ch illumination LED drive. Furthermore, a buck-boost LED Maximum Dimming Ratio 10,000:1 100 Hz current mode DC/DC converter is also built to achieve PWM Minimum Pulse Width 1.0 s stable operation during power voltage fluctuation. Light modulation (10,000:1 100 Hz dimming Packages W (Typ) x D (Typ) x H (Max) function) is possible by PWM input. VQFN28SV5050 5.0 mm x 5.0 mm x 1.0 mm HTSSOP-B28 9.7 mm x 6.4 mm x 1.0 mm Features *1 AEC-Q100 Qualified 4ch Current Driver for LED Drive Buck-Boost Current Mode DC/DC Converter Control DC/DC Converter Oscillation Frequency by External Synchronized Signal LSI Protection Function (UVLO, OVP, TSD, OCP, SCP) LED Abnormality Detection Function (Open/Short) VOUT Discharge Function (Buck-Boost Structure Limitation) VQFN28SV5050 HTSSOP-B28 *1 Grade 1 BD81A24MUV-M BD81A24EFV-M Applications Automotive CID (Center Information Display) Panel Car Navigation Cluster Panel HUD (Head Up Display) Small and Medium Type LCD Panels for Automotive Use Typical Application Circuit Product structure : Silicon integrated circuit This product has no designed protection against radioactive rays This product is protected by U.S. Patent No.7,235,954, No.7,541,785, No.7,944,189. www.rohm.com TSZ02201-0T3T0C600070-1-2 2016 ROHM Co., Ltd. All rights reserved. 1/45 21.Aug.2020 Rev.005 TSZ22111 14 001 BD81A24EFV-M BD81A24MUV-M Pin Configuration VQFN28SV5050 (TOP VIEW) Pin Description Pin No. Pin Name Function 1 LEDEN1 Enable pin 1 for LED output 2 LEDEN2 Enable pin 2 for LED output 3 LED1 LED output pin 1 4 LED2 LED output pin 2 5 LED3 LED output pin 3 6 LED4 LED output pin 4 7 OVP Over voltage detection pin 8 ISET LED output current setting pin 9 PGND LED output GND pin 10 OUTL Low side FET gate pin 11 DGND DC/DC converter output GND pin 12 VDISC Output voltage discharge pin 13 SW High side FET source pin 14 OUTH High side FET gate pin 15 BOOT High side FET driver power supply pin 16 VREG Internal constant voltage 17 EN Enable pin 18 CS DC/DC converter current sense pin 19 VCC Input power supply pin 20 SS Soft Start capacitor connection 21 COMP Error Amp output 22 RT Oscillation frequency setting resistor connect 23 SYNC External synchronization input pin 24 SHDETEN Short detection enable signal 25 GND Small signal GND pin 26 PWM PWM light modulation signal input pin 27 FAIL1 Failure signal output pin 1 28 FAIL2 Failure signal output pin 2 - EXP-PAD Back side thermal PAD (Connect to GND) www.rohm.com TSZ02201-0T3T0C600070-1-2 2/45 2016 ROHM Co., Ltd. All rights reserved. 21.Aug.2020 Rev.005 TSZ22111 15 001