Datasheet Isolated Power Supply IC for Automotive 1 Channel Step-up Switching Regulator Controller BD9031FV-C General Description Key specification The BD9031FV-C is a 1 channel isolated and step-up Operating supply voltage range: 4.5V to 30V switching regulator (controller). Switching frequency: 20kHz to 600kHz BD9031FV-C features a wide range of integrated safety Pch FET ON resistance: 6 (typ.) functions, e.g. input undervoltage protection, output Nch FET ON resistance: 0.84 (typ.) overvoltage protection, output undervoltage protection, Standby current: 0A (typ.) overcurrent protection and thermal shutdown. Operating temperature range: -40C to +125C Features Packages W (typ.) x D (typ.) x H (max.) Maximum supply voltage 35V SSOP-B16 5.00mm x 6.40mm x 1.35mm Accurate reference voltage 1.5% Adjustable frequency: 20kHz to 600kHz Integrated EN functionality Current mode control Input undervoltage protection (UVLO) Overheating protection (TSD) Output overvoltage protection (OVP) Output undervoltage protection (UVP) Overcurrent protection (OCP) SSOP-B16 package Application Automotive isolated power supplies SSOP-B16 Typical Application Circuits VREF BG ENABLE TSD ShutDown RT OSC OCP OC DC/DC OUTPUT SD Set DRV Reset TSD SW Slope UVLO VREG PROTECT LOGIC LOGIC PWM OUT COMP OVP OSC Err OCP FB VREF UVP Amp PGND SS CLAMP COMP OVP UVP Figure 1. Block Diagram and Typical Application Circuit This product is a monolithic silicon integrated circuit This product is not designed to be radiation resistant. www.rohm.com TSZ02201-0T3T0AN00010-1-2 2012 ROHM Co., Ltd. All rights reserved. 1/23 TSZ2211114001 17.JUL.2014 Rev.003 EN VREG GND VccBD9031FV-C Pin Configuration (TOP VIEW) 1 16 N.C. PGND 2 15 N.C. N.C. OUT 3 14 OC VREG 4 13 SS SD 5 12 RT FB 6 11 N.C. COMP 7 10 EN 8 9 GND Vcc Figure 2. Pin Configuration Pin Description Pin No. Pin Name Function 1 N.C. Not connected 2 N.C. Not connected 3 OUT Gate driver output pin 4 VREG Regulator output for FET driver pin 5 SD Transistor driver pin for shutdown 6 FB Error amplifier inverted input pin 7 COMP Error amplifier output pin 8 GND Ground pin 9 Vcc Power supply pin 10 EN EN functionality pin 11 N.C. Not connected 12 RT Frequency setting pin 13 SS Soft start setting pin 14 OC Overcurrent detection pin 15 N.C. Not connected 16 PGND Power ground pin www.rohm.com TSZ02201-0T3T0AN00010-1-2 2012 ROHM Co., Ltd. All rights reserved. 2/23 TSZ2211115001 17.JUL.2014 Rev.003