Datasheet 4.2V to 18V Input 1ch Buck Controller BD9305AFVM General Description Key Specifications BD9305AFVM is a 1-channel DC/DC converter Power Supply Voltage Range: 4.2V to 18V controller. A Step-down DC/DC converter can be Error Amplifier Feed Back Voltage: 1.251.6% configured by BD9305AFVM. In addition, it has a built-in Oscillating Frequency Range: 100kHz to 800kHz master-slave function which improves synchronization. Standby Current: 0A(Typ) Operating Temperature Range: -40C to +85C Features Package W(Typ) x D(Typ) x H(Max) 1ch PWM Controlled DC/DC Converter Controller Built-in Soft Start Function Built-in Master / Slave Function Protection Circuits: Under Voltage Lockout Protection Circuit Thermal Shutdown Circuit Short Protection Circuit of Timer Latch type Applications TV, Power Supply for the TFT-LCD Panels used for LCD TVs, Back Lights DSC, DVC, Printer, DVD ,DVD Recorder, General Consumer Equipment, etc. MSOP8 2.90mm x 4.00mm x 0.90mm Typical Application Circuit 10000pF V CC 5.1k FB COMP GND VCC 10 F 8 7 6 5 Soft Err Start 0.5 1.25V VREF Timer Latch (When Outpu t Short, UVLO Protect Fall VCC) TSD Shut Down Shut Down 47H VOUT DRV PWM OSC 1k VCC 20uF 30 470pF ENABLE 10 1 2 3 4 RT CT ENB GD 20k 200pF 10k VCC Figure 1. Typical Application Circuit Product structureSilicon monolithic integrated circuit This product has no designed protection against radioactive rays www.rohm.com TSZ02201-0323AAJ00560-1-2 2014 ROHM Co., Ltd. All rights reserved. 1/19 TSZ22111 14001 09.Sep.2014 Rev.001BD9305AFVM Pin Configuration TOP VIEW Pin Descriptions Pin No Pin Name Function 1 RT External timing resistor pin 2 CT External timing capacitor pin 3 ENB Control pin 4 GD Gate drive output pin 5 VCC Power supply pin 6 GND Ground pin 7 COMP Error amp output pin 8 FB Error amp inversion input pin Block Diagram FB GND VCC COMP 7 6 8 5 Soft Err Start 1.25V Vref Timer Latch UVLO TSD Shut Down Shut Down PWM DRV OSC VCC ENABLE 1 2 3 4 ENB GD RT CT www.rohm.com TSZ02201-0323AAJ00560-1-2 2014 ROHM Co., Ltd. All rights reserved. 2/19 TSZ22111 15001 09.Sep.2014 Rev.001