General Description 

   BD9B400MUV is a synchronous buck switching  regulator with built-in low on-resistance power MOSFETs.  This IC, which is capable of providing current up to 4A,  features fast transient response by employing constant  on-time control system. It offers high oscillating  frequency at low inductance. With its original constant  on-time control method which operates low consumption  at light load, this product is ideal for equipment and  devices that demand minimal standby power  consumption.

Features

n Synchronous Single DC/DC Converter

n Constant on-time control suitable to Deep-SLLM 

n Over Current Protection

n Short Circuit Protection

n Thermal Shutdown Protection

n Under Voltage Lockout Protection

n Adjustable Soft Start 

n Power Good Output

n VQFN016V3030 Package

(backside heat dissipation)

Applications

n Step-down Power Supply for DSPs, FPGAs, 

Microprocessors, etc. 

n Laptop PCs/Tablet PCs/Servers

n LCD TVs

n Storage Devices (HDDs/SSDs)

n Printers, OA Equipment 

n Entertainment Devices

n Distributed Power Supply, Secondary Power Supply