BD4959G-TR Integrated Circuits (ICs)

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The BD4959G-TR is a supervisory integrated circuit (IC) device manufactured by ROHM Semiconductor. It belongs to the PMIC — Supervisors category, and is suitable for applications related to automotive systems. It is a voltage monitor IC that monitors the supply voltage and switches a power supply from one power line to another in case of an input voltage drop, thereby providing a reliable system standby for automotive systems.

The BD4959G-TR is a one-time programmable IC that features a wide range of voltage and temperature monitoring capabilities. It has built-in power-on reset (POR) and brown-out detection (BOD) functions, and can monitor up to four external power sources. It also features an accurate power supply valid signal, which is generated when the POR or BOD conditions are met, and can be used to provide power supply ready signals for peripheral devices.

The BD4959G-TR has a 7-pin ultra thin small-outline SOT-25 package, which makes it ideal for space-constrained applications. The operating temperature range of this device is -40 to +125°C, and the input power source voltage range is 4.20V to 20V. It is also compatible with multiple types of power sources, such as 12V and 5V, and has a low quiescent current of 2µA.

The working principle of the BD4959G-TR is straightforward. The device constantly monitors the input supply voltage and switches to an alternate power source if the primary supply voltage drops or gets disconnected. The switch over is accomplished by the power-on reset (POR) and brown-out detection (BOD) functions. The POR function monitors the voltage level on the input power source and trips when the voltage reaches the predefined level. Conversely, the BOD function trips when the input voltage drops below the predefined threshold. Once either of the functions trip, the device switches over to the alternate power source and informs the system that the primary power source has failed and needs to be replaced. In addition to switching over, the device also generates a power-on reset status signal to alert the system that a power failure has occurred and the system needs to be restarted.

The BD4959G-TR is an ideal choice for automotive applications that require power supply reliability and safety. It is an ideal solution for applications such as TVs, radiators, heaters, battery chargers, and LED lighting systems. It is also suitable for applications in battery-powered devices, such as portable computers, cellular phones, and medical equipment. By providing a reliable and safe power supply, the BD4959G-TR helps protect systems against voltage drops and power outages, ensuring their smooth operation and prolonging their useful life.

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