Series:	BD45xxx
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Voltage Detector
Number of Voltages Monitored:	1
Output:	Open Drain or Open Collector
Reset:	Active Low
Reset Timeout:	180 ms Minimum
Voltage - Threshold:	2.5V
Operating Temperature:	-40°C ~ 105°C (TA)
Mounting Type:	Surface Mount
Package / Case:	SC-74A, SOT-753
Supplier Device Package:	5-SSOP
Base Part Number:	BD45

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Introduction

PMIC (Power Management Integrated Circuit) Supervisors are essential components in circuit design, especially in digital circuits. They are able to monitor crucial parameters in the circuit, such as the state of the power supply, input voltage and voltages applied to the voltage regulators, in order to ensure the circuit remains in safe and stable conditions.The BD45252G-TR is a PMIC Supervisor manufactured by ROHM Semiconductor, capable of optimizing the power supply parameters and providing accurate voltage regulation. This article will look into the application fields and working principle of the BD45252G-TR.

Application Fields

The BD45252G-TR is used in multiple application fields; most notably, the automotive sector. It is a highly reliable Protection IC for on-board devices with twelve protection functions, supporting systems that require accuracy and an operating temperature range of -40 to 125°C.Moreover, the integrated LDO regulator enables dynamic power supply control, eliminating the need for additional external components in the circuit design. The BD45252G-TR provides adjustable monitoring of the auxiliary supply voltage, providing accuract voltage regulation. It can be used to control the voltage in power supplies applying voltage control bits, improving silence operation and frequency adjustment for improved power supply performance.The integrated mechanical fail-safe system ensures safe operation even under severe conditions, making it suitable for automotive applications operating at a wide range of temperatures.

Technical Specifications

The BD45252G-TR provides a wide range of protection functions and monitorings, to ensure safe and reliable operation of the circuit. Details of the product specifications can be seen below: •Operating voltage range of 1.25 to 7.0V•Linear buffer control output•2 level remote ON/OFF function•Adjustable UST monitoring •3 step start up sequence•Stable against voltage drop•Built-in oscillator as main supply monitoring•Over temperature/under voltage protection•12 overvoltage/undervoltage protection functions•Open/short detection•Overvoltage/undervoltage output voltage•Rotating speed detection

Working Principle

To understand the working principle of the PMIC supervisor, it is important to look into the individual elements that compose it.The output voltage controller is a linear buffer output, which accurately regulates the output voltage. This voltage is monitored by the UST (User System Timing) function to ensure the correct parameters.The start up sequence is managed by a three-step system, consisting of a delay start timer and two step start up timers. This is managed by the integrated oscillator that sets the reference and baseline speeds needed for the safe operation of the circuit.The protective functions of the BD45252G-TR include over temperature and under voltage protection, open/short detection and overvoltage/undervoltage output voltage. This ensures that the circuit is protected against fluctuations and other potentially damaging conditions.Furthermore, the mechanical fail-safe system provides the BD45252G-TR with a high degree of protection in the most demanding conditions, eliminating the need for additional devices and allowing for higher efficiency and convenience.

Conclusion

The BD45252G-TR is an effective PMIC Supervisor from ROHM Semiconductor, suitable for automotive applications operating within a wide range of temperatures. It features a linear buffer output, adjustable UST monitoring, _3step start up sequence, over temperature and under voltage protection, open/short detection and overvoltage/undervoltage output voltage.The integrated mechanical fail-safe system has increased the reliability of the device, allowing for improved power supply performance and higher efficiency. With its wide range of protection functions and monitorings, the BD45252G-TR is a highly reliable and dependable component for automotive circuits.

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