BD46331G-TR

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With the development of technology and mechanization, the application of PMIC - Supervisors, such as BD46331G-TR, is becoming more and more extensive. This article mainly introduces its application field and working principle.

As an industrial grade, low voltage supervising IC, BD46331G-TR is widely used in industrial, commercial and portable applications that require reset generation, power-good monitoring, and push-pull/open-drain output configurations. Other applications such as over temperature protection and under voltage detection, VoW (Voltage-On-Wakeup) are also available.

In particular, the device provides a flexible reset method which is important for board level use. Specifically, through the desired combination of power-good signals and the watchdog counter, a reset can be generated with a wide range of programmability. Additionally, the extended temperature range of -40 to +125°C makes it suitable for various industrial demands.

The main features of BD46381G-TR are listed below:

• -40°C to +125°C Operation Temperature
• Supply Voltage from 2.2V to 10V
• Input Supply Voltage Range: 0.65V to 5.50V
• Latch Method Reset Output
• Programmable Reset Period from 250mS to 2.2S
• Hard and Soft Reset Inputs
• Watchdog Counter (WDC)
• Power-Good (PGD) Output Dual Configuration:
  • Push-Pull Outputs
  • Open Drain Outputs
• Voltage-On-Wakeup (VoW) Input
• N-Level Reset Outputs

The wide range of features, as well as the high accuracy and wide temperature range, make the device particularly suitable for industrial, commercial and portable applications such as industrial control, automotive and server applications.

From the working principle perspective, the device provides a flexible reset method, which is important for board level use. For example, through the desired combination of power-good signals and the watchdog counter, a reset can be generated with a wide range of programmability. Additionally, the extended temperature range of -40 to +125°C makes it suitable for various industrial demands.

BD46381G-TR consists of four basic blocks: power-good comparator, voltage-on-wakeup (VoW) comparator, watchdog counter and reset logic. The device uses the input supply voltage (VIN) to monitor the power-good signal (VIN/PG) and generate a power good output (PGD). The device further monitors the VoW signal (Vin/VOW) to detect the voltage drops outside the normal operation range and to generate a reset signal (RST).

The watchdog counter (WDC) is used to execute a reset in case of a system failure.When enabled, the WDC continously Times a selectable period of 250ms, 500ms, 1s, 2s. The expiry of the WDC time window is indicated by an internal signal, WDO, which is used by the reset logic to generate the reset event.

The reset logic generates a configurable active low or active high reset signal based on the power-good signal (PGD), the WDO signal and the hard reset (RSTB) signal. The RST signal is available in open-drain or push-pull configuration as well as in a N-level configuration for multiple reset outputs.

In summary, BD46381G-TR is an industrial grade, low voltage supervising IC which is widely used in the industrial, commercial and portable applications that require reset generation, power-good monitoring, and push-pull/open-drain output configurations. It provides a wide range of features such as -40 to +125°C operating temperature, power-good comparator, voltage-on-wakeup comparator and watchdog counter, which makes it a suitable device for various applications. With its flexibility, accuracy and wide temperature range, BD46381G-TR is a great choice for different types of applications.

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