BD48K44G-TL Integrated Circuits (ICs)

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PMIC Supervisors are used to monitor supply voltages and ensure they are below a predetermined threshold. The BD48K44G-TL is a supervisor produced by NXP Semiconductors. It is designed to provide voltage detection, reset and alarm functions for system safety and power management applications. The device features a low-threshold voltage detect (1.5V) with a 0.725V hysteresis and low-voltage enable that allows the user to select a threshold voltage between 1.5V and 4V with a 0.3V resolution. This supervisor also provides an adjustable reset time delay and an automatic reset capability.

Overview

The BD48K44G-TL supervisor provides one fixed reset at low-threshold voltage detect, one adjustable resetSource at selectable threshold voltages and an adjustable reset timeout. The device has an active low open-drain reset output that can source up to 4mA. An external resistor connected to the VTH input pin is used to select the threshold voltage. The device also includes an active low alarm output with an open-drain output capable of sourcing up to 4mA and an active low ST output with an open-drain output capabable of sinking up to 4mA. Low-voltage detection is enabled by default when the power supply is connected, and remains active as long as the power supply is powered. The device has an active low power-good output and an active low power-bad output. The power-good output will become active when the voltage is above the VTH pin and the power-bad output is active when the voltage is below the VTH pin. The device maintains both outputs active until the reset timeout is complete.

Features

• Fixed detection at 1.5V with 0.725V hysteresis
• Adjustable detection between 1.5V and 4V with 0.3V resolution
• Selectable timeout from 1ms to 7s with 5ns resolution
• Automatic reset enabled
• Active low open-drain reset output capability of up to 4mA
• Active low alarm output capability of up to 4mA
• Active low ST output capability of up to 4mA
• Power-good and -bad output

Applications

The BD48K44G-TL is used in a range of system safety, power management and voltage detection applications. Examples include power-supply monitoring in router and switch applications, voltage detection and reset of distributed systems, and system level reset in server and embedded applications. The device can also be used to detect incorrect card insertion in terminals, printer, copier, and fax machines.

Working Principle

The BD48K44G-TL supervisor operates by monitoring the voltage level at the VIN pin. When the voltage drops below the low threshold voltage (1.5V), the low voltage detect, reset and alarm are activated. The reset output will go low, the alarm output will go low, and the ST output will be enabled. The reset output remains low for the timeout period, which is set by the external resistor connected to the VTH pin. When the voltage level rises above the threshold voltage, the reset output will go back high and the alarm output will remain low. The reset is cycled again at the end of the next timeout period.

Conclusion

The BD48K44G-TL supervisor by NXP Semiconductors is designed to provide voltage detect, reset, and alarm functions for power management applications. It features a low threshold detect with a 0.725V hysteresis, adjustable threshold voltage with a 0.3V resolution, adjustable reset time delay, and an automatic reset capability. The device provides applications such as power supply monitoring, voltage detection and reset of distributed systems, and system level reset in server and embedded applications.

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