LM3705XDMM-463/NOPB

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Power management integrated circuits (PMIC) enable the efficient operation and management of systems by converting and optimizing power demands of their designated load and provide custom solutions tailored to specific electronic components. PMICs are therefore crucial in ensuring efficient and reliable performance in many devices like computers, smartphones, tablets, and other everyday electronics. Of all the different types of PMIC, supervisors are an important group of circuits designed to detect and manage power on-off conditions, reset signals, and data integrity. One of the more popular supervisors is the LM3705XDMM-463/NOPB.

LM3705XDMM-463/NOPB Overview

The LM3705XDMM-463/NOPB is a 3 V to 5 V supervisor with an integrated pre-bias voltage detection and sequencing circuit. This supervisor is a stand-alone device and works in circuit protection, reset generation, and power sequencing applications. It includes an internal 0.7V input, a comparator and a 5000μA type output to detect, control and monitor the system’s power supply and to ensure data integrity.

This device consists of a power-on-reset (POR) circuit that provides an active low reset signal upon power up, a high-threshold comparator circuit that reacts to input voltages greater than 4.635 V, and a temperature-compensated voltage regulator for monitoring voltage rail(s). It also features an open-drain output that produces an active low output signal under power fault conditions and can sink up to 5 mA current.

LM3705XDMM-463/NOPB Application Field and Working Principle

Application Field

The LM3705XDMM-463/NOPB is designed for applications such as industrial process control, medical devices, power supply sequencing, power management data protection, and system reset generation. It is suitable for microcontrollers, memories, and processor-based systems, and can also be used in existing board designs.

Working Principle

The working principle of the LM3705XDMM-463/NOPB is based on a variable power-on reset and adjustable pre-bias comparator circuit. The reset signal is generated when the reset threshold voltage is reached, and the pre-bias comparator circuit monitors the input voltage level and will provide an active low output signal when the input voltage is greater than 4.635V.

The LM3705XDMM-463/NOPB contains two resistors – R3 and R4 – and a capacitor - C1 – to allow for accurate and stable power-on reset threshold and pre-bias voltages. The voltage set across the R4 resistor will be monitored, and when it reaches the reset threshold voltage, an active low reset signal is produced on the output.

The pre-bias comparator circuit will monitor the voltage set at the upstream of capacitor C1 and compare it to the voltage set across R3 resistor. When the pre-bias voltage is greater than 4.635V, a low-level signal will be output. This signal is then used to indicate to a microcontroller or processor that the voltage rails need to be sequenced.

Conclusion

The LM3705XDMM-463/NOPB is a convenient and reliable power management integrated circuit (PMIC) that is designed to monitor the system power supply, protect data integrity and generate the reset signal on power up. It is ideal for applications such as industrial process control, medical devices, power supply sequencing, power management data protection and system reset generation. It can be used in existing board designs and is suitable for microcontrollers, memories, and processor-based systems.

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