DS1236S-5+

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Power Management Integrated circuits (PMICs) are among the vital devices used in modern digital systems and electronics. These devices, otherwise known as Supervisors, help to ensure the efficient and safe functionality of electrical products by controlling power flow. The DS1236S-5+ is a Supervisory circuit with extensive usage in today’s digital products. This article aims to provide an overview of the DS1236S-5+ Supervisory circuit’s application field and working principle.

The DS1236S-5+ offers a simple and cost-effective solution for a flexible range of power management applications for diverse industry sectors. It is commonly used in automotive, industrial, networking, and communications electronics, such as motor controllers, signal generators and conditioners, system-on-chip (SoC) processors and amplifiers, to name a few. This application field is largely thanks to the functions and features of the device, which will be explored further in this article.

Functions & Features

The DS1236S-5+ operates as a Supervisor, controlling the system’s power supply. The device monitors power supply and reset signals of synchronous and asynchronous circuits and supports switching of power-up and power-down operations. The DS1236S-5+ also provides an extended battery back-up voltage for safety. At a typical operating current of 500nA and an operating voltage ranging from 2.7V to 5.5V, the DS1236S-5+ features automatic Delay Reset, Leakage detect, Dual-Voltage detect, and Delay Power-up.

The Delay Reset is the primary feature of the DS1236S-5+ that enhances its performance. This feature effectively eliminates the “glitches” that can occur during reset operations, providing greater reliability and accuracy when it comes to reset timing. In addition, the Leakage Detect feature provides increased accuracy and stability when detecting noise and over-current conditions.

The Dual-Voltage Detect feature provides an additional layer of protection, monitoring a voltage range from 2.7V to 5.5V. If the voltage drops outside of the safe range then the DS1236S-5+ will automatically reset the system to prevent damage and ensure safety. Finally, the Delay Power-up feature helps ensure that all components are adequately powered and stable before the system is switched on.

Working Principle

The DS1236S-5+ operates according to a simple principle of monitoring, comparing, and activating or resetting power flow as applicable. The device sets the operating voltage of digital system, constantly monitors the voltage and current, and compares these readings against predetermined, user-defined parameters. If an over-current or glitch is detected, then the DS1236S-5+ will reset or activate the system’s power flow accordingly in order to protect the system and components.

The DS1236S-5+ controls the system’s power supply using four transistors, a comparator, and a voltage reference. The voltage reference is responsible for setting the target operating voltage, and all monitored signals pass through this reference for comparison. If a malfunction or over-current is detected, then the comparator will activate and reset the system’s power flow accordingly.

The four transistors are then applied to appropriately reset or activate the system’s power flow via the power-on enable (PON), power-down enable (PDN), delay enable (DELAY), and reset enable (RESET) lines. These enable mechanisms are connected to the power supply and will reset or activate the system as needed. The transistors are also linked to an AND gate, which is triggered by the comparator to correctly activate or reset the system as needed.

Conclusion

The DS1236S-5+ is a supervisor designed for a range of digital applications such as motor controllers, signal generators and conditioners, SoC processors and amplifiers. Its features of Delay Reset, Leakage detect, Dual-Voltage detect, and Delay Power-up combine to make it a reliable and safe tool for power management. The device operates according to a simple principle of monitoring, comparing, and activating or resetting power flow according to user-defined parameters. As a result, the DS1236S-5+ is an excellent choice for modern digital products.

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