MAX6734KAYDD3+

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The MAX6734KAYDD3+ is a direct-to-battery low-voltage supervisor IC, intended for low-voltage power supply or battery backup applications. It is part of the Power Management Integrated Circuit (PMIC) - Supervisors category of devices that help ensure the reliable and efficient operation of electronic equipment. This document provides an overview of the MAX6734KAYDD3+ application field and its working principle.

Application Fields

These supervisors provide voltage supervision, monitor battery voltage to determine if input power is present, and regulate acceptable output voltages by controlling multiple outputs.The MAX6734KAYDD3+ is suitable for applications that require addressing the challenges of cell phone battery voltage monitoring and switching. It is designed for use in low-voltage power supplies, such as mobile phone battery backup, notebook computers, and personal digital assistant (PDA) applications. It offers a low loss, high-efficiency solution for voltage monitoring and switching and can be configured with many features to simplify board design and reduce system cost.

Features

This IC integrates three featured functions to monitor, compare, and control voltage levels. These functions include:

• Precision Voltage Monitoring: Monitors three supplies and triggers a delay timer whenever one of them falls below a preset threshold.
• Delay Timer: This timer triggers a specified delay time upon detection of a low voltage condition.
• Voltage Switching: Monitors two other supplies and switches an output voltage between two preset levels, depending on their relative voltage levels.

Package Type

The MAX6734KAYDD3+ is available in a micro TDFN-3 package (3 mm x 3 mm) and is rated for operation from -40°C to +85°C. The device supports an input voltage range of 0.9V to 5.5V, and the output voltage switch can be set between 0.625V and 3.1V.

Power Operation

The MAX6734KAYDD3+ utilizes a direct-to-battery feature, allowing the battery voltage to be monitored and switched with no additional external components. This setup provides low power consumption and excellent transient immunity. The device includes an adjustable UVLO monitor that allows the user to program the device to start up (or turn off) by itself when a certain threshold is met. The device also includes a novel power down mode, which will automatically enter into a low current consumption state when the input supply voltage exceeds the set voltage level for more than 1.6 ms.

Working Principle

The MAX6734KAYDD3+ combines these features into a single-chip solution to provide a robust battery voltage monitoring and voltage switching solution. The device continuously monitors the selected battery voltage and will switch the voltage to an auxiliary output if the battery voltage drops below a programmed threshold. The device will also shut down when an overvoltage condition is detected. The voltage switching is programmable, and can be enabled or disabled through command pins.

The MAX6734KAYDD3+ also includes a precision voltage monitor for monitoring two other supply voltages. If any voltage drops below the programmed threshold, a delay timer is triggered. The delay timer allows the voltage to stabilize before the voltage switch is activated. This feature helps minimize false switch activations due to transient signals.

Conclusion

The MAX6734KAYDD3+ is a cost-effective, integrated solution for applications requiring reliable battery overvoltage and undervoltage protection with adjustable delay timing. It provides an efficient, low power, high accuracy way to monitor and switch an auxiliary voltage in low voltage power supplies and battery backup applications. The integrated features enable the device to be used in a variety of applications and make it a perfect solution for embedded systems that require reliable voltage monitoring and switching.

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