MAX705CSA-T

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Power management integrated circuits (PMICs) are designed to manage power and provide system reset, watchdog functions and power sequences. Supervisors are an important type of PMIC, and MAX705CSA-T is one example. In this article, we’ll discuss the application field and working principle of the MAX705CSA-T.

The MAX705CSA-T is a precision microprocessor supervisory circuit specifically designed to detect power supply droop and generate a reset when the supply voltage drops below the preset threshold. The device ensures stable operation in the main 3.3V, 5V, and 12V power supply systems for microprocessors, DSPs, and logic circuits. It monitors one of these power supplies, typically VCC, and can be used in battery-backed applications that require reliable startup power or brownout detection.

The MAX705CSA-T provides useful features such as a manual reset input to perform system reset, active-low reset output, internal power-on reset (POR) circuit, programmable reset delay, manual reset control logic, and power fail-related functions. The active-low reset output asserts when the monitored voltage drops below an internally set reset threshold. It deasserts when the monitored voltage rises to a set voltage threshold, usually a value near the reset threshold. The transition of the reset line can be delayed from the monitor voltage level transitions by up to 140ms. This delay allows the internal circuit time to stabilize before the device begins to take action with the reset output.

The MAX705CSA-T has a wide 3.2V to 19V supply range and draws only 1µA of supply current. It is available in 5-pin SOT-23 packages and 8-pin SO packages. The device is normally used in systems with a VCC level of 3V, 3.3V, 5V, 6V, 12V, and 15V.

Its working principle is quite simple. A monitor pin is connected to the power supply, and an internal bandgap voltage reference is connected to a comparator. When the supplied power drops below the reference voltage, a reset signal is generated. The timing of the reset signal is controlled by the reset logic: when the monitor voltage drops below the reset threshold (determined by the device parameters), a reset delay begins and the reset line is pulled low. Once the monitor voltage rises above the reset threshold, the reset line will be pulled low again.

The MAX705CSA-T has many applications in various systems. It can be used in embedded systems where it provides reliable power sequencing and reset functions. The device can also be used in consumer electronics, embedded microcontrollers, and FPGAs. In the automotive industry, it can be used for safe shutdown of engine systems and for protecting against brownouts. It can also be used in medical devices for generating signals for patient monitoring and for monitoring the power supply levels.

In conclusion, the MAX705CSA-T is a precision microprocessor supervisory circuit designed to detect power supply droop and generate a reset when the supply voltage drops below a preset threshold. It is available in 5-pin SOT-23 packages and 8-pin SO packages and comes with a wide supply range of 3.2V to 19V. Its working principle is based on a monitor pin that is connected to the power supply, and an internal bandgap voltage reference connected to a comparator.

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