MAX690EPA+

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PMIC - Supervisors are devices that are installed in integrated circuits to protect against various faults, in particular, against excessive current, voltage or temperature. The MAX690EPA+ is an example of such a device, with a wide range of applications and a clear working principle.

The MAX690EPA+ provides supervision functions for DC-DC converters in most portable electronic and communication systems. With an input voltage range of 2.6 V to 5.5 V, it is suitable for use in both single Li-Ion and dual-cell Li-Ion battery-powered systems.

The MAX690EPA+ integrates six open-drain output drivers along with two analog comparators and one glitch filter. This can provide protection against excessive current, voltage or temperature. The device also has a reset output (RESET) that, when activated by any of the other inputs, will indicate a fault and allow the device to be powered down, allowing it to be reset when the fault is cleared.

The working principle of the MAX690EPA+ is based on the three inputs that it accepts, as well as the set reset outputs (RESET). First, it senses the two analog inputs provided by, for example, current and voltage monitoring. The device\'s on-chip comparators, then compare these two inputs with a preset user-programmed threshold, and activate the RESET if either of these inputs exceeds the threshold.

Additionally, it also offers temperature monitoring and protection. The MAX690EPA+ includes an on-chip thermal sensing input (TS) which is connected directly to the over-temperature protection circuit. It monitors the temperature of the device by comparing the voltage applied to the TS pin with an internal voltage reference. A preset over-temperature threshold is used for comparison, and the RESET output is activated if the TC pin voltage crosses the threshold.

The MAX690EPA+ also includes an internal shutdown timer. This timer delays the activation of the RESET output by a user-programmed duration, which is used to help prevent false resets due to glitches or other noise on the device inputs. When the internal timer reaches its preset value, the RESET output is driven low, indicating a fault condition.

The MAX690EPA+ is designed to provide the necessary safety features for low power DC-DC converters in portable electronic and communication systems. Its wide input range, temperature monitoring, and reset delay timer provide the necessary robustness and reliability needed to protect against faulty conditions. Thus, the MAX690EPA+ is an excellent choice for application in a range of systems, providing a high degree of versatility and protection.

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