MAX708EPA+

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Power management ICs (PMICs) are commonly used to manage power in various electrical and electronic products. They are used to provide voltage and current regulation and are used in a wide range of applications such as automotive, consumer electronics, industrial and medical applications. PMICs come in many different form factors, from integrated modules to surface mounted components, and are used to control, monitor and regulate the power within a system. PMICs are typically divided into two different categories, regulators and supervisors.

Regulators provide the primary means of controlling and monitoring the voltage and current in a system, while supervisors are used to detect, and in some cases, prevent faults and power anomalies in a system. The MAX708EPA+ is a supervisor PMIC from Maxim Integrated and is used for reset and power-on reset (POR) functions in low voltage applications.

Application Field

The MAX708EPA+ is specifically designed for use in low voltage applications, such as micro-controllers and other systems operating on 3.3V and 5V supplies, and it operates over a wide temperature range of -40 °C to +125 °C. It is a highly reliable, easy to use reset solution that is ideal for reset functions in low voltage applications such as USB peripherals, consumer electronics, hand-held and medical devices, as well as industrial applications.

Working Principle

The MAX708EPA+ is an active-low open-drain reset controller that monitors an input voltage and generates a reset signal when the voltage falls below an adjustable threshold. The reset signal is an active-low, open-drain output that remains active until the reset conditions are cleared. The reset can be cleared by two independent methods. The first is through a manual reset, which is triggered by a pushbutton or other external logic signal. The second is an automatic reset, which is triggered by an internal timer. The timer period is adjustable with an external capacitor.

In addition to the reset output, the MAX708EPA+ also features an active-high power-on reset (POR) output, which is activated when the input voltage rises above the adjusted VCC threshold. This output is used to sequentially power on the system peripherals, such as memory, bus controllers, and other system components, and to ensure orderly system startup. The MAX708EPA+ is also equipped with an active-high watchdog output, which is triggered when the timer period is exceeded or the external reset conditions are not cleared before the timer period expires.

The MAX708EPA+ is a highly reliable reset solution that offers excellent EMI immunity, power transient protection, and low power operation. It features a low standby current of 300 nA, and its input voltage range spans 0.9 V to 7.0 V. The MAX708EPA+ is a RoHS compliant device and is available in a 16-pin TSSOP package.

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