MAX16047ACB+T

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Modern designs increasingly design in power management integrated circuits (PMICs) to regulate and monitor power in order to extend battery life, shield circuitry from electrical transients, and simplify board layout. Adding such components often simplifies designs greatly, by allowing designers to eliminate multiple protection and regulation circuits, further saving time and space. PMICs provide an array of power management functions, such as supervisor circuits, power MOSFETs, and other components that can provide functions such as under voltage protection, power sequencing, voltage regulators, and monitoring.

This article examines the MAX16047ACB+T, a power supervisor and overvoltage protection IC from Maxim Integrated. We will look at its application field, internal structure and working principle.

Application Field

The MAX16037ACB+T is a System PMIC that provides single-supply voltage supervision, power-good status, a VIN power FET, and overvoltage protection. Its ultra-low operating and standby current makes it ideal for battery-operated systems and energy-harvesting applications. This System PMIC features integrated features, designed to provide energy savings by reducing the number of external components required in a design. It also features a 140 mV (max) hysteresis threshold window to accurately detect power failures, avoiding false power-good signals due to noise.

This System PMIC is a single-chip solution that is widely used in industrial, consumer and computer applications. The supervisors in the MAX16037ACB+T offer a wide range of operating voltage from 3.1V to 22V. Additionally, its fast response time upon a power failure makes it suitable for applications demanding very fast detection of undervoltage conditions.

Internal Structure

The MAX16037ACB+T is a single IC integrated circuit divided into 4 main sub-sections: Voltage Suprevisor, Power FET, Overvoltage Protection, and Sequencing Control.

The Voltage Supervisor contains circuitry that monitors the supply voltage and an internal voltage reference. This section also has integrated hysteresis that helps prevent false power-good signals due to noise.

The Power FET section is a single low-RDS_ON N-channel power MOSFET that supports a wide range of VIN operating voltages. The Power FET can be used to power the system, or to provide a reset output when necessary.

The Overvoltage Protection section provides protection against overvoltages and transients on the input supply and load current sense. With a 150mV threshold, the OVP circuit reduces the risk of overvoltage damage to the system.

Finally, the Sequencing Control section provides an adjustable output sequencer that provides programmable delays and pulse widths. This section also includes a manual reset input and a status output.

Working Principle

The MAX16037ACB+T is an integrated circuit designed to provide tight, accurate power supervision with the fewest external components for space-constrained designs. In the presence of a valid input voltage, the train (bias) voltage and the supervisor output will be active (low) and the voltage comparator output is disabled. When the input voltage falls below the factory-trimmed lower threshold, the output will go low, initiating a reset and/or powerdown if a single-channel supervisor is used.

The MAX16037ACB+T also includes an integrated power MOSFET to provide power control. When the battery voltage is within the supervisor operating range, the MOSFET is enabled, thus allowing the input voltage to be controlled. When the input voltage falls below the voltage supervisor threshold, the power MOSFET is turned off and the battery will be disconnected from the system.

Included in the MAX16037ACB+T is an overvoltage protection (OVP) circuit that can detect high-frequency transients. This circuit is designed to limit and protect the power supply and load currents against excessive transients at the input or load and offers a constant threshold accuracy over the entire operating temperature range. A built-in sequencer provides adjustable delays, pulse widths, and a manual reset input. Finally, the MAX16037ACB+T also provides a status output that can be used for system monitoring and control.

The MAX16037ACB+T System PMIC is the ideal solution for many types of battery-operated and energy harvesting systems. Its integrated features and low power consumption make it suitable for applications where tight power supervision and efficient power management are required.

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