MAX6338JUB+

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Power Management Integrated Circuit (PMIC) supervisors are essential components used to monitor a variety of systems and perform functions such as power reset, voltage monitoring, and temperature thresholding. The MAX6338JUB+ is a precision, low-power reset supervisor specifically designed for accurate power-up and power-down sequencing in handheld and laptop computing, as well as for other highly integrated systems.

Overview of the MAX6338JUB+

The MAX6338JUB+ is a high performance microprocessor supervised reset (MSR) IC with tamper-proof power sequencing and low standby current. It is designed with a wide range of adjustable reset thresholds, delay and active-low manual reset inputs. The MAX6338JUB+ also features a tamper-proof mode to ensure the reset remains active even without an external reset input.

The MAX6338JUB+ is housed in an 8-pin TDFN package, with an operating temperature range of -40°C to +125°C. It is available in an adjustable-threshold reset cycle delay of up to 250 ms, with an adjustable manual reset (MR) threshold of 1.5 V. It features active-low, manual reset input and a pull-up network on the reset (RST) output.

Application Fields

The MAX6338JUB+ is designed to monitor the power supply in handheld and laptop computing applications. It provides a precision reset-under-voltage (RUV) detection for reliable system startup and for improved power-down sequencing that ensures that all power-consuming ICs receive valid voltage levels when system power is removed. This reset supervisor is ideal for a variety of applications, including but not limited to: medical equipment, industrial and consumer control systems, mobile phones, digital media players, multi-processor systems, and portable applications.

Working Principle

The MAX6338JUB+ utilizes a non-reference AC/DC monitor circuit to detect when the voltage of its power supply falls below its factory-programmed reset threshold. This voltage is compared against a precise internal reference voltage and the threshold is adjusted by an external resistor. Once the reset threshold is reached, the reset output (RST) will transition from high to low to initiate the power-on reset sequence.

After the reset, the MAX6338JUB+ continues to monitor the power supply voltage and if the voltage level drops below the threshold value for a specified period of time, the reset output (RST) will transition from low to high to initiate the power-down reset sequence. The reset delay feature in the MAX6338JUB+ allows the reset sequence to remain inactive until the power supply has stabilized at the correct reset level. Once the reset delay expires, the reset output (RST) will transition from low to high to initiate the power-down reset sequence.

Additionally, the MAX6338JUB+ provides an active-low manual reset input (MR) that can be used to manually reset the device. This can be used as a last resort to manually restart the system if the power supply fails to reset autonomously.

Conclusion

The MAX6338JUB+ is a high-performance, low-power reset supervisor designed for use in handheld and laptop computing applications. It is designed to provide a precision reset-under-voltage (RUV) detection for reliable system startup, as well as improved power-down sequencing that ensures all power-consuming ICs receive valid voltage levels when system power is removed. The device provides a tamper-proof mode, adjustable reset thresholds, adjustable delay, and active-low manual reset input features.

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