Supervision IC targets and eliminates high power noise in low voltage circuits


Experienced engineers know that transient situations can be the most difficult, frustrating, and erratic of events. This may involve restarting a data link after a link loss, or simply setting up the power rails of a system where the supervisory-based reset decision must be “right” and not be. issued prematurely.

Conventional power supervision ICs often have difficulty controlling their reset output state when the input voltage rail (VCC) has a very low nominal value, an increasingly common design scenario. This can lead to inconsistent circuit “boot” performance and prolonged debugging sessions.

Such a situation is handled by the MAX16161 and MAX16162, a similar pair of single channel, ultra-low current power rail supervisors from Maxim Integrated Products. (see figure). These noise-free devices monitor the supply voltage and initiate a reset when that input voltage falls below the reset threshold. Once the monitored voltage exceeds the factory-set threshold voltage, the reset output will remain on for the reset delay period and then turn off. As a result, the processor using this rail can finally exit its reset state and begin normal operation.

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This action contrasts with the characteristics of conventional supervisors, which are unable to reliably control the output state of the reset line when VCC is very weak. The reset output of the MAX16161 / MAX16162 is guaranteed to stay on until a valid VCC is reached. This is especially important to prevent low voltage cores from leaving their reset state when powered on or off. It also improves performance when using the MAX16161 / MAX16162 as base power sequencers, as the devices will not cause a transient activation of a downstream power supply due to output issues.

The differences between the MAX16161 and the MAX16162 are small but notable. The MAX16161 has a Manual Reset Debounce (MR) input that asserts a reset when it receives an appropriate input signal, which can be active-low or active-high (depending on the option selected by the user) and has threshold voltage options from 1.7 to 4.85 V. The MAX16162 does not have such an MR input; instead, it keeps V separateCC and VIN pins, supporting threshold voltages from 4.85V to 0.6V.

Typical quiescent current is only 825 nA for these integrated circuits, which are priced at $ 1.19 (1000 pieces). They are specified on the Temperature range from 40 to + 125 ° C and are housed in 1.06- × 0.73mm 4-pin WLP and 4-pin SOT23 packages. The comprehensive 20-page datasheet provides critical maximum / minimum specifications in tabular and graphical form, and EE-Sim models are available to support their design simulation.

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