DS1834AU+

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PMIC (Power Management ICs) are essential for the efficient use, delivery, and storage of electrical energy. Different types of PMICs are used to handle different scenarios; one application area that they are used in is Supervisors. Supervisors handle fault and overload protection, sequencing and sequencing control, system reset and power-on reset, and level detection and logic functions. One type of supervisor IC is the DS1834AU+ Supervisory Circuit. This IC is an ultra-low power CMOS supervisor employing a precision voltage detector and reset function, and is suitable for use in personal computer products, desktop, portable and laptop systems, instrumentation, communications systems and embedded microcomputer applications.

The DS1834AU+ package measures 3.0 mm x 3.0 mm, making it relatively small and low power for a supervisor IC. Its DC specifications include an operating voltage range of 2.5V to 5.5V and a low ICC current of 350 nA. The DS1834AU+ features both delayed and simultaneous power-on reset (POR) signaling and is guaranteed to provide a fixed tRPOR minimum of 100 ms and a fixed tSD minimum of 135 ms.

The on-chip precision voltage detector is designed to respond to an adjustable threshold within a nominal range of 1.05V to 5.0V with better than 1% accuracy. This voltage detector returns to its quiescent state within 60 voltage-monitoring cycles once the VDD supply has stabilized. The output reset is driven low until VDD has exceeded VTH, and then its re-initialized to a high state. The reset remains active while the detect voltage is above the programmed reset threshold, with a guaranteed reset active (VOUT = ‘0’V) warning time of tWARN minimum = 10 ms.

The DS1834AU+ is designed to work automatically in response to programmable conditions and reset levels, with an open-drain, active-low reset output. This active-low output provides power-on reset (POR) propagation delays in the form of a reset S-R (Set-Reset) latch. This is users can advise initial states of the system and control their reset sequence. Furthermore, the reset output is asserted low under low-voltage conditions and can be enabled and disabled.

The DS1834AU+ is designed for applications where minimum system power consumption and high reliability are desired, such as PC power-on sequencing, system health monitoring and over-temperature shutdown. Some of the common applications of the DS1834AU+ include temperature monitoring and fan/heat-sink control in notebook PCs and having watchdog protection against lockouts due to software stalls. One benefit of using this ICs is that its low-power consumption allows it to be used in no-load and battery operation conditions. Its POR circuit is qualified to keep system voltages stable during power-on and power-off sequences for up to 8.0 mS.

In conclusion, the DS1834AU+ is an ideal supervisor IC for applications requiring low power consumption and high reliability. It offers a wide range of features including adjustable reset voltage, adjustable reset propagation delays, POR propagation delays, and reset S-R latch. Moreover, its low ICC current, small package size and fixed delay times ensure that it is reliable, tamper-proof and economical.

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