NCP305LSQ18T1

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PMIC - Supervisors is one of the important sub-branches of power management, and NCP305LSQ18T1 is one of its top-notch products. This article will explain the application field and working principle of NCP305LSQ18T1.

NCP305LSQ18T1 is an ultra-low quiescent current power supervisor IC, belonging to the family of innovative solutions. It has been designed to specifically provide a low quiescent current power supervisor and reset solution which also features a Power Good output in a space-saving industry-standard 5-pin SOT23-5 package.

As far as the application field is concerned, the NCP305LSQ18T1 is well suited for consumer applications requiring advanced power control solutions. It is ideal for mobile systems, such as the smartphones, media players, LCD TVs, feature phones and Point-of-Sale systems. The NCP305LSQ18T1 is suitable for applications with multiple power supplies and it offers a configurable watchdog timer for fault detection as well as reset assertion.

Coming to its working principle, the NCP305LSQ18T1 has an internal voltage reference and circuitry designed to detect an initial power supply voltage of 1.5V and monitor it to ensure it holds the supply voltage at 1.50V. All voltage monitoring and excess voltage protection happens internally, and it is not necessary to externally select the voltage to be monitored. The NCP305LSQ18T1 will remain enabled and will actively monitor V supply until V supply decreases to 0.90V.

In case the supply voltage (Vcc) becomes less than 0.90V, and Vcc continues to stay low for more than 1.27 ms; the NCP305LSQ18T1 will assert its reset output to indicate a fault. In addition, following a Power-On Reset (POR), NCP305LSQ18T1 will also generate a Power Good (PG) signal during normal operation, which will enable the transition indication from power down to power up event.

Compared to traditional supervisor solutions, the NCP305LSQ18T1 offers very low power consumption, eliminating the need for an external bias voltage and offering a total supply current draw of 50uA. In some cases, this ultra-low quiescent current can provide a total system power savings of up to 40%.

Overall, the NCP305LSQ18T1 is an advanced, low quiescent current, power supervisor and reset solution. With its wide range of features, it is an ideal solution for power control in mobile systems such as those mentioned above.

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