LP3470IM5X-2.93

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The LP3470IM5X-2.93 is a member of the LP3470 family of ultra-low power PMIC (Power Management Integrated Circuit) supervisors, designed to provide reset and power-on sequencing functions in today\'s power-sensitive designs. The LP3470IM5X-2.93 is specifically designed to reduce power consumption, improving the performance and extend the battery lifetime of portable and mobile products.

Application Field

The LP3470IM5X-2.93 is suitable for a broad range of applications, including low-power handheld computers, portable and mobile communication devices, PDAs, digital still cameras, and gaming systems. With its enhanced features and rugged package, the LP3470IM5X-2.93 can be used for battery-powered, low-voltage applications, providing the automotive industry with an efficient reset solution.

Working Principle

The LP3470IM5X-2.93 is designed to generate an active-low RESET signal for power-on reset (POR), power-fail reset (PFR), or brown-out reset (BOR) events. It can reset the system if any of the following three conditions occur: (1) The voltage at either VCC1 or VCC2 falls below the brown-out voltage level; (2) The VCC2 voltage is below the power-fail/undervoltage lockout (UVLO) threshold; or (3) An overtemperature warning signal is received. It also includes an input called RESB (Reset Band) which is active when both the VCC1 and VCC2 voltages are above the Brown Out level. The RESB signal will reset the system if the voltage at VCC1 and VCC2 is below UVLO for a period of time.

The LP3470IM5X-2.93 has a Comprehensive Power-On Sequencing (CPOS) feature which allows users to program the order in which various voltage rails rise. This allows for more efficient power distribution, easing board layout and reducing power losses. The LP3470IM5X-2.93 can control up to 8 independent voltage rails. Any of the rails can be configured to have a programmable voltage rise time, allowing for power conservation and preventing glitches on the rising rails.

The LP3470IM5X-2.93 also provides Manufacturability, Assembly, Component Placement, and Testability (MACPT) features. This allows the user to program an active-low output signal to be asserted after the power-on sequence is complete. This output signal can then be used to drive a relay or a transistor, to control flow of current on the power rails, or to signal the completion of the power-on sequence.

Finally, the LP3470IM5X-2.93 also has thermal undershoot protection, so that the device will not reset even if the temperature of the device falls below the threshold. This feature prevents excessive power cycling during normal operating conditions. Additionally, the LP3470IM5X-2.93 has an integrated voltage monitor with adjustable voltage thresholds, allowing for monitoring of various rails.

Slew rate control and timing accuracy are also very important features, as these enable the LP3470IM5X-2.93 to meet the requirements of low-power and high-density applications. The device features 0.5-ns accuracy and 4-ns slew rate control, making it suitable for applications that require very reliable power sequencing, such as those in automotive and industrial systems.

The LP3470IM5X-2.93 offers flexibility, low cost, and low power consumption all in a single integrated device, making it ideal for use in power-sensitive applications. With its comprehensive and easy to use features, the LP3470IM5X-2.93 serves as a reliable and cost-effective solution for reset and power-on sequencing.

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