LTC2909CDDB-2.5#TRPBF

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Multi-Voltage Supervisor
Number of Voltages Monitored:	3
Output:	Open Drain or Open Collector
Reset:	Active Low
Reset Timeout:	Adjustable/Selectable
Voltage - Threshold:	2.213V, Adj, Adj
Operating Temperature:	0°C ~ 70°C (TA)
Mounting Type:	Surface Mount
Package / Case:	8-WFDFN Exposed Pad
Supplier Device Package:	8-DFN (3x2)
Base Part Number:	LTC2909

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Introduction
The LTC2909CDDB-2.5#TRPBF (hereinafter referred to as LTC2909) is a low-power microprocessor supervisor and reset IC from Linear Technology. It belongs to the PMIC (Power Management ICs) category and falls under the Supervisors subcategory. The IC is an advanced voltage/current monitor and provides a wide range of accurate diagnostics as well as all necessary supervisory functions, including undervoltage and overvoltage protection, reverse voltage protection, current-limit detection, fault monitoring, and manual reset. This article provides a brief overview of LTC2909’s application field and its working principle.

Application Field
The LTC2909 is a suitable choice for a wide range of applications such as digital audio/video systems, meters, gaming systems, medical instruments, automotive/transportation systems, data converters, batteries, and industrial/consumer embedded systems. The IC is also suitable for embedded applications where analog supervisor functions are needed. It features an on-chip programmable timer, a manual reset input and an output buffer, which make it easy to use in the specified applications.

Operating principle
The LTC2909 is a complex microprocessor supervisory chip with multiple input channels. It can be used as an analog voltage and current monitor as well as a digital supervisor. The chip has three main components: the main stage, the reset stage, and the output control logic. The main stage consists of two comparators that monitor the VIN and MAXVIN inputs for undervoltage and overvoltage, respectively. The reset stage consists of a charge pump, a voltage reference and a comparator. The comparator compares the input voltage to the reference voltage. If the voltage is greater than the reference voltage, it triggers an incredibly fast (typically 500ns) active-low reset signal. The output control logic accepts input from the reset stage and provides an output signal to the system via a buffer. This output signal can be used to reset the main processor, stop the system from running, disable devices and so on.

Fault Monitoring
The LTC2909 provides a comprehensive fault monitoring feature, which helps to ensure a reliable system. The fault monitoring mechanism monitors the inputs for five types of faults: intermittent undervoltage, undervoltage, overvoltage, reverse voltage, and current-limit detection. The fault monitoring can be individually enabled and disabled, and the fault detect threshold can be set individually. If the fault is detected, an active-high fault output is generated. This output can be used to set a microcontroller flag or trigger any other appropriate action.

Manual Reset
In case of emergency or system lockup, the LTC2909 provides a manual reset feature. This feature has a dedicated input pin, which can be used to externally trigger a system reset. It is useful in cases when the power-on reset signal is blocked or interrupted. The manual reset pin can also be used to reset/restart the system after a firmware upgrade or when troubleshooting a software issue.

Conclusion
The LTC2909 is an advanced voltage/current monitor and provides a wide range of accurate diagnostics as well as all necessary supervisory functions. It is a suitable choice for digital audio/video systems, meters, gaming systems, medical instruments, automotive/transportation systems, data converters, batteries, and industrial/consumer embedded systems. The chip also has a comprehensive fault monitoring feature, as well as a manual reset feature, that makes it a reliable and versatile chip for embedded applications.

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