LTC2907CDDB#TRMPBF

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Multi-Voltage Supervisor
Number of Voltages Monitored:	2
Output:	Open Drain or Open Collector
Reset:	Active Low
Reset Timeout:	140 ms Minimum
Voltage - Threshold:	2.5V, 3.3V, 5V, 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:	LTC2907

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Introduction

The LTC2907CDDB#TRMPBF (Linear Technology Corporation) is a part of the PMIC – Supervisors family of products. It is a two-channel system voltage monitor which can be used to detect over-voltage and under-voltage(UVLO) conditions on power supplies. The power-on reset (POR) circuit is designed to simultaneously monitor two supplies using two externally adjustable thresholds, providing integration flexibility of the voltage sensing comparator to the system design.

Application Field

The LTC2907CDDB#TRMPBF is mainly used to monitor and control system voltages. It provides fast response time and hysteresis on both supply thresholds to protect against false triggering due to noise. It can be used in a range of applications in areas such as automotive, communications, consumer, industrial, and medical.In automotive applications, the LTC2907CDDB#TRMPBF can be used to monitor battery and system voltages, and to enable additional functions such as controlling the switch-mode power supply, powering the ECU, controlling the electromagnetic interference (EMI) filter, and providing system shutdown sequencing.In communications, it can be used for monitoring the system voltage for Ethernet networks, data centers and server applications. It can also be used for monitoring the supply voltage of voltage regulators.In consumer applications, the LTC2907CDDB#TRMPBF can be used to monitor consumer electronic devices, such as televisions, sound systems and game consoles, as well as computer peripherals.In industrial applications, it can be used in automated device control and industrial sensing systems. In medical applications, it can be used to monitor vital signs and to enable medical equipment to operate safely.

Working Principle

The two externally adjustable thresholds of the LTC2907CDDB#TRMPBF transistor-transistor logic (TTL) compatible monitoring pins indicate whether the two system voltages are high or low relative to each other. When either voltage exceeds its respective threshold the output of the monitoring pin is pulled high and power-on reset (POR) circuit is triggered.The POR circuit reduces the system power so that it can detect any unduly high or low voltage conditions as they occur. If either of the two monitored voltages is lower than the TTL compatible reset threshold of the other supply, an additional reset signal is provided to the system.The TTL compatible open-drain reset pin can be connected to an external reset source. In most designs, the TTL compatible open-drain reset pin is connected to the microcontroller or micro-controller-based system, so that all reset signals are centered around a common microcontroller.The LTC2907CDDB#TRMPBF can also be used in conjunction with a microprocessor or micro-controller-based system to provide system-level safety monitoring. For example, it can be used to detect under-voltage or over-voltage conditions and provide warning messages or to initiate system power-down.

Conclusion

The LTC2907CDDB#TRMPBF is a two-channel system voltage monitor designed for use in a range of applications from automotive to consumer electronics. It provides fast response time and hysteresis on both supply thresholds to protect against false triggering due to noise. Its external adjustable thresholds and TTL compatible reset pin make it possible to connect to a microcontroller or micro-controller-based system to provide system-level safety monitoring.

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