TLC7703QPW

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Electronic devices are becoming increasingly advanced and small, making it necessary for a power management integrated circuit (PMIC) to be able to handle the complexity of the modern environment. The TLC7703QPW, or QuadReg-LB, voltage supervisor from Texas Instruments is designed to do just that, providing a reliable solution for monitoring voltage levels across multiple channels or portions of circuits. This particular device falls into the category of PMIC Supervisors, and is useful for applications requiring multiple supply rails, such as field-programmable gate arrays (FPGAs) and memory devices.

The TLC7703QPW is an ideal option for applications needing a low-voltage supervisor because it has four separate channels, each capable of being set to a different trip voltage, and just a single on-chip output providing a logical 1 or 0 when any of the voltages exceed the trip levels. It operates with the same circuit on all four channels, and is capable of monitoring voltages ranging from 2.9V up to 5.5V. While most of the voltages used in modern electronics are greater than 5.5V, this device can function as a warning mechanism to alert the user when the voltage is about to dip below the acceptable safe level.

One of the most useful features of the TLC7703QPW is the Power-On Reset (POR) delay. This delay allows the device to wait for the voltage levels to settle and become stable before resetting. This prevents false resetting which could lead to unwanted system malfunctions or system losses. The Reset Active flag is asserted when all of the trip thresholds for the four channels are exceeded, and these flag stays active for as long as any of the thresholds remain exceeded. A Manual Reset pin can also be used to clear the flag as needed.

The four channels of the TLC7703QPW can also be configured to operate in one of two modes. In Sequence Mode, the output is asserted after the predetermined delay and once the highest voltage among all of the channels has been exceeded. Alternatively, in Cascade Mode, the output is asserted when any one of the channels exceeds its trip threshold. This mode is often used in flexible applications where multiple thresholds are needed. The TLC7703QPW also offers an on-chip watch dog timer which can be used to set a time-out period for the fault output.

In addition to the power management capabilities offered by the TLC7703QPW, the device also features a wide variety of protections. The over-temperature protection (OTP) prevents the device from being damaged by high temperatures, and a built-in thermal shutdown feature helps further enhance the safety. Protection from reversely applied voltages is also provided, and the device has a low-power enable circuit that is used to reduce the power consumption when the device is not in use.

The TLC7703QPW can provide many advantages to applications needing voltage monitoring, such as FPGAs and memory devices. Its four channels, each capable of being independently set, provide flexibility in terms of the actual monitoring. The Power-On Reset delay allows the device to take the time to settle before resetting, and the two modes (Sequence or Cascade) enable it to be used in different settings. The built-in protections not only help protect the device itself, but also the circuits it is being used to monitor. With its wide selection of features and capabilities, the TLC7703QPW is a great option for many voltage supervisor needs.

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