TPS3701DDCR

TPS3701DDCR

Part Number: TPS3701DDCR

Manufacturer: Texas Instruments

Description: Analog Comparators 36V Window Comparator with Internal Ref

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TPS3701DDCR Description

The TPS3701 operates from 1.8 V to 36 V as a wide-supply voltage window detector.  The device features two high-precision comparators, each of which has an internal reference voltage of 400 mV. Set the voltage being monitored with the help of external resistors and use the TPS3701 as either a window voltage detector or as two independent voltage monitors. A low is applied to the OUTA pin when the INA pin’s voltage drops below the negative threshold, and a high is applied when the INA pin’s value rises over the positive point.

At a particular positive value on the INB pin, OUTB is driven low, and at a negative voltage on the INB pin, OUTB is driven high.  Both of the comparators in the TPS3701 have built-in hysteresis for noise rejection. This allows the comparators to maintain stable output operation without accidentally setting off false triggers. The junction temperature range that the TPS3701 is specified for is from –40 degrees Celsius to 125 degrees Celsius. It comes in a package that is designated as a SOT-6.

TPS3701DDCR Features

  • An extensive range of supply voltages, ranging from 1.8 V to 36 V.
  • The threshold can be adjusted down to 400 mV.
  • Open-drain outputs for detecting voltages that are too high or too low.
  • Low quiescent current: 7 µA (Typical).
  • Hysteresis value on the inside: 5.5 mV (typical).
  • Temperatures can range anywhere from –40°C to +125°C.

Detailed Description

Overview

Two comparators, A and B, plus a precise reference, allow the TPS3701 to detect overvoltage and under-voltage. The TPS3701 has an ample supply voltage range (1.8 V to 36 V), high-accuracy window threshold voltages of 400 mV (0.75% over temperature), and built-in hysteresis. The supply voltage range can be found on the product’s datasheet. The outputs have a maximum sink current of 10 milliamperes and a voltage rating of 25 volts.

Feature Description

Inputs (INA, INB) The TPS3701 integrates two comparators and a precise reference voltage into a single package. Each comparator has one input connected to an external reference, while the other is connected to the comparator’s internal connection. The reference voltage is used to design and trim the INB rising threshold and the INA falling threshold. Both of these thresholds are intended to be equal to the reference voltage (400 mV).

When applied to the function of a window voltage detector, this configuration achieves the device’s highest possible level of precision. Both comparators also come equipped with hysteresis built-in, demonstrating their tolerance to noise and guaranteeing that they will continue to function normally. The INA and INB inputs range from ground to 1.7 V, with a maximum absolute value of 7.0 V. For noisy applications, a bypass capacitor of 1 nF to 10 nF should be placed across the comparator input. This procedure is carried to lessen the impact of brief voltage fluctuations in the signal under observation. Although it is not required in most situations, it is good analog design practice to do so.

Outputs (OUTA, OUTB)

The TPS3701’s outputs are typically connected to the reset or enable input of a processor (such as a DSP, ASIC, or other CPU) or a voltage regulator (such as a DC-DC converter or LDO). When the output is in a high-impedance condition, the TPS3701 has two open-drain outputs: OUTA and OUTB. Pull-up resistors must be used to keep these lines at a high level.

To make it possible for the outputs to be linked to other devices at the appropriate voltage levels for the interface, pull-up resistors must be attached to the appropriate voltage rails. Independent of the voltage at which the device is supplied, the TPS3701’s outputs can be pulled up to 25 V. When deciding on the settings of the pull-up resistors, you should give some thought to ensuring that the voltage levels are accurate. The value of the pull-up resistor is determined by the voltage on the output, the capacitive loading on the production, and the output leakage current, also known as ID(leak).

Application Information

The TPS3701 is a precise dual-voltage detector that may be configured to work in various environments. The monitored voltage, also known as VMON, the VDD voltage, and the output pull-up voltage can all be different voltages or coupled in any way the designer sees fit. The subsequent sections detail the connection configurations that can be used and the maximum allowable voltage for each arrangement.

The TPS3701 provides the highest level of precision when indicating an overvoltage or under-voltage condition. The undervoltage flag will fall as VIT–(INA) rises, and the overvoltage flag will rise as VIT+(INB) falls. These two threshold voltages have the maximum accuracy and coincide with the falling and rising flags, respectively. These thresholds are the VMON(UV) and VMON(OV) trigger voltages, and they show how accurate the monitoring system is when the monitored voltage is within the valid window. Both OUTA and OUTB are in a high-impedance state. If the measured voltage falls below the threshold for acceptable operation (VMON is less than the undervoltage limit), an error message will be displayed. If the measured voltage falls below the threshold for acceptable operation (VMON is less than the Undervoltage limit), an error message will be displayed. These voltages correspond with the monitored voltages VMON (UV HYS) and VMON (OV HYS), respectively. If the monitored voltage is within the valid window, then the monitored.

Final Thoughts

The TPS3701’s VDD pin can handle up to 40 V; however, 36 V is optimal for its operation. Extra care must be taken if the voltage supply powering VDD is prone to large voltage transients of more than 40 V or high voltage slew rates of more than 1 V/s. A high-frequency transient surge on the VDD pin can be filtered out by connecting an RC filter between the power source and the pin.

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