SENSE

GND

VDD

UV

OV

Reference

SET

Threshold

Logic

TPS3702-Q1

SBVS261B – APRIL 2015 – REVISED DECEMBER 2015

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7 Detailed Description

7.1 Overview

The TPS3702-Q1 family of devices combines two comparators and a precision reference for overvoltage and

undervoltage detection. The TPS3702-Q1 features a wide supply voltage range (2 V to 18 V) and highly accurate

window threshold voltages (0.9% over temperature). The TPS3702-Q1 is designed for systems that require an

active low signal if the voltage from the monitored power supply exits the accuracy band. The outputs can be

pulled up to 18 V and can sink up to 10 mA.

Unlike many other window comparators, the TPS3702-Q1 includes the resistors used to set the overvoltage and

undervoltage thresholds internal to the device. These internal resistors allow for lower component counts and

greatly simplifies the design because no additional margins are needed to account for the accuracy of external

resistors.

The TPS3702-Q1 is designed to assert active low output signals when the monitored voltage is outside the

window band. The relationship between the monitored voltage and the states of the outputs is shown in Table 1.

Table 1. Truth Table

CONDITION

OUTPUT

STATUS

UV low

UV is asserted

UV high

UV is high impedance

OV low

OV is asserted

OV high

OV is high impedance

7.2 Functional Block Diagram

10

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