MON(UV)

IT

R1

V

= 1 +

× V

R2

§

·

¨

¸

©

¹

0.01 F

VDD

SENSE

OUT

GND

R1

2.21 MŸ

R2

83.5 kŸ

VPULLUP

Up to 18 V

1.8 V to 18 V

VMON

RP

49.9 kŸ

To a reset or enable

input of the system.

13

TLV6703

www.ti.com

SBOS865B – JANUARY 2018 – REVISED NOVEMBER 2019

Product Folder Links: TLV6703

Submit Documentation Feedback

Copyright © 2018–2019, Texas Instruments Incorporated

9.2 Typical Application

The TLV6703 device is a wide-supply voltage comparator that operates over a VDD range of 1.8 to 18 V. The

monitored voltage is set with the use of external resistors, so the device can be used either as a precision

voltage monitor.

Figure 17. Wide VIN Voltage Monitor

9.2.1 Design Requirements

For this design example, use the values summarized in Table 3 as the input parameters.

Table 3. Design Parameters

PARAMETER

DESIGN REQUIREMENT

DESIGN RESULT

Monitored voltage

12-V nominal rail with maximum falling

threshold of 10%

VMON(UV)= 10.99 V (8.33%)

9.2.2 Detailed Design Procedure

9.2.2.1 Resistor Divider Selection

The resistor divider values and target threshold voltage can be calculated by using Equation 1 to determine

VMON(UV).

(1)

where

•

R1 and R2 are the resistor values for the resistor divider on the SENSEx pins

•

VMON(UV) is the target voltage at which an undervoltage condition is detected

Choose RTOTAL ( = R1 + R2) so that the current through the divider is approximately 100 times higher than the

input current at the SENSE pin. The resistors can have high values to minimize current consumption as a result

of low input bias current without adding significant error to the resistive divider. For details on sizing input

resistors, refer to application report SLVA450, Optimizing Resistor Dividers at a Comparator Input, available for

download from www.ti.com.