TLV4021 datasheet(22/36 Pages) TI

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Equation 1 is derived from the analysis of Figure 9-4.

(1)

where

• R1 and R2 are the resistor values for the resistor divider connected to IN

• VBAT is the voltage source that is being monitored for an undervoltage condition.

• VIT- is the falling edge threshold where the comparator output changes state from high to low

Rearranging Equation 1 and solving for R1 yields Equation 2.

(2)

For the specific undervoltage detection of 2.0 V using the TLV4041R1, the following results are calculated.

(3)

where

• R2 is set to 1 MΩ

• VBAT is set to 2.0 V

• VIT- is set to1.18 V

Choose RTOTAL (R1 + R2) such that the current through the divider is at least 100 times higher than the input bias

current (IBIAS). The resistors can have high values to minimize current consumption in the circuit without adding

significant error to the resistive divider.

9.2.1.3 Application Curve

Under-Voltage

Alert

Normal Operating

Voltage

Normal Operating

Voltage

OUT

3.3V

2.03V

Figure 9-5. Under-Voltage Detection

TLV4021, TLV4031, TLV4041, TLV4051

SNVSB04C – MARCH 2019 – REVISED DECEMBER 2021

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