TLV7021 datasheet(17/44 Pages) TI

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+5 V

100 k

LOAD

1 MW

5 V

0 V

1.67 V

3.33 V

O High

O Low

V = V

= V

R2 || R3

R1 + (R2 || R3)

= V

(R1 || R3) + R2

TLV7011, TLV7021, TLV7012, TLV7022

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SLVSDM5F – SEPTEMBER 2017 – REVISED MARCH 2020

Product Folder Links: TLV7011 TLV7021 TLV7012 TLV7022

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8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The TLV701x and TLV702x are micro-power comparators with reasonable response time. The comparators have

a rail-to-rail input stage that can monitor signals beyond the positive supply rail with integrated hysteresis. When

higher levels of hysteresis are required, positive feedback can be externally added. The push-pull output stage of

the TLV701x is optimal for reduced power budget applications and features no shoot-through current. When level

shifting or wire-ORing of the comparator outputs is needed, the TLV702x with its open-drain output stage is well

suited to meet the system needs. In either case, the wide operating voltage range, low quiescent current, and

micro-package of the TLV701x and TLV702x make these comparators excellent candidates for battery-operated

and portable, handheld designs.

8.1.1 Inverting Comparator With Hysteresis for TLV701x

The inverting comparator with hysteresis requires a three-resistor network that is referenced to the comparator

supply voltage (VCC), as shown in Figure 33. When VIN at the inverting input is less than VA, the output voltage is

high (for simplicity, assume VO switches as high as VCC). The three network resistors can be represented as R1

|| R3 in series with R2. Equation 1 defines the high-to-low trip voltage (VA1).

(1)

When VIN is greater than VA, the output voltage is low, very close to ground. In this case, the three network

resistors can be presented as R2 || R3 in series with R1. Use Equation 2 to define the low to high trip voltage

(VA2).

(2)

Equation 3 defines the total hysteresis provided by the network.

(3)

Figure 33. TLV701x in an Inverting Configuration With Hysteresis

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