IN

-

V±

V+

+

OUT

Micro-

Controller

UV

VDD

VPULL-UP

REF

1.7 to 5.5 V

TLV7081

Battery

Copyright © 2017, Texas Instruments Incorporated

12

TLV7081

SNOSD69A – MAY 2018 – REVISED JUNE 2018

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Copyright © 2018, Texas Instruments Incorporated

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 TLV7081 is a 4-pin, nano-power comparator with open-drain output that is well suited for monitoring battery

voltages. The TLV7081's benefits include a small package footprint and a unique input stage that allows the

comparator input to be driven by a voltage source even when the operating voltage for the comparator is turned-

off (zero volts).

8.2 Typical Applications

8.2.1 Nano-Power Battery Monitor

The application of the TLV7081 for an under-voltage detection circuit is shown in Figure 21.

Figure 21. Under-Voltage Detection

8.2.1.1 Design Requirements

For this design, follow these design requirements:

•

The supply voltage connected to pin (V+) serves as the reference voltage for the comparator and can be any

voltage between 1.7 V and 5.5 V.

•

The voltage applied to the input pin (IN) can be any voltage in the range of 0 V to 5.6 V. This voltage range is

uniquely independent of the supply voltage applied to pin (V+).

•

The comparator output pin (OUT) requires a pull-up resistor that sets the output-high logic level (VOH) for the

comparator. VPULL-UP should be connected to the supply voltage of the microcontroller which is monitoring the

comparator output and serves as the level-shifting block for the logic levels in the application.