Dual 0.275% Comparators and Reference

with Programmable Hysteresis

ADCMP341/ADCMP343

Rev. 0

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FEATURES

400 mV ± 0.275% threshold

User programmable hysteresis via resistor string

Supply range: 1.7 V to 5.5 V

Low quiescent current: 6.5 μA typical

Input range includes ground

Low input bias current: ±5 nA maximum

Open-drain outputs

Supports wired-AND connections

Input polarities:

ADCMP341 noninverting

ADCMP343 inverting

Small SOT-23 package

APPLICATIONS

Portable applications

Li-Ion monitoring

Handheld instruments

LED/relay driving

Optoisolator driving

Control systems

GENERAL DESCRIPTION

The ADCMP341/ADCMP343 consist of two low power, high

accuracy comparators with a 400 mV reference in an 8-lead

SOT-23 package. Operating within a supply range of 1.7 V to

5.5 V, the devices only draw 6.5 μA (typical), making them ideal

for low voltage system monitoring and portable applications.

Hysteresis is determined using three resistors in a string configura-

tion with the upper and lower tap points connected to the

±INA_U and ±INA_L pins of each comparator, respectively.

The state of the outputs of the comparators selects which pin is

internally connected to the comparators input. Therefore, a

change of state in the comparators output results in one of the

inputs being switched in to the comparator and the other being

switched out. This provides the user with a fully flexible and

accurate method of setting the hysteresis. One input of each

comparator is internally connected to the reference. The other

input is available externally, via an internal mux, through pins

±INA_U or ±INA_L. The state of the output determines which

of these pins is connected at any one time.

The comparator outputs are open-drain with the output stage

sinking capability guaranteed greater than 5 mA over temperature.

The ADCMP341 has noninverting inputs and the ADCMP343

has inverting inputs. The devices are suitable for portable,

commercial, industrial, and automotive applications.

FUNCTIONAL BLOCK DIAGRAMS

+INA_U

+INB_U

OUTA

OUTB

GND

400mV

ADCMP341

+INA_L

+INB_L

VINB

VINA

R1

R2

R3

Figure 1. ADCMP341

–INA_U

–INB_U

OUTA

OUTB

GND

400mV

ADCMP343

–INA_L

–INB_L

VINB

VINA

R1

R2

R3

Figure 2. ADCMP343

CH2 500mV

2

1

OUTA

R1 = 22kΩ

R2 = 2.2kΩ

R3 = 6.2kΩ

M100ms