7 Detailed Description

7.1 Overview

The LM2901-Q1 family is a quad comparator with the ability to operate up to 36 V on the supply pin. This

standard device has proven ubiquity and versatility across a wide range of applications. This is due to it's very

wide supply voltages range (2 V to 36 V), low Iq and fast response.

This device is AEC-Q100 qualified and can operate over a wide temperature range of –40°C to 125°C .

The open-drain output allows the user to configure the output's logic low voltage (VOL) and can be utilized to

enable the comparator to be used in AND functionality.

The "B" versions add dedicated ESD protections on all the pins for improved ESD performance as well as

improved negative input voltage handling. Please see Application Note SNOAA35 for more information

7.2 Functional Block Diagram

GND

IN–

IN+

10 µA

OUT

VCC

60 µA

80-µA

Current

Regulator

10 µA

80-µA

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7.3 Feature Description

LM2901-Q1 family consists of a PNP Darlington pair input, allowing the device to operate with very high gain

and fast response with minimal input bias current. The input Darlington pair creates a limit on the input common

mode voltage capability, allowing LM2901-Q1 to accurately function from ground to VCC–1.5V differential input.

This is enables much head room for modern day supplies of 3.3 V and 5.0 V.

The output consists of an open drain NPN (pull-down or low side) transistor. The output NPN will sink current

when the negative input voltage is higher than the positive input voltage and the offset voltage. The VOL is

resistive and will scale with the output current. Please see Figure 6-19, Figure 6-20 and Figure 6-21 for VOL

values with respect to the output current.

The special pinout of this device separates input pins from the output pins to reduce parasitic coupling between

input and output.

7.4 Device Functional Modes

7.4.1 Voltage Comparison

The LM2901-Q1 family of devices operates solely as a voltage comparator, comparing the differential voltage

between the positive and negative pins and outputs a logic low or high impedance (logic high with pullup) based

on the input differential polarity.

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LM2901-Q1, LM2901V-Q1, LM2901AV-Q1, LM2901B-Q1

SLCS142G – DECEMBER 2003 – REVISED MARCH 2023

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Product Folder Links: LM2901-Q1 LM2901V-Q1 LM2901AV-Q1 LM2901B-Q1