80- A

µ

Current Regulator

80 µA

60 µA

10 µA

VCC

10 µA

OUT

GND

IN+

IN−

Epi-FET

Diodes

Resistors

Transistors

COMPONENT COUNT

1

2

2

30

LM193, LM293, LM293A, LM393, LM393A, LM2903, LM2903V

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SLCS005Y – OCTOBER 1979 – REVISED JUNE 2015

7 Detailed Description

7.1 Overview

The LM2903 is a dual 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 very wide supply voltages

range (2 V to 36 V), low Iq and fast response of the devices.

the comparator to be used in AND functionality.

7.2 Functional Block Diagram

Figure 6. Schematic (Each Comparator)

7.3 Feature Description

LM2903 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

enables much head room for modern day supplies of 3.3 V and 5 V.

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

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

7.4 Device Functional Modes

7.4.1 Voltage Comparison

The LM2903 operates solely as a voltage comparator, comparing the differential voltage between the positive

and negative pins and outputting a logic low or high impedance (logic high with pullup) based on the input

differential polarity.

Copyright © 1979–2015, Texas Instruments Incorporated

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Product Folder Links: LM193 LM293 LM293A LM393 LM393A LM2903 LM2903V