VCC

OUT

IN−

IN+

8

LP358, LP2904

SLOS475A – AUGUST 2005 – REVISED MAY 2017

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Copyright © 2005–2017, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

The LP358 and LP2904 devices consist of two independent, low-power, unity-gain, stable operational amplifiers

designed to operate from a single supply over a wide range of voltages. Operation from split supplies also is

possible. The input voltage range includes ground and extends up to VCC – 1.5 V. The output cannot drive to

either rail, however, loads terminated to ground can support VOL as low as ground. Loads to VCC can support VOH

as high as VCC.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 Power Efficient Output Stage

Darlington source driver and emitter follower sink driver will pass bias current through the load to keep device

quiescent current independent of load current.

8.3.2 Input Common-Mode Range

The valid common-mode range is from device ground to VCC – 1.5 V. Inputs may exceed VCC up to the maximum

VCC without device damage. At least one input must be in the valid input common-mode range for output to be

correct phase. If both inputs exceed valid range then output phase is undefined. If either input is less than –0.3 V

then input current must be limited to 1 mA and output phase is undefined.

8.4 Device Functional Modes

These devices are powered on when the supply is connected. This device can be operated as a single-supply

operational amplifier or dual-supply amplifier depending on the application.