LP2989

SNVS083O – FEBRUARY 2005 – REVISED MARCH 2015

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7 Detailed Description

7.1 Overview

The LP2989 device is a very high-accuracy micro-power voltage regulator with low quiescent current (75

μA

typical) and low dropout voltage (typical 40 mV at light loads and 380 mV at 100 mA). It is ideally suited for use

in battery-powered systems. The LP2989 block diagram contains several features, including:

•

Very high-accuracy 1.23-V reference

•

Fixed 2.5-V to 5-V versions

•

Shutdown input

•

Error flag output

•

Internal protection circuitry, such as foldback current limit, and thermal shutdown

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 High-Accuracy Output Voltage

With special careful design to minimize all contributions to the output voltage error, the LP2989 distinguishes

itself as a very high output-voltage-accuracy micro-power LDO. This includes a tight initial tolerance (.75%

typical), making the device an ideal a low-power voltage reference.

7.3.2 Sleep Mode

When pulling SHUTDOWN pin to low levels, the LP2989 enters shutdown mode, and a very low quiescent

current is consumed. This function is designed for applications which needs a shutdown mode to effectively

enhance battery life cycle.

7.3.3 Error Detection Comparator Output

The LP2989 will generate a logic low output whenever its output falls out of regulation by more than

approximately 5%. Refer to Application and Implementation for more details.

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