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LP2982

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SNVS128K – MARCH 2000 – REVISED JUNE 2016

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7 Detailed Description

7.1 Overview

The LP2982 is a 50-mA, fixed-output voltage regulator designed specifically to meet the requirements of battery-

powered applications. Available in assorted output voltages (refer to the package option addendum (POA) at the

back of this datasheet for the available voltage and package options), the device has an output tolerance of 1%

for the A grade (1.5% for the non-A version). Using a VIP process, the LP2982 contains these features to

facilitate battery-powered designs:

•

Fixed 5-V, 3.3-V, and 3-V output versions

•

Very high-accuracy 1.23-V reference

•

Low-dropout voltage, typical dropout of 120 mV at a 50-mA load current and 7 mV at 1-mA load

•

Low ground current, typically 375 μA at 50-mA load and 80 μA at 1-mA load

•

A sleep-mode feature is available, allowing the regulator to consume only 1 µA (typical) when the ON/OFF

pin is pulled low.

•

Overtemperature protection and overcurrent protection circuitry is designed to safeguard the device during

unexpected conditions.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Multiple Voltage Options

To meet the different application requirements, the LP2982 provides multiple fixed output options (see POA).

7.3.2 High-Accuracy Output Voltage

With special careful design to minimize all contributions to the output voltage error, the LP2982 distinguishes

itself as a very high-accuracy output voltage micropower LDO. This includes a tight initial tolerance (1% typical),

extremely good line regulation (0.007%/V typical), and a very low output voltage temperature coefficient, making

the device an ideal low-power voltage reference.

7.3.3 Ultra-Low-Dropout Voltage

Generally speaking, the dropout voltage often refers to the voltage difference between the input and output

programmed output voltage at which the output voltage is expected to remain within its accuracy boundary.