LP2983 Datasheet, PDF (10/25 Pages) National Semiconductor (TI) – Micropower 150 mA Voltage Regulator in SOT-23 Package For Output Voltages 1.2V Designed for Use with Very Low ESR Output Capacitors

LP2983
SNVS170D – OCTOBER 2001 – REVISED APRIL 2016
7 Detailed Description
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7.1 Overview
The LP2983 is a voltage regulator with optimized vertically integrated PNP designed for use with very low ESR
output capacitors, excellent for low noise applications that require a clean voltage supply. The LP2983 has a
wide input voltage range (16 V maximum), high accuracy (A grade 1%), and a fixed output voltage supply
capable of delivering 150 mA. In addition the LP2983 device provides the following features:
• High accuracy output voltage
• Low ground current, typically 825 μA at 150-mA load and 75 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 designed to safeguard the device during
unexpected conditions.
• Thermal protection
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 LP2983 distinguishes
itself as a very high-accuracy output voltage micropower LDO. This includes a tight initial tolerance (typically
1.5% at 50 mA, 25°C junction temperature; also available in A grade with an accuracy of 1% under the same
conditions), extremely good line regulation (0.01%/V typical), and a very low output-voltage temperature
coefficient, making the part an ideal low-power voltage reference.
7.3.2 Low Ground Current
The LP2983 device uses a vertical PNP process which allows for quiescent currents that are considerably lower
than those associated with traditional lateral PNP regulators, typically 825 μA at 150-mA load and 75 μA at 1-mA
load.
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