LP2982 Datasheet, PDF (13/28 Pages) National Semiconductor (TI) – Micropower 50 mA Ultra Low-Dropout Regulator

www.ti.com
7 Detailed Description
LP2982
SNVS128K – MARCH 2000 – REVISED JUNE 2016
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
voltage (V_DO = V_IN – V_OUT), where the main current pass element (PNP) is fully on and is characterized by the
classic V_CE(SAT) of the transistor. V_DO indirectly specifies a minimum input voltage above the nominal
programmed output voltage at which the output voltage is expected to remain within its accuracy boundary.
Copyright © 2000–2016, Texas Instruments Incorporated
Product Folder Links: LP2982
Submit Documentation Feedback
13