LP2950-N, LP2951-N
SNVS764Q –JANUARY 2000–REVISED DECEMBER 2017
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8 Detailed Description
8.1 Overview
The LP2950-N and LP2951-N are very high accuracy micro power voltage regulators with low quiescent current
(75 µA typical) and low dropout voltage (typical 40 mV at light loads and 380 mV at 100 mA). They are ideally
suited for use in battery-powered systems.
The LP2950-N and LP2951-N block diagram contains several features, including:
•
•
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Very high accuracy 1.23-V reference;
Fixed 5-V, 3-V, and 3.3-V versions; and
Internal protection circuitry, such as foldback current limit, and thermal shutdown.
The LP2951-N VERSIONS ONLY:
•
Fixed 5-V, 3-V, and 3.3-V versions and programmable output version from 1.24 V to 29 V with an external
pair of resistors;
•
•
Shutdown input, allowing turn off the regulator when the SHUTDOWN pin is pulled low; and
Error flag output, which may be used for a power-on reset.
8.2 Functional Block Diagrams
Figure 33. LP2950-N Functional Block Diagram
Figure 34. LP2951-N Functional Block Diagram
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