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1.23-V Reference

Error

Amplifier

GND

OUTPUT

INPUT

LP2950, LP2951

SLVS582I – APRIL 2006 – REVISED NOVEMBER 2014

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7 Detailed Description

7.1 Overview

The LP2950 and LP2951 devices are bipolar, low-dropout voltage regulators that can accommodate a wide input

supply-voltage range of up to 30 V. The easy-to-use, 3-pin LP2950 is available in fixed-output voltages of 5 V,

3.3 V, and 3 V. However, the 8-pin LP2951 device is able to output either a fixed or adjustable output from the

LP2951 device outputs a fixed 5 V, 3.3 V, or 3 V (depending on the version). Alternatively, by leaving the SENSE

value between 1.235 V to 30 V.

The 8-pin LP2951 device also offers additional functionality that makes it particularly suitable for battery-powered

applications. For example, a logic-compatible shutdown feature allows the regulator to be put in standby mode

for power savings. In addition, there is a built-in supervisor reset function in which the ERROR output goes low

thermal shutdown.

The LP2950 and LP2951 devices are designed to minimize all error contributions to the output voltage. With a

tight output tolerance (0.5% at 25°C), a very low output voltage temperature coefficient (20 ppm typical),

extremely good line and load regulation (0.3% and 0.4% typical), and remote sensing capability, the parts can be

used as either low-power voltage references or 100-mA regulators.

7.2 LP2950 Functional Block Diagram

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