LP2986

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SNVS137I – MARCH 1999 – REVISED SEPTEMBER 2015

7 Detailed Description

7.1 Overview

The LP2986 is a bipolar, low-dropout (LDO) voltage regulator that can accommodate a wide input supply-voltage

range of up to 16 V. The LP2986 LDO is able to output either a fixed or adjustable output from the same device.

By tying the OUT and SENSE pins together, and the FEEDBACK and TAP pins together, the LP2986 device

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

open and connecting FEEDBACK to an external resistor divider, the output can be set to any value between 2.1

V to 16 V. The LP2986 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

thermal shutdown.

The LP2986 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 and remote sensing capability, the part can be used as either low-power voltage reference or

200-mA regulator.

Multiple features of the device include:

•

Very high-accuracy 1.23-V reference

•

Sleep mode

•

Error flag output

•

Internal protection circuitry, such as overcurrent limit, and thermal shutdown.

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 LP2989 distinguishes

itself as a very high output-voltage-accuracy micro-power LDO. This includes a tight initial tolerance (0.5%

typical, A grade), extremely good line regulation (0.007%/V typical).

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Product Folder Links: LP2986