LP2986_15 Datasheet, PDF (13/33 Pages) Texas Instruments – LP2986 Micropower, 200-mA Ultra-Low-Dropout Fixed or Adjustable Voltage Regulator

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7 Detailed Description
LP2986
SNVS137I – MARCH 1999 – REVISED SEPTEMBER 2015
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
low when V_OUT drops by 5% of its nominal value for whatever reasons – due to a drop in V_IN, current limiting, or
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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