LP2989

SNVS083O – FEBRUARY 2005 – REVISED MARCH 2015

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8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LP2989 is a linear voltage regulator operating from 2.1 V to 16 V on the input and regulates voltages

between 2.5 V to 5 V with 0.75% accuracy and 500 mA maximum outputs current. Efficiency is defined by the

ratio of output voltage to input voltage because the LP2989 is a linear voltage regulator. To achieve high

Successfully implementing an LDO in an application depends on the application requirements. If the

requirements are simply input voltage and output voltage, compliance specifications (such as internal power

dissipation or stability) must be verified to ensure a solid design. If timing, start-up, noise, PSRR, or any other

transient specification is required, the design becomes more challenging. This section discusses the

implementation and behavior of the LP2989 LDO.

8.2 Typical Application

*Capacitance values shown are minimum required to assure stability, but may be increased without limit. Larger

output capacitor provides improved dynamic response. See the Output Capacitor section.

**Shutdown must be actively terminated (see the Shutdown Input Operation section). Tie to IN (pin 4) if not use.

Figure 40. Typical Application Schematic

8.2.1 Design Requirements

DESIGN PARAMETER

DESIGN REQUIREMENT

Input voltage

6.5 V, ±10%,

Output voltage

5 V, ±1%

Output current

500 mA (maximum), 1 mA (minimum)

RMS noise, 100 Hz to 100 kHz

18

PSRR at 1 kHz

60 dB typical

16

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