LP2980-N

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SNOS733O – APRIL 2000 – REVISED JUNE 2015

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 LP2980-N 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 0.5% accuracy and 50-mA maximum output current. Efficiency is defined by the ratio

of output voltage to input voltage because the LP2980-N is a linear voltage regulator. To achieve high efficiency,

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, startup, noise, power supply rejection

ratio (PSRR), or any other transient specification is required, then the design becomes more challenging. This

section discusses the implementation and behavior of the LP2980-N LDO.

8.2 Typical Application

*ON/OFF input must be actively terminated. Tie to if this function is not to be used.

**Minimum output capacitance is 1

μF to ensure stability over full load current range. More capacitance provides

superior dynamic performance and additional stability margin (see Output Capacitor Recommendation).

***Do not make connections to this pin.

8.2.1 Design Requirements

PARAMETER

DESIGN REQUIREMENT

Input voltage

5 V ±10%, provided by the DC-DC converter switching at 1 MHz

Output voltage

3.3 V ±5%

Output current

50 mA (maximum), 1 mA (minimum)

RMS noise, 300 Hz to 50 kHz

PSRR at 1 kHz

> 40 dB

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