Application Note
R16AN0012EU0100 Rev.1.0 Page 1
Jun 15, 2021 © 2021 Renesas Electronics
This document discusses the Simetrix model for the RAA214020 LDO including the features supported and not
supported by the model. To download the model, see the RAA214020 product page.
Contents
1. Simetrix Model Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 Device Performance Features Supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 Device Performance Features NOT Supported . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
2. Downloading and Running the Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
3. License Statement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1. Simetrix Model Features
This Simetrix Macromodel is intended to give typical DC and AC performance characteristics under a wide range
of external circuit configurations using compatible simulation platforms such as iSim PE.
1.1 Device Performance Features Supported
The following are the device performance features that are supported by this model.
▪ Device parameters are set to typical room temperature values
▪ Gain and phase
▪ Input noise terms including 1/f effects
▪ PSRR
▪ Transient V
IN
, V
OUT
, and Load. Reference the Excel spreadsheet that is included with the SPICE software
(Figure 1), for test results (RAA214020 Simetrix Model Validations.xlsx).
▪ Output current limit
▪ Enable and Disable function using the Enable pin
▪ Power-Good through the PG pin
▪ UVLO <1V and 300Ω output impedance
▪ 300Ω output pull-down when part is disabled and V
IN
> 1V.
▪ 300Ω output pull-down when part is enabled and 1V < V
IN
> 2.5V.
1.2 Device Performance Features NOT Supported
The following are the device performance features that are NOT supported by this model.
▪ Harmonic distortion effects
▪ Thermal effects and/or over-temperature
▪ Parameter variation
▪ Part-to-part performance variation because of normal process parameter spread
▪ Any performance difference arising from different packaging
RAA214020 Simetrix Model
R16AN0012EU0100 Rev.1.0 Page 2
Jun 15, 2021
RAA214020 Simetrix Model Application Note
2. Downloading and Running the Software
The RAA214020 Simetrix model software can be down loaded from the RAA214020 product page.
Save the file to a common directory for your Simetrix simulations. This application note assumes you have a basic
knowledge of running Simetrix simulations. There are four different files to run simulations (Figure 1). Each file is
setup to evaluate a specific test (GainPhase, Noise, PSRR, and Transient tests). An Excel spreadsheet is also
provided documenting the validation of the model. Figure 2 shows the Gain Phase simulation schematic. To run
the test, click Simulator then Run Schematic in the tool bar. From here, your can copy and paste the sub-circuit
into your design.
Figure 1. RAA214020 Simetrix Model Software
Figure 2. Gain Phase Test Setup with Sub-Circuit RAA214020FDSubCKTrev04
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