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PARALLEL-LDO-CALC

Parallel low-dropout (LDO) calculator

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PARALLEL-LDO-CALC

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Overview

The parallel low-dropout (LDO) calculator is a Microsoft® Excel®-based tool that provides worst-case analysis for parallel LDO regulators using ballast resistors. The tool helps the user identify the minimum number of parallel LDO regulators required and optimum ballast resistance for a system requirement set.

Data-sheet information for common LDO regulators used in parallel applications is prepopulated into the calculator. The user can evaluate which LDO regulator device best meets their system needs based on their system requirements.

Features
  • Determine minimum parallel LDO regulators required to meet set of parallel LDO system requirements
  • Automatically calculate optimum ballast resistor from parallel LDO system requirements
  • Integrated calculations automatically perform worst-case analysis to determine optimum ballast resistance and minimum number of parallel LDO regulators required
  • Supports multiple LDO regulator devices for user assessment
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Calculation tool

PARALLEL-LDO-CALC — Parallel low-dropout (LDO) calculator

Supported products & hardware

Supported products & hardware

Products
Linear & low-dropout (LDO) regulators
TPS7A57 — 5-A, low-input-voltage, low-noise, high-accuracy low-dropout (LDO) voltage regulator TPS7A47 — 1-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable TPS7A47-Q1 — Automotive 1-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable TPS7A4701-EP — Enhanced product, 36-V, 1-A, 4-μVRMS, RF LDO voltage regular TPS7A94 — 1-A, ultra-low noise, ultra-high PSRR, RF voltage regulator
Other power management
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PARALLEL-LDO-CALC — Parallel low-dropout (LDO) calculator

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Latest version
Version: 1.0
Release date: 05 Dec 2022
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PARALLEL-LDO-CALC.xlsx  — 47 K

Parallel low-dropout (LDO) calculator

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Products
Linear & low-dropout (LDO) regulators
TPS7A57 — 5-A, low-input-voltage, low-noise, high-accuracy low-dropout (LDO) voltage regulator TPS7A47 — 1-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable TPS7A47-Q1 — Automotive 1-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable TPS7A4701-EP — Enhanced product, 36-V, 1-A, 4-μVRMS, RF LDO voltage regular TPS7A94 — 1-A, ultra-low noise, ultra-high PSRR, RF voltage regulator
Other power management

Documentation

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SBVA093

Comprehensive Analysis and Universal Equations for Parallel LDO's Using Ballast Resistors

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SBVA100

Parallel LDO Architecture Design Using Ballast Resistors

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TIDA-050061

Scalable, High-Current, Low-Noise Parallel LDO Reference Design

Release Information

Initial Release

Supported products & hardware

Linear & low-dropout (LDO) regulators
TPS7A47 — 1-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable TPS7A47-Q1 — Automotive 1-A, 36-V, low-noise, high-PSRR, low-dropout voltage regulator with enable TPS7A4701-EP — Enhanced product, 36-V, 1-A, 4-μVRMS, RF LDO voltage regular TPS7A57 — 5-A, low-input-voltage, low-noise, high-accuracy low-dropout (LDO) voltage regulator TPS7A94 — 1-A, ultra-low noise, ultra-high PSRR, RF voltage regulator

Related design resources

Reference designs

REFERENCE DESIGN
TIDA-050061 — Scalable, high-current, low-noise parallel low-dropout (LDO) reference design

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