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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
TPS7A33 — 1-A, high-PSRR, negative, adjustable low-dropout voltage regulator with enable TPS7A45 — 1.5-A, 20-V, ultra-low-dropout voltage regulator with reverse current protection & enable TPS7A4501-SP — Radiation-hardened, QMLV, 1.5-V to 20-V input 1.5-A low-dropout (LDO) regulator TPS7A47 — 1A, 36V low-noise high-PSRR low-dropout voltage regulator with enable TPS7A47-Q1 — Automotive, 1A, 36V low-noise high-PSRR low-dropout voltage regulator with enable TPS7A4701-EP — Enhanced-product, 36V, 1A 4μVRMS RF low-dropout voltage regular TPS7A52 — 2-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator TPS7A52-Q1 — Automotive 2-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator TPS7A53 — 3-A, low-VIN (1.1 V) low-noise high-accuracy ultra-low-dropout (LDO) voltage regulator TPS7A53-Q1 — Automotive, 3-A, low-VIN (1.1 V) low-noise high-accuracy ultra-low-dropout (LDO) voltage regulator TPS7A53A-Q1 — Automotive, 3-A, low-VIN 5.6-µVRMS low-noise high-accuracy ultra-low dropout voltage regulator TPS7A53B — 3-A, 1.1-V, low-VIN, low-noise high-accuracy ultra-low-dropout voltage regulator with 0.5-V low VREF TPS7A54 — 4-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator TPS7A54-Q1 — Automotive 4-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator TPS7A56 — 6A, low-input-voltage, low-noise, high-accuracy low-dropout (LDO) voltage regulator TPS7A57 — 5-A, low-input-voltage, low-noise, high-accuracy low-dropout (LDO) voltage regulator TPS7A8300 — 2-A, low-VIN, low-2-A, low-VIN, low-noise, ultra-low-dropout voltage regulator with power good wi TPS7A83A — 2-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout voltage regulator with power good TPS7A84 — 3-A, low-VIN, low-noise, ultra-low-dropout voltage regulator with power good with high-accuracy TPS7A84A — 3-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout voltage regulator with power good TPS7A85 — 4-A, low-VIN, low-noise, ultra-low-dropout voltage regulator with power good with high-accuracy TPS7A85A — 4-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout voltage regulator with power good TPS7A90 — 500-mA, low-noise, high-PSRR, adjustable ultra-low-dropout voltage regulator with high-accuracy TPS7A91 — 1-A, low-noise, high-PSRR, adjustable ultra-low-dropout voltage regulator with high-accuracy TPS7A92 — 2-A, low-noise, high-PSRR, adjustable ultra-low-dropout voltage regulator with high-accuracy TPS7A94 — 1-A, ultra-low noise, ultra-high PSRR, RF voltage regulator TPS7A96 — 2-A, ultra-low noise ultra-high PSRR RF voltage regulator TPS7B4253-Q1 — Automotive 300-mA, off-battery (40-V), adjustable voltage-tracking low-dropout voltage regulator TPS7B4260-Q1 — Automotive 300mA 40V voltage-tracking low-dropout regulator with feedback and 6mV tracking tolerance TPS7B4261-Q1 — Automotive 300mA 40V voltage-tracking low-dropout regulator with independent enable and power good TPS7B7702-Q1 — Automotive 300-mA, off-battery (40-V), dual-channel adjustable antenna low-dropout voltage regulator TPS7H1111-SEP — Radiation-tolerant, 1.5A, ultra-low-noise ultra-high-PSRR RF LDO regulator TPS7H1111-SP — Radiation-hardened, QMLV and QMLP, 1.5A ultra-low-noise high-PSRR low-dropout (LDO) regulator TPS7N59 — 10A, low input voltage, low-noise high-accuracy ultra-low dropout (LDO) voltage regulator
Hardware development
Reference design
TIDA-050061 — Scalable, high-current, low-noise parallel low-dropout (LDO) reference design
Evaluation board
TPS7A57EVM-081 — TPS7A57 evaluation module for 5-A low-noise high-accuracy low-dropout (LDO) voltage regulator
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PARALLEL-LDO-CALC — Parallel low-dropout (LDO) calculator

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Latest version
Version: 2.0.4
Release date: Mar 19, 2026
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PARALLEL-LDO-CALC.xlsx  — 113 K

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Products
Linear & low-dropout (LDO) regulators
TPS7A33 — 1-A, high-PSRR, negative, adjustable low-dropout voltage regulator with enable TPS7A45 — 1.5-A, 20-V, ultra-low-dropout voltage regulator with reverse current protection & enable TPS7A4501-SP — Radiation-hardened, QMLV, 1.5-V to 20-V input 1.5-A low-dropout (LDO) regulator TPS7A47 — 1A, 36V low-noise high-PSRR low-dropout voltage regulator with enable TPS7A47-Q1 — Automotive, 1A, 36V low-noise high-PSRR low-dropout voltage regulator with enable TPS7A4701-EP — Enhanced-product, 36V, 1A 4μVRMS RF low-dropout voltage regular TPS7A52 — 2-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator TPS7A52-Q1 — Automotive 2-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator TPS7A53 — 3-A, low-VIN (1.1 V) low-noise high-accuracy ultra-low-dropout (LDO) voltage regulator TPS7A53-Q1 — Automotive, 3-A, low-VIN (1.1 V) low-noise high-accuracy ultra-low-dropout (LDO) voltage regulator TPS7A53A-Q1 — Automotive, 3-A, low-VIN 5.6-µVRMS low-noise high-accuracy ultra-low dropout voltage regulator TPS7A53B — 3-A, 1.1-V, low-VIN, low-noise high-accuracy ultra-low-dropout voltage regulator with 0.5-V low VREF TPS7A54 — 4-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator TPS7A54-Q1 — Automotive 4-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout (LDO) voltage regulator TPS7A56 — 6A, low-input-voltage, low-noise, high-accuracy low-dropout (LDO) voltage regulator TPS7A57 — 5-A, low-input-voltage, low-noise, high-accuracy low-dropout (LDO) voltage regulator TPS7A8300 — 2-A, low-VIN, low-2-A, low-VIN, low-noise, ultra-low-dropout voltage regulator with power good wi TPS7A83A — 2-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout voltage regulator with power good TPS7A84 — 3-A, low-VIN, low-noise, ultra-low-dropout voltage regulator with power good with high-accuracy TPS7A84A — 3-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout voltage regulator with power good TPS7A85 — 4-A, low-VIN, low-noise, ultra-low-dropout voltage regulator with power good with high-accuracy TPS7A85A — 4-A, low-VIN (1.1-V), low-noise, high-accuracy, ultra-low-dropout voltage regulator with power good TPS7A90 — 500-mA, low-noise, high-PSRR, adjustable ultra-low-dropout voltage regulator with high-accuracy TPS7A91 — 1-A, low-noise, high-PSRR, adjustable ultra-low-dropout voltage regulator with high-accuracy TPS7A92 — 2-A, low-noise, high-PSRR, adjustable ultra-low-dropout voltage regulator with high-accuracy TPS7A94 — 1-A, ultra-low noise, ultra-high PSRR, RF voltage regulator TPS7A96 — 2-A, ultra-low noise ultra-high PSRR RF voltage regulator TPS7B4253-Q1 — Automotive 300-mA, off-battery (40-V), adjustable voltage-tracking low-dropout voltage regulator TPS7B4260-Q1 — Automotive 300mA 40V voltage-tracking low-dropout regulator with feedback and 6mV tracking tolerance TPS7B4261-Q1 — Automotive 300mA 40V voltage-tracking low-dropout regulator with independent enable and power good TPS7B7702-Q1 — Automotive 300-mA, off-battery (40-V), dual-channel adjustable antenna low-dropout voltage regulator TPS7H1111-SEP — Radiation-tolerant, 1.5A, ultra-low-noise ultra-high-PSRR RF LDO regulator TPS7H1111-SP — Radiation-hardened, QMLV and QMLP, 1.5A ultra-low-noise high-PSRR low-dropout (LDO) regulator TPS7N59 — 10A, low input voltage, low-noise high-accuracy ultra-low dropout (LDO) voltage regulator
Hardware development
Reference design
TIDA-050061 — Scalable, high-current, low-noise parallel low-dropout (LDO) reference design
Evaluation board
TPS7A57EVM-081 — TPS7A57 evaluation module for 5-A low-noise high-accuracy low-dropout (LDO) voltage regulator

Release Information

Initial Release

What's new

  • Added the TPS7A45, TPS7A56, TPS7B4253-Q1, TPS7B4260-Q1, TPS7B4261-Q1, and TPS7N59 to the calculator.

Related design resources

Reference designs

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

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