Linear Regulator & LDO Calculator
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Electrical & Electronics

Linear Regulator & LDO Calculator

Estimate linear-regulator power loss, efficiency, dropout margin, junction temperature and load limits.

01

Your inputs

Steady-state estimate; θJA depends on PCB and airflow. Use datasheet values at the required load and temperature.

Power and heat assume the target output is regulated. A negative dropout margin means it cannot be maintained.

TI SNVA419C

02

Your results

Regulator dissipation
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Estimated efficiency
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Dropout margin
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Junction temperature estimate
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Temperature margin
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Maximum load within entered limits
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Formula—

Transistor Thermal & Heatsink Calculator

How to use this tool

  1. Input voltage · Target output voltage · Load current
  2. Quiescent current · Required dropout voltage · Junction to ambient
  3. Your results · Temperature margin · Print results