External Power Supplies (including Mobile Phone Chargers)

calculator image 

New Efficiency Compliance Calculator from PI

Are you tired of having to consult multiple sources when checking the efficiency compliance of your EPS designs? If so, check out PI's new External Power Supply Efficiency Compliance Calculator. Simply enter your data into our calculator and see if it complies with current world-wide energy efficiency regulations.

The EPA estimates that there are more than 3 billion units in use in the US and about 10 billion in use globally.

Efficiency Requirements for External Power Supplies and Cellphone Chargers

China USB Charger Spec


See the Technical Requirement and Test Method of Charger and Interface for Mobile Telecommunication Terminal Equipment

EC Code of Conduct

(European Union)

See the EC CoC page for detailed specifications.

The European Commission’s version 4 of the Code of Conduct for External Power Supplies is now in effect.

EC Ecodesign Directive for ErPs

(European Union)

EC Ecodesign directive for EPS standard

EC IPP Mobile Device Charger Rating

IPP Project page
Star rating description

Major mobile phone manufacturers have developed a no-load power consumption rating system using a star labeling scheme.

Energy Saving


External Power Supply -No load: 0.8 W

Battery Charger - No load: 0.8 W


NOTE: The ENERGY STAR specification for External Power Supplies (EPS) and End-Use Products Using External Power Supplies (EUP) were sunset on December 31, 2010. For more information, see:

U. S. Energy Independence and Security Act of 2007 (EISA 2007)

The Energy Independence and Security Act of 2007 (EISA2007) is a mandatory efficiency standard for external power supplies sold in the US and rated ≤250 W (effective date - July 1, 2008).

See the EISA2007 page for detailed specifications.

NOTE: Please refer to individual program specifications for latest standby requirements.