It's a cordova/phonegap plugin to send your app to background by starting Home activity. Tested on cordova 4.1.2 .
cordova plugin add https://github.com/darkgeek/Phonegap-BackHome-Plugin.git
This plugin provides one method called goHome(successCallback, errorCallback) to start Home activity.
window.BackHome.goHome(successCallback, errorCallback);
Originally developed by Dpa99c in stackoverflow, and updated by me to make it work with cordova 4.0 and later.