Patent ID: 9276428
Filing Date: 2016-03-01
CPC Classification: H02J,H02M

Claim Text:
1. A management circuit for a portable device, comprising: an input terminal coupled to receive a supply voltage from an energy source; a first step-up converter, coupled to the input terminal, for selectively converting the supply voltage to a first boosted voltage; a second step-up converter, coupled to the input terminal, for selectively converting the supply voltage to a second boosted voltage; a first step-down converter, coupled to the first step-up converter, for selectively providing a first output power voltage to a first radio frequency (RF) module; a second step-down converter, coupled to the first step-up converter, for selectively providing a second output power voltage to a second radio frequency (RF) module; wherein the first step-up converter performs the conversion of the supply voltage when the supply voltage is under a threshold voltage; a high voltage electric load with a first operation voltage; a low voltage electric load with a second operation voltage; a high voltage low dropout regulator, coupled to the second step-up converter and the high voltage electric load, for regulating the second boosted voltage to provide a high output voltage as the first operation voltage of the high voltage electric load; and a low voltage low dropout regulator connected to the energy source without any intervening components, for regulating the supply voltage to provide a low output voltage as the second operation voltage.