Integrated CMOS DC-DC converter implementation in...

Details Integrated CMOS DC-DC converter implementation in... Integrated CMOS DC-DC converter implementation in...

2007-07-20

2010-06-01

Tso, Edward (Department: 2858)

Electricity: battery or capacitor charging or discharging

Cell or battery charger structure

C323S266000, C323S282000

Reexamination Certificate

active

07728550

ABSTRACT:
An electrical circuit and method of power management of a cellular telephone includes a battery adapted to produce a battery voltage; a LDO regulator operatively connected to the battery and adapted to provide a constant supply voltage from the battery voltage; and a DC-DC converter operatively connected to the LDO regulator, wherein the DC-DC converter is adapted to step down the constant supply voltage to a lower voltage level, wherein the LDO regulator and the DC-DC converter are embedded on a single integrated circuit chip. The constant supply voltage equals 3.6V at an output of the LDO, and the constant supply voltage is applied to an input of the DC-DC converter. Moreover, the battery voltage equals at most 5.5V.

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S. Reynolds, “A DC-DC Converter for Short-Channel CMOS Technologies,” IEEE Journal of Solid-State Circuits, vol. 32, No. 1, Jan. 1997, pp. 111-113.

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