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A novel charge pump with variable frequency modulation (VFM) is proposed in this paper. To provide base for its design and improvement, detailed models for VFM charge pump are derived. And it is successfully implemented for the charge pump to introduce a voltage controlled oscillator (VCO) to control the switching frequency, which results in its high efficiency and low ripple output both at high load...
In order to increase the efficiency of portable devices powered by lithium-ion battery, a high efficiency multi-mode buck-boost controller IC is proposed in this paper. By applying a cascade buck-boost prototype, it not only realizes seamless transition between step up and down functions, but also achieves high efficiency over the entire load range by introducing BURST mode operation. System design...
Current-sharing techniques used in low- voltage high-current multi-phase voltage regulator module (VRM) were analyzed and discussed in detail. Analyzing the advantages and disadvantages of the current mode and voltage mode current sharing techniques respectively, a novel approach was proposed, which possess advantage of desired output voltage and supply voltage. A complete analysis and design method...
A four-stage BiCMOS operational amplifier with a quiescent current-controlled class AB output stage was presented. Double nested Miller compensation was taken to improve the stability. Either single or double power supplies were available for the amplifier and the voltage could be as low as 2 V. The quiescent output current under 5 V supply voltage was about 8 muA. With a load of 60 pF and 25 kOmega,...
To solve uneven distribution of load currents and thermal stresses among the paralleled power modules, a load share controller IC was proposed. By using the automatic master-slave control and the startup and adjustment control strategy, load current sharing among the paralleled modules was achieved. In addition, under-voltage detecting, load share bus short circuit prevention and fault protection...
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