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Single Boost converter has several limitations in driving a long LED string although it can have perfect current match between each LED. Extreme duty cycle and low efficiency are the two major drawbacks. In this paper, a high efficiency step-up DC-DC converter with high voltage gain for LED backlighting applications is proposed. Without using a transformer, a multi-modes charge-pump is cascaded with...
A high efficiency charge-pump based wide input range DC-DC converter is proposed. The first stage is a multi-modes charge-pump and the second stage is a synchronous buck converter. The charge-pump is unregulated and adaptively switches between 1x, 0.5x, and 0.33x modes according to input voltage. It does the rough voltage conversion while buck converter does the fine voltage regulation. As they exhibit...
A hybrid control scheme of a regulated multi-modes charge pump and its modeling are proposed in this paper. It can achieve very high efficiency over wide input and load range. It is controlled to adaptively change the conversion mode at different input voltage. It also combines device segmentation and pulse skipping modulation to improve the efficiency over a wide load range. Due to the complexity...
A multi-modes regulated charge pump with improved efficiency over wide input and load range is proposed in this paper. The output voltage is regulated to 5 V when input is 4.5-2.7 V. By alternating the switch network, it can realize 2x, 1.5x, and 1.33x conversion modes, which improves the efficiency over wide input range. During each mode, the output voltage is regulated by a controlled current source...
The design of a 1 MHz regulated multi mode charge pump using IBM7RF technology is described in this paper. This charge pump converts 2.7-4.5 V input voltage to a regulated 5 V output. The power stage includes nine PMOS switches and one NMOS acting as a controlled current source with 50% duty cycle. Together with three flying capacitors and the output capacitors, the converter can work in 2??, (3/2)??...
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