A single-inductor switching DC-DC converter with five outputs and ordered power-distributive control
- Author(s): Le, Hanh-Phuc
- Chae, Chang-Seok
- Lee, Kwang-Chan
- Wang, Se-Won
- Cho, Gyu-Ha
- Cho, Gyu-Hyeong
- et al.
Published Web Locationhttp://ieeexplore.ieee.org/iel5/4/4381435/04381453.pdf?tp=&arnumber=4381453&isnumber=4381435
An integrated five-output single-inductor multiple-output dc-dc converter with ordered power-distributive control (OPDC) in a 0.5 mu m Bi-CMOS process is presented. The converter has four main positive boost outputs programmable from +5 V to +12 V and one dependent negative output ranged from -12 V to -5 V. A maximum efficiency of 80.8% is achieved at a total output power of 450 mW, with a switching frequency of 700 kHz. The performance of the converter as a commercial product is successfully verified with a new control method and proposed circuits, including a full-waveform inductor-current sensing circuit, a variation-free frequency generator, and an in-rush-current-free soft-start method. With simplicity, flexibility, and reliability, the design enables shorter time-to-market in future extensions with more outputs and different operation requirements.
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