SEMICONDUCTOR INTEGRATED CIRCUITS
Abstract: A 1500 mA,10 MHz self-adaptive on-time (SOT) controlled buck DC-DC converter is presented. Both a low-cost ripple compensation scheme (RCS) and a self-adaptive on-time generator (SAOTG) are proposed to solve the system stability and frequency variation problem. Meanwhile a self-adaptive power transistor sizing (SAPTS) technique is used to optimize the efficiency especially with a heavy load. The circuit is implemented in a 2P4M 0.35 μ m CMOS process. A small external inductor of 0.47 μ H and a capacitor of 4.7 μ F are used to lower the cost of the converter and keep the output ripple to less than 10 mV. The measurement results show that the overshoot of the load transient response is 8 mV @ 200 mA step and the dynamic voltage scaling (DVS) performance is a rise of 16 μ s/V and a fall of 20 μ s/V. With a SAPTS technique and PFM control, the efficiency is maintained at more than 81% for a load range of 20 to 1500 mA and the peak efficiency reaches 88.43%.
Key words: buck converter
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Received: 20 August 2015 Revised: 22 June 2011 Online: Published: 01 January 2012
| Citation: |
Yu Jiale, Lü Danzhu, Hong Zhiliang. A 1500 mA, 10 MHz on-time controlled buck converter with ripple compensation and efficiency optimization[J]. Journal of Semiconductors, 2012, 33(1): 015002. doi: 10.1088/1674-4926/33/1/015002
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Yu J L, Lü D, Hong Z L. A 1500 mA, 10 MHz on-time controlled buck converter with ripple compensation and efficiency optimization[J]. J. Semicond., 2012, 33(1): 015002. doi: 10.1088/1674-4926/33/1/015002.
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