| Citation: |
Guo Zhongjie, Wu Longsheng, Liu Youbao, Zhang Qian. A novel embedded soft-start circuit for SOC power supply[J]. Journal of Semiconductors, 2010, 31(5): 055012. doi: 10.1088/1674-4926/31/5/055012
Guo Z J, Wu L S, Liu Y B, Zhang Q. A novel embedded soft-start circuit for SOC power supply[J]. J. Semicond., 2010, 31(5): 055012. doi: 10.1088/1674-4926/31/5/055012.
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A novel embedded soft-start circuit for SOC power supply
doi: 10.1088/1674-4926/31/5/055012
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Abstract
To improve the power sequencing performance of the system-on-a-chip (SOC), a novel embedded soft-start circuit is presented. A seamless soft-start reference voltage is obtained with 7 bits DAC, which can not only restrain the turning point overshoot, but also improve the output accuracy and the poor loading capability, reduce the pin number and save PCB area. The whole DC–DC converter has been fabricated in a 0.35 μm CMOS process. The measurement results show that the chip starts up successfully with 250 μs soft-start time under conditions of 400 kHz switching frequency, 2.5 V DC–DC output and 1.8 V LDO output. Stable operation after soft-start is also shown.-
Keywords:
- SOC,
- current mode converter,
- soft-start,
- loading capability
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References
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