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On-chip CMOS current-sensing circuit for DC-DC buck converter

On-chip CMOS current-sensing circuit for DC-DC buck converter

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© The Institution of Engineering and Technology
Published

An on-chip CMOS current-sensing circuit for a DC-DC buck converter is presented. The circuit can measure the inductor current through sensing the voltage of the switch node during the converter on-state. By matching the MOSFETs, the achieved sense ratio is almost independent of temperature, model and supply voltage. The proposed circuit is suitable for low power DC-DC applications with high load current.

Inspec keywords: CMOS integrated circuits; electric sensing devices; electric current measurement; power MOSFET; DC-DC power convertors; inductors; integrated circuit measurement

Other keywords: DC-DC buck converter; on-chip CMOS current-sensing circuit; inductor current measurement; converter on-state; switch node voltage sensing; MOSFET

Subjects: Power electronics, supply and supervisory circuits; CMOS integrated circuits; Current measurement; Sensing devices and transducers; Power semiconductor devices; Insulated gate field effect transistors

References

    1. 1)
      • F.L. Cheung , P.K.T. Mok. . A monolithic current-mode CMOS DC-DC converter with on-chip current-sensing technique. IEEE J. Solid-State Circuits , 1 , 3 - 14
    2. 2)
      • Linda, N.: `Analysis of lossless current sensing techniques with high accuracy and linearity', Proc. 2007 Int. Conf. Communication Circuits and Systems, Fukuoka, July 2007, Japan, p. 1021–1024.
    3. 3)
    4. 4)
    5. 5)
    6. 6)
      • Hassan, P.F., Gabriel, A.R.M.: `Current-sensing techniques for DC-DC converters', 45thMidwest Symp. Circuits and Systems, August 2002, Tulsa, OK, USA, p. 577–580.
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