LMZ22005

SNVS686J – MARCH 2011 – REVISED AUGUST 2015

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7.4 Device Functional Modes

7.4.1 Discontinuous And Continuous Conduction Modes

At light load the regulator will operate in discontinuous conduction mode (DCM). With load currents above the

critical conduction point, it will operate in continuous conduction mode (CCM). In CCM, current flows through the

inductor through the entire switching cycle and never falls to zero during the OFF-time. When operating in DCM,

the emulated current mode control method used. Output voltage ripple typically increases during this mode of

operation.

Figure 45 is a comparison pair of waveforms of the showing both CCM (upper) and DCM operating modes.

Figure 45. CCM and DCM Operating Modes

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