The LM76005 is in active mode when the EN pin
and UVLO high threshold levels are satisfied. The simplest way to enable the
operation of the LM76005 is to connect the EN pin to VIN, which allows self start-up of
the LM76005 when the input voltage is in the operation range: 3.5 V to 60
V. See Section 7.3.4 for details on setting these operating levels.
In active mode, depending on the load current, the LM76005 will be in one of five sub modes:
- CCM with fixed switching frequency with load between half of IMINPK to full load
- DCM when the load current is lower than half of the inductor current ripple
- Light load mode where the device uses pulse frequency modulation (PFM) and lowers the switching frequency at load under half of IPEAK_MIN to improve efficiency
- Foldback mode when switching frequency is reduced to maintain output regulation with supply voltages that cause the minimum tON or tOFF to be exceeded
- Forced-pulse-width modulation (FPWM) is similar to CCM with fixed switching frequency, but extends the fixed frequency range of operation from full to no load.