The LM53600-Q1 and LM53601-Q1 devices run in current mode and has internal compensation. This compensation is stable with inductance between 4 µH and 10 µH. For most applications, 4.7 µH should be used with fixed 5-V and 3.3-V versions of the LM53600-Q1 and LM53601-Q1 devices. The output inductor is limited by current ripple while operating at high input voltage to a minimum rating of 4.7 µH for 3.3 V and 5-V fixed output devices. Since adjustable devices operate at the same frequency under high input voltage conditions as devices set to deliver 3.3 V, inductor current ripple at high input voltages can become excessive while using a 4.7µH while using an adjustable device that is delivering output voltage above 4.2 V. 6.8 µH is recommended if an adjustable device is used to produce output voltage above 4.2 V. Not exceeding 6.8 µH is recommended since use of large inductance causes poor transient load response. For the LM53601-Q1 (1-A output), a saturation rating of about 2 A is recommended since this is the maximum current limit rating. Likewise, a saturation current rating of about 1.5 A is recommended for the LM53600-Q1. See IL_HS in the data sheet.
|PART TYPE||RECOMMENDED INDUCTANCE RATING(1)||RECOMMENDED MINIMUM SATURATION CURRENT(2)||COMMENT|
|LM53601-Q1 3.3 V and 5 V||4.7 µH||about 2 A||6.8 µH works in systems with less demanding transient load requirements|
|LM53601-Q1 ADJ set to ≤ 4.2-V output||4.7 µH||about 2 A|
|LM53601-Q1 ADJ set to > 4.2-V output||6.8 µH||about 2 A|
|LM53600-Q1 3.3 V and 5 V||4.7 µH||about 1.5 A||Up to 10 µH works in systems with less demanding transient load requirements|
|LM53600-Q1 ADJ set to ≤ 4.2-V output||4.7 µH||about 1.5 A|
|LM53600-Q1 ADJ set to > 4.2-V output||6.8 µH||about 1.5 A|