Datasheet

Functional description L5987
16/41 Doc ID 14972 Rev 3
With V
IN
= 3.3 V, V
OUT
= 1.8 V, I
O
= 2.7 A, R
DS(on)
= 220 mΩ, V
F
= 0.35 V and DCR = 30 mΩ,
the duty is D = 73%, so the maximum DC output current results 2.926 A, higher than the
desired current.
Figure 9. Maximum DC output current for VQFN package vs duty cycle
Note: For duty cycles lower than 69%, the RMS current does not limit the maximum DC output
current of 3 A. For duty cycles higher than the 69% the maximum DC output current is
limited by the RMS current (see Equation 5)