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L5987 Datasheet(PDF) 16 Page - STMicroelectronics

Part # L5987
Description  3 A step-down switching regulator
PDF  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5987 Datasheet(HTML) 16 Page - STMicroelectronics

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Functional description
L5987 - L5987A
16/42
With VIN = 3.3 V, VOUT = 1.8 V, IO = 2.7 A, RDS(on) = 220 mΩ, VF = 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 8.
Maximum DC output current for VQFN package vs duty cycle. 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)



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