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L5987 データシート(PDF) 16 Page - STMicroelectronics

部品番号 L5987
部品情報  3 A step-down switching regulator
PDF  42 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5987 データシート(HTML) 16 Page - STMicroelectronics

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Functional description
L5987 - L5987A
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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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