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L6981 Datasheet(PDF) 36 Page - STMicroelectronics

Part # L6981
Description  38 V, 1.5 A synchronous step-down converter with low quiescent current
PDF  49 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6981 Datasheet(HTML) 36 Page - STMicroelectronics

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Figure 41. Power losses VIN = 24 V; VOUT = 3.3 V; FSW = 0.4 MHz
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1.5
IOUT [A]
VIN = 24 [V]; VOUT = 3.3 [V]; FSW = 0.4 [MHz]
LCM
LNM
POUT
The following three figures show the efficiency and power losses acquired on the standard evaluation board of the
device, selecting the following output filter:
•
COUT:
–
1 x GRJ32EC71E226KE11 22 µF 16 V (Murata)
–
1 x C3216X7R1H106K160AC 10 µF 50 V (TDK)
•
Inductor:
–
MSS1038T-223ML (Coilcraft)
•
C8:
–
10 pF
Figure 42. Efficiency VIN = 12 V; VOUT = 3.3 V; FSW = 0.4 MHz
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IOUT [A]
V IN = 12 [V]; VOUT = 3.3[V]; FSW = 0.4[MHz]
LCM
LNM
L6981
Efficiency curves
DS13554 - Rev 1
page 36/49



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