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L6981 Datasheet(PDF) 15 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) 15 Page - STMicroelectronics

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6.4.3
Efficiency for Low consumption mode and Low noise mode part number
Figure 14 and Figure 15 report the efficiency measurements to highlight the gap at the light-load between LNM
and LCM part numbers. The graph reports also the same efficiency at the medium / high load.
Figure 14. Light-load efficiency for low consumption mode and low noise mode - linear scale
0
10
20
30
40
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60
70
80
90
100
0
0.2
0.4
0.6
0.8
1
1.2
1.4
IOUT [A]
LCM
LNM
VIN = 24 [V]; VOUT = 5 [V]; FSW = 400 [ KHz ]
Figure 15. Light-load efficiency for low consumption mode and low noise mode - log scale
0
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0.0001
0.001
0.01
0.1
1
IOUT [A]
VIN = 24 [V]; VOUT = 5 [V]; FSW = 400 [KHz]
LCM
LNM
L6981
Light-load operation
DS13554 - Rev 1
page 15/49



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