L6986H datasheet(23/68 Pages) STMICROELECTRONICS

部件名	L6986H

功能描述	38 V, 2 A synchronous step-down switching regulator with 30 μA quiescent current

PDF	68 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

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23 / 68 page

Figure 18. Light-load efficiency comparison at different ISKIP - linear scale

0.2

0.4

0.6

0.8

1.2

1.4

1.6

1.8

ILOAD [A]

VIN=13.5 V; VOUT=3.3V; fsw=500kH z

LNM - SWO

LCM_ISKIPH - SWO

LCM_ISKIPL - SWO

LCM ISKIPH=600mA

LCM ISKIPL=200mA

LNM

Figure 19. Light-load efficiency comparison at different ISKIP - log scale

100

ILOAD [A]

VIN=13.5V; VOUT=3.3 V; fsw=5 00kH z

LNM - SWO

LCM_ISKIPH - SWO

LCM_ISKIPL - SWO

LCM ISKIPH=600mA

LCM ISKIPL=200mA

LNM

Figure 20. LCM operation with ISKIPH = 600 mA typ. at zero load and Figure 21. LCM operation with ISKIPL =

200 mA typ. at zero load show the LCM operation at the different ISKIP level.

Figure 20. LCM operation with ISKIPH = 600 mA typ. at zero load shows the ISKIPH = 600 mA typ. and so 50 mV

output voltage ripple.

Figure 21. LCM operation with ISKIPL = 200 mA typ. at zero load shows the ISKIPL = 200 mA typ. and so less

than 20 mV output voltage ripple.

L6986H

Light-load operation

DS12905 - Rev 2

page 23/68

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