A6986H datasheet(24/71 Pages) STMICROELECTRONICS

номер детали	A6986H

подробное описание детали	Automotive 38 V, 2 A synchronous step-down switching regulator with 30 μA

PDF	71 Pages

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производитель	STMICROELECTRONICS [STMicroelectronics]

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When the A6986H is configured in the low consumption mode, the SYNCH/ISKIP pin operates as a logic gate

input pin with an internal pull-down (4.5 µA typ.) guaranteeing the ISKIPH operation when leaving the pin floating.

Table 12. SYNCH/ISKIP pin voltage thresholds and driving current reports the VSYNCH/ISKIP thresholds and the

minimum current needed to drive the pin.

Table 12. SYNCH/ISKIP pin voltage thresholds and driving current

Parameter

Value

VSKIP_TH_L_MAX

0.65 V

VSKIP_TH_H_MIN

1.6 V

ISYNCH/ISKIP_DRIVING_MIN

± 10 µA

Figure 17. A6986H skip current level transition at ILOAD = 150 mA with L = 10 µH shows a skip current threshold

transition at ILOAD = 150 mA measured on the A6986H - VOUT = 3.3 V with fsw = 500 kHz and L = 10 µH:

•

When V(SYNCH/ISKIP) < VSKIP_TH_L_MAX, the A6986H operates in the pulse skipping mode minimizing

current consumption

•

When V(SYNCH/ISKIP) > VSKIP_TH_H_MIN, the A6986H operates in the continuous conduction mode

minimizing the output voltage ripple

Figure 17. A6986H skip current level transition at ILOAD = 150 mA with L = 10 µH

Figure 18. Light-load efficiency comparison at different ISKIP - linear scale and Figure 19. Light-load efficiency

comparison at different ISKIP - log scale report the efficiency measurements to highlight the ISKIPH and ISKIPL

efficiency gap at the light-load also in comparison with the LNM operation. The same efficiency at the medium /

high load is confirmed at different ISKIP levels.

A6986H

Light-load operation

DS12861 - Rev 3

page 24/71

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