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A6986H Datasheet(PDF) 19 Page - STMicroelectronics

Part # A6986H
Description  Automotive 38 V, 2 A synchronous step-down switching regulator with 30 μA
PDF  71 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A6986H Datasheet(HTML) 19 Page - STMicroelectronics

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5.3.1
Ratiometric startup
The ratiometric start-up is implemented sharing the same soft-start capacitor for a set of the A6986H devices
Figure 10. Ratiometric startup
VOUT3
VOUT2
VOUT1
t
V
As a consequence all the internal current generators charge in parallel the external capacitor. The capacitor value
is dimensioned accordingly, as per equation below:
CSS=nA6986H⋅SSGAIN⋅ISSCH⋅TSS
VFB =nA6986H⋅3⋅4μA⋅TSS
0.85V
(12)
where nA6986H represents the number of devices connected in parallel.
For better tracking of the different output voltages the synchronization of the set of regulators is suggested.
Figure 11. Ratiometric startup operation
A6986H
Soft-start and inhibit
DS12861 - Rev 3
page 19/71



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