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L6986H Datasheet(PDF) 17 Page - STMicroelectronics

Part # L6986H
Description  38 V, 2 A synchronous step-down switching regulator with 30 μA quiescent current
PDF  68 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6986H Datasheet(HTML) 17 Page - STMicroelectronics

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4.3.1
Ratiometric startup
The ratiometric start-up is implemented sharing the same soft-start capacitor for a set of the L6986H 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=nL6986H⋅SSGAIN⋅ISSCH⋅TSS
VFB =nL6986H⋅3⋅4μA⋅TSS
0.85V
(12)
where nL6986H 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 start-up operation
L6986H
Soft-start and inhibit
DS12905 - Rev 2
page 17/68



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