SABRE-LL-I datasheet(30/141 Pages) STMICROELECTRONICS

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Start-up configurations

SABRE-LL-I

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When in this mode the power-up sequence is:

Auxiliary switching regulator1 (VAUX1_SW).

Main switching regulator (VMAIN_SW) together with main linear regulator (VMAIN_LIN).

Auxiliary switching regulator2 (VAUX2_SW) (Not system regulator).

8.7.3

Regulators mode

In this configuration bridge 4 can be configured by firmware while bridge 3 is configured as

two separate synchronous switching regulators, but the start up sequence is different

previous one.

When in this mode the power-up sequence is:

Main switching regulator (VMAIN_SW).

Auxiliary switching regulator1 (VAUX1_SW)

Auxiliary switching regulator2 (VAUX2_SW)

8.7.4

Simple regulator mode (KT)

Also in this configuration Bridge 4 can be configured by firmware while Bridge3 is configured

as two separate synchronous switching regulators. The last regulator in the sequence

(VMAIN_SW).is not considered a system regulator.

When in this mode the power-up sequence is:

Auxiliary switching regulator1 (VAUX1_SW).

Auxiliary switching regulator2 (VAUX2_SW)

Main linear regulator (VMAIN_LIN)

Main switching regulator (VMAIN_SW) (not system regulator).

8.7.5

Bridge+ VEXT mode

In this configuration bridges 3 and 4 are not used as regulators and the regulator obtained

using the switching regulator controller (VEXT) is included in start-up.

When in this mode the power-up sequence is:

Main switching regulator (VMAIN_SW).

Switching regulator controller regulator (VEXT).

Main linear regulator (VMAIN_LIN).

8.7.6

Secondary regulators mode

In this configuration, bridge 3 is configured as a single synchronous switching regulator

using its two half bridges in parallel (VAUX_(1//2)SW).

When in this mode the power-up sequence is:

Main switching regulator (VMAIN_SW).

Auxiliary switching regulator (VAUX(1//2)_SW).

Main linear regulator (VMAIN_LIN).

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