L6460 datasheet(40/139 Pages) STMICROELECTRONICS

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Start-up configurations

L6460

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Doc ID 17713 Rev 1

8.2

Basic device mode

The basic device mode is selected by leaving the GPIO[0] pin floating. In this mode L6460

doesn’t use GPIO[3] and GPIO[4] as configuration pins, leaving them free for other uses.

When in this mode the regulators included in the start up sequence (except VSWmain) are

considered as system regulators and they start in the following sequence:

Auxiliary switching regulator1 (VAUX1_SW).

Auxiliary switching regulator2 (VAUX2_SW).

Main linear regulator (VSWmain).

Main switching regulator (VSWmain) (Not system regulator).

Table 9.

Start-up correspondence

Pin state(1)

“X” means “don’t care”.

Major mode

Minor mode(2)

The description of these modes is in the following Chapter 8.6

GPIO[0]

GPIO[3]

GPIO[4]

Basic

000

Single

Bridge

Primary regulator

001

Regulators

Simple regulator

Bridge + VEXT (3)

VEXT is the regulator output voltage obtained using the switching regulator controller with external FET.

Secondary regulators

010

Master

Bridge

Primary regulator

011

Regulators

Simple regulator

Bridge + VEXT (3)

Secondary regulators

1Z0

Slave

Bridge

Primary regulator

Regulators

Simple regulator

Bridge + VEXT (3)

Secondary regulators.

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