F72830 Datasheet, PDF (11/23 Pages) Feature Integration Technology Inc. – Four-Phase Linear Controller with I2C Interface

Fintek
Feature Integration Technology Inc.
F72830
7 Simplified External Application Diagram
PWR
SDA
SCL
I2C &
ACPI Control
LR1
LR
LR2
LR
Controllers
Application
circuit
LR3
LR4
Figure3. F72830 external application diagram
8 Functional Description
8.1 _{Linear Controller Description}
The F72830 contains 4 sets of linear controllers. When the chip is powered on, soft-start will be active. Then, the
first linear controller will generate the output voltage. The other 3 sets of linear controllers, LR_2, LR_3, and LR_4
are controlled by the corresponding enable pin, EN2, EN3, and EN4. There is no priorities in linear controllers 2~4.
The output voltage sequence of linear controllers 2~4 issued depends on enable signal of EN2~4 sequence only. If
any enable pin acts high before or at the same time as VDDA PWROK, the corresponding linear controller will
generate output as linear controller 1 simultaneously. When the enable pin receives enable signal, soft-start and
enable status checking will be active. To receive first coming high signal from any enable pin then soft-start will
start. Before the duration of soft-start reaching 0.1V, any successive acting high enable signal is considered in the
same soft-start sequence. All of the linear regulators corresponding to high acting enable pins will generate output
following soft-start procedure. If the successive enable signal is received out of the bound of the duration, the
enable sequence will be arranged after this period of soft-start finishes. The detail can be referred in Figure4.
10
2007 V0.14P