ACT5101 datasheet(13/59 Pages) QORVO

13 / 59 page

Data Sheet Rev. E, November 2019 | Subject to change without notice

13 of 59

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ACT510x

23V Buck-Boost Converter with Integrated MOSFETs

When modifying only certain bits within a register, take

care to not inadvertently change other bits. Inadvert-

ently changing register contents can lead to unexpected

IC behavior.

STATE MACHINE

ACT510x contains an internal state machine with three

internal states: RESET, HIZ, and POWER ON.

RESET State

The IC enters the RESET state when power is applied.

All registers are reset to their default values. I2C is not

functional in RESET. The IC transitions to the HIZ state

when VIN goes above 3.9V

HIZ State

HIZ mode is a low power state with the switching

converter disabled. In this mode, I2C is active and the

IC configuration can be changed. The IC enters HIZ

from RESET and then either stays in HIZ or transitions

to the POWER ON state. Note that the HIZ Register

overrides the EN pin settings and may hold the IC in HIZ

mode. See the HIZ section for more details.

POWER ON State

In the POWER ON state, the ACT510x transfers power

from VIN to VOUT to provide a regulated output voltage.

The IC enters this state with the EN pin or the

EN_OVERRIDE register. Once in POWER ON, the IC

follows the separate POWER ON State Machine. See

the POWER ON State machine for more details.

Figure 3: Operating Modes State Machine

POWER ON STATE MACHINE

The ACT510x has a dedicated POWER ON state

machine. This state machine handles the startup, nor-

mal operation and fault conditions.

Reset State (RST)

The POWER ON state machine always starts from the

RST state. All converter operation starts from this state.

In this state, the switcher is disabled and the state

machine is waiting for all the required conditions to

move to the SS state.

HIZ

Converter=DISABLED

VREG=VREG_DIS REG

POWER ON

Converter=ENABLED

VREG=VREG_DIS REG

RESET

Input Power applied and

all registers reset to

defaults

HIZ Reg=0

AND

EN Reg=1

AND

( EN Pin = HI OR EN_OVERRIDE Reg=1 )

HIZ Reg=1

EN Reg=0

(EN Pin = LOW AND EN_OVERRIDE Reg=0)

(VOUT_OV AND 100ms)

(VIN Pin <1V AND VOUT Pin<1V)

VIN Pin > 3.9V

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