ACT41000-103 datasheet(25/72 Pages) QORVO

25 / 72 page

ACT41000

Programmable Voltage, Programmable Current, Low Noise

RFPoL Step-Down Voltage Regulator

Under-Voltage Lock-Out

The Under-Voltage Lock-Out (UVLO) function prevents the ACT41000 device working under too low input voltage at the VIN

pin. As the VIN pin is connected to the PVIN pin on a PCB, the UVLO monitors PVIN too.

When the VIN pin voltage is below the VIT(UVLO) threshold, the device disables all the functions but this UVLO circuit. During

this UVLO period, the device minimizes power consumption and wait for the VIN pin voltage rises into a valid range.

When the VIN pin voltage exceeds the VIT(UVLO) threshold, the device starts working, by following the Control Logic

state-machine. Once the UVLO released, the device keeps working as long as VIN pin voltage maintains higher than the

VIT(UVLO,fall) threshold that has a hysteresis from the VIT(UVLO) value.

Over-Voltage Lock-Out

The Over-Voltage Lock-Out (OVLO) function prevents the ACT41000 device working from too high input voltage at the VIN

pin. As the VIN pin is connected to the PVIN pin on a PCB, the OVLO monitors PVIN too.

When the VIN pin voltage exceeds the VIT(OVLO) threshold, the device disables all the functions but this OVLO circuit. During

this OVLO period, the device minimizes power consumption and wait for the VIN pin voltage decrease back into a valid

range.

When the VIN pin voltage gets back normal (under VIT(OVLO,fall)), the device starts working, by following the Control Logic.

The Reg01[0] bit is set logic-H to indicate this error.

This OVLO does not protect the device from any potential damage caused by over-voltage events.

See Note of Absolute Maximum Rating.

The OVLO is only intended to reduce a risk of a chain-reaction that the VIN/PVIN over-voltage event triggers

by disabling all output rails of the device.

Factory Programmed ROM

The ACT41000 integrates a read-only memory (ROM) block and that is programmed at its factory test. The data contents of

the ROM configure various behaviors of the device and also some of the contents are default values of I

2C registers. When

the Under-Voltage Lock-Out released, the Control Logic state-machine activates the ROM block as its first step and the

STM configures itself according to the ROM values.

See Factory Programming Options.

BIAS Blocks

The ACT41000 employs several bias voltage and bias current reference circuits those are necessary to maintain proper

operations of regulator blocks. When the Under-Voltage Lock-Out released, the Control Logic state-machine activates these

reference and bias circuits before starting the Mini-buck Regulator.

ACT41000 Data Sheet, Rev. B, 01-Apr-2022

Subject to change without notice

ACT41000-103 Datasheet(PDF) 25 Page - Qorvo, Inc