ACT2861 datasheet(26/97 Pages) QORVO

26 / 97 page

Data Sheet Rev. F, April 2022 | Subject to change without notice

26 of 97

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ACT2861

30V Buck-Boost Charger with Integrated MOSFETs and OTG

Figure 5: OTG State Machine Diagram

back to the reset state and disable the converter. Dur-

ing this state, the converter can be disabled with a light

load condition. Additionally, if the output drops below

VOTG_UVP (3.0V), the IC will go into a hiccup mode to pro-

tect the output in a shorted condition.

OTG Light Load Disable State (OTG_LL_DIS)

In the state, the converter is disabled to minimize load

on the battery. It prevents the converter from switching

with no load.

The state machine enters OTG_LL_DIS when it senses

a light load for longer than the light load time out time.

This time is set by I2C bit OTG_OFF_DLY[1:0] in regis-

ter 0x0Eh. Note that the converter only enters

OTG_LL_DIS when operating in buck mode. It does not

enter OTG_LL_DIS when in boost or buck-boost mode.

The state machine can only exit OTG_LL_DIS when the

IC exits the OTG Mode by the nOTG pin or HIZ register.

OTG Hiccup / Vout Fault State (OTG_HICCUP)

This state is a fault state that minimizes overall IC power

dissipation in extreme output overload conditions.

The state machine enters this state when the OTG out-

put cannot support the load. When the OTG output

reaches the maximum programmed output current, it

clamps the current and the voltage starts to drop. If the

load increases, the output voltage drops even further. If

it drops below VOTG_UVP (3.0V), the converter is disabled

for 3s. After 3s, it automatically moves to OTG_RST and

restarts. If there is a fault on the output, this cycle con-

tinues until the fault is removed.

ACT2861 Datasheet(PDF) 26 Page - Qorvo, Inc