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ACT2861QI Datenblatt(PDF) 29 Page - Active-Semi, Inc

Teilenummer ACT2861QI
Bauteilbeschribung  30V Buck-Boost Charger with Integrated MOSFETs and OTG
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Hersteller  ACTIVE-SEMI [Active-Semi, Inc]
Direct Link  http://www.active-semi.com
Logo ACTIVE-SEMI - Active-Semi, Inc

ACT2861QI Datenblatt(HTML) 29 Page - Active-Semi, Inc

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ACT2861QI
Rev 2.0, 27-Apr-2018
Innovative PowerTM
www.active-semi.com
ActiveSwitcherTM is a trademark of Active-Semi
Copyright © 2018 Active-Semi, Inc.
29
BUCK-BOOST OPERATION
The ACT2861 is a monolithic buck-boost charger with
On-The-Go (OTG). As a result, it can operate in both
charge mode and OTG mode. In charge mode, the IC
converts power from VIN to VBAT to charge a 2S to 5S
battery. In OTG mode, it converts power from the bat-
tery to VIN to provide a regulated output voltage. Four
internal, low resistance, NMOS switches minimize the
application circuit size and reduce power losses to max-
imize efficiency. Internal high side gate drivers, which
require only two small external capacitors, further sim-
plify the design process. An advanced switch control al-
gorithm allows the buck-boost converter to maintain
charge or OTG output voltage regulation with input volt-
ages that are above, equal to, or below the regulated
output voltage. The ACT2861 automatically transitions
between these three operating modes, depending on
the input to output voltage ratios.
Power Stage
Figure 6 shows the 4-switch, buck-boost power stage.
The converter operates with current mode control. The
internal control algorithm reconfigures the IC between a
buck, a boost, and a buck-boost topology as needed.
This reduces power dissipation and maximizes effi-
ciency because only two FETs switch when in it oper-
ates in buck or boost mode. Table 2 shows the switch
configuration in each topology. Note that this table is
valid for Charge mode. In OTG mode, power flows in
the opposite direction, so the switching modes are re-
versed. The voltage transition between buck to buck-
boost and from buck-boost to boost modes is set by I2C
bits XOVER_ADJ_BUCK and XOVER_ADJ_BOOST.
With a fixed input voltage and an increasing battery volt-
age, the IC switches from buck mode to buck-boost
mode when VIN – VBAT < XOVER_AJD_BUCK, which
is typically 1V. It switches from buck-boost to boost
mode when VBAT – VIN > XOVER_ADJ_BOOST,
which is typically 2V. These values are set at the factory
to optimize efficiency and performance for each CMI.
The power stage is bi-directional and provides power in
both directions. When charging, power flows from VIN
to VBAT. In OTG mode, power flows from VBAT to VIN.
Q1-Q4 are all internal, N-ch MOSFETs to minimize size
and maximize efficiency.
VIN
Q1
Q2
Q3
Q4
VBAT
L
SW1
SW2
Figure 6: 4-Switch Buck-Boost Power Stage
Table 2: Buck-Boost Switch Configuration
CHARGE MODE
BUCK
BUCK-
BOOST
BOOST
Q1
SWITCHING
SWITCHING
ON
Q2
SWITCHING
SWITCHING
OFF
Q3
OFF
SWITCHING
SWITCHING
Q4
ON
SWITCHING
SWITCHING
Figure 7 shows the power stage operating modes. A
typical example of how the converter switches between
modes can be explained with an example using a 15V
input source to charge a 4S Li-Ion battery. When fully
discharged, the battery voltage is 12V. With VIN=15V
and VBAT=12V, the control loop operates in Buck mode
at point A. As the battery charges, the operating mode
maintains buck mode until it crosses the threshold be-
tween buck mode and buck-boost mode. When the bat-
teries are charged at 15V, the control loop operates at
point B in Buck-Boost mode. The 4S battery reaches
charge termination voltage at 17.4V. In this case, the
control loop operates at point C, which is still Buck-
Boost mode. If the input voltage dropped from 15V to
12V, the control loop will move to point D and operate
in Boost mode.


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