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ACT2861QI 数据表(PDF) 35 Page - Active-Semi, Inc

部件名 ACT2861QI
功能描述  30V Buck-Boost Charger with Integrated MOSFETs and OTG
Download  91 Pages
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制造商  ACTIVE-SEMI [Active-Semi, Inc]
网页  http://www.active-semi.com
标志 ACTIVE-SEMI - Active-Semi, Inc

ACT2861QI 数据表(HTML) 35 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.
35
Battery Charging Profile
The IC follows the standard Li-Ion battery charge profile
with four charging phases: dead battery, precondition-
ing, constant current, and constant voltage. The battery
charge current is a function the battery voltage and the
IC’s hardware and register settings. Table 3 shows
these settings.
Table 3: Charging Current Setting
VBAT
Charging
Current
Current set by
< VBATDEAD
IDBATTERY
Fixed at 10mA
VBATDEAD ~
VBATSHORT
ISHORT
I2C Configurable: 1%, 2%,
4%, 8% of IOLIM current
VBATSHORT ~
VBATLOW
IPRECHG
I2C Configurable: 5% to
20% of IOLIM current
> VBATLOW
ICHG
I2C and Hardware
Configurable
> VTERM
0A
None
Voltage
VBATLOW
Battery Voltage
Charge Current
Trickle
Charge
Pre-
Charge
Fast Charge and Voltage Regulation
IPRECHARGE
ITERM
ISHRT
Dead
Battery
VDBATTERY
VTERM
IDBATTERY
IFASTCHARGE
Regulate VTERM after
charge complete
Current
Figure 10: Battery Charging Profile
Setting Charge Current
The battery charging current, ICHG, is set by a combina-
tion of a current sense resistor, an OLIM resistor, and a
scaling factor defined by I2C bits IFCHG[6:0] in register
0x18h. The maximum allowable charge current is 5A.
Figure 11 shows the hardware circuitry that sets IOLIM.
IOLIM is the maximum charge current set by hardware.
The actual battery charge current, ICHG, can be scaled
from 1% to 100% of IOLIM in 1% steps. The following
equation defines the final charge current.
I
I
∗IFCHG 6: 0
Where IOLIM is the hardware programmed charging cur-
rent and IFCHG[6:0] is the scaling factor. IFCHG[6:0] is
the decimal equivalent value in this register. For exam-
ple, if IOLIM, is programmed to 4A and IFCHG[6:0] =
1001011b (75% decimal), the final charge current = 4A
* 0.75 = 3A.
Note that IFCHG[6:0] is a 7 bit register and can be pro-
grammed between 0x00h and 0x7Fh (0% and 127%). If
a value of 0x00h is written to the register, the register
retains 0x00h, but the IC sets the charge current to 1%.
If a value above 0x64h (100%) is written to the register,
the IC retains the written value, but sets the charge cur-
rent to 100%.
To Battery
RCS_OUT
ROLIM
ROSRN
ROSRP
COSR
OSRN
OSRP
VBAT
OLIM
RCS_COMP
CCS_COMP
Figure 11: Charge Current Circuitry
The current sense resistor and OLIM resistor set the
IOLIM current.
1000
_
Where ROLIM is the resistor from the OLIM pin to AGND
in ohms and RCS_OUT is the current sense resistor value
in ohms. The term 1000V^2/A is a constant with the
units volts^2/Ampere.
The current sense resistor, RCS_OUT, value should be
chosen to give a maximum current sense voltage be-
tween 20mV and 50mV. 50mV is the absolute maximum
allowable voltage. Using lower voltages reduces the re-
sistor’s power dissipation, but decreases accuracy. At
lower charging currents, additional RC compensation
must be placed in parallel with ROLIM. Table 4 gives rec-
ommended resistor values for different values of IOLIM
current. Contact sales@active-semi.com for compensa-
tion information if other configurations are required.


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