BQ25895_16 Datasheet, PDF (15/67 Pages) Texas Instruments – Adjustable Voltage 3.1-A Boost Operation

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bq25895
SLUSC88A – MARCH 2015 – REVISED MAY 2016
8 Detailed Description
The device is a highly integrated 5-A siwtch-mode battery charger for single cell Li-Ion and Li-polymer battery. It
is highly integrated with the input reverse-blocking FET (RBFET, Q1), high-side siwtching FET (HSFET, Q2) ,
low-side switching FET (LSFET, Q3), and battery FET (BATFET, Q4). The device also integrates the boostrap
diode for the high-side gate drive.
8.1 Functional Block Diagram
VBUS
V_{VBUS_UVLOZ}
VBATZ +80mV
VACOV
V_INDPM
I _INDPM
IC T_J
T_REG
SYS
VSYSMIN
UVLO
SLEEP
ACOV
EN_HIZ
REGN
LDO
RBFET
(Q1)
Q1 Gate
Control
FBO
VBUS
V OTG_OVP
VBUS_OVP_BOOST
IQ2
V
OTG_HSZCP
Q2_UCP_BOOST
IQ3
V
OTG_BAT
Q3_OCP_BOOST
BAT
104%xV_{BAT_REG}
BAT
BATOVP
V _{BAT_REG}
I _{LSFET_UCP}
IQ3
UCP
CONVERTER
CONTROL
HSFET (Q2)
REGN
Q2_OCP
LSFET (Q3)
IQ2
I _{HSFET_OCP}
ICHG_REG
EN_HIZ
EN_CHARGE
EN_BOOST
REFRESH
V _BTST -V_SW
V _{BTST_REFRESH}
PMID
REGN
BTST
SW
PGND
ILIM
DSEL
D+
D±
OTG
INT
STAT
Input
Source
Detection
SYS
REF
DAC
USB
Adapter
I2C
Interface
Converter
Control State
Machine
BAD_SRC
TSHUT
BAT_GD
I _BADSRC
I_DC
IC T_J
TSHUT
BAT
V_BATGD
ADC Control
RECHRG
V_REG -V_RECHG
BAT
CHARGE
CONTROL
STATE
MACHINE
TERMINATION
BATLOWV
I _CHG
I _TERM
V _BATLOWV
BAT
BATSHORT
SUSPEND
V _SHORT
BAT
I _CHG
VCHG_REG
I _{BAT_REG}
Q4 Gate
Control
BATFET
(Q4)
V_QON
ADC
I _CHG
VBUS
BAT
SYS
TS
bq25895
Battery
Sensing
Thermistor
BAT
/QON
TS
SCL SDA
CE
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