BQ25872 Datasheet, PDF (15/68 Pages) Texas Instruments – Battery Switch Charger

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8 Detailed Description
bq25872
SLUSCQ6 – OCTOBER 2016
8.1 Overview
The bq25872 is an I²C controlled device and a single cell Li-Ion battery charger. The device allows 7-A charging
current with 13-mΩ MOSFETs for minimum power loss. A 10 -bit ADC, four linear regulation loops and multiple
OVP and OCP are integrated for host monitoring and safe operation of the device.
8.1.1 Device Protection Overview
The following table summarizes the protection features implemented in the device.
Table 1. Protection Features Overview
PROTECTION
NAME
VUSB OVP
VBUS_OVP
VOUT_REG
VOUT_OVP
VDROP_OVP
VDROP_ALM
VBAT_REG
VBAT_OVP
IBAT_REG
IBAT_OCP
IBUS_OCP
IBUS_REG
IBUS_RCP
TS_BUS_OTP
TS_BAT_OTP
DESCRIPTION
RESPOND
Monitors VUSB voltage and compares to the voltage
defined by OVPSET and VUSBOVP_I2C
Turn off external OVPFET via OVPGATE
(REG29[3:2])
Monitors VBUS voltage and compares to the
threshold programmed in REG 0A
Turn off load switch after a deglitch time of t_{VBUS_OVP}
Monitors VOUT voltage and compares to the
threshold programmed in REG 0B
Monitors VOUT voltage and compares to 1.04 times
of the threshold programmed in REG 0B
Enable linear regulation of battery switch within a response time
of t_{LDO_RES}
Turn off load switch after a deglitch time of t_{VOUT_OVP}
Monitors voltage difference between VBUS and
VOUT (VBUS – VOUT) and compares to the
threshold programmed in REG 0C
Turn off load switch after a deglitch time of t_{VDROP_OVP}
Monitors voltage difference between VBUS and
VOUT (VBUS – VOUT) and compares to the
threshold programmed in REG 0D
INT is asserted low to alert host
Monitors VBAT voltage and compares to the
threshold programmed in REG 0E
Monitors VBAT voltage and compares to 1.04 times
of the threshold programmed in REG 0E
Enable linear regulation of battery switch within a response time
of t_{LDO_RES}
Turn off load switch after a deglitch time of t_{VBAT_OVP}
Monitors battery current measured by sensing
resistor and compares to the threshold programmed
in REG 0F
Enable linear regulation of battery switch within a response time
of t_{LDO_RES}
Monitors VBAT voltage and compares to 1.05 times
of the threshold programmed in REG 0E
Turn off load switch after a deglitch time of t_{VBAT_OVP}
Monitors input current and compares to the threshold
programmed in REG 09
Turn off load switch after a deglitch time of t_{IBUS_OCP}
Monitors input current and compares to the threshold
programmed in REG 10
Monitors current flowing from battery to adaptor and
compares to the threshold selected in REG 06
Enable linear regulation of battery switch within a response time
of t_{LDO_RES}
Turn off load switch after a deglitch time of t_{IBUS_RCP}
Monitors temperature based on voltage measured by
a negative temperature coefficient (NTC) resistor at
VBUS and compares to the threshold programmed in
REG 11
Turn off load switch after a deglitch time of t_{TS_OTP}
Monitors temperature based on voltage measured by
a negative temperature coefficient (NTC) resistor at
battery and compares to the threshold programmed
in REG 12
Turn off load switch after a deglitch time of t_{TS_OTP}
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