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BQ25619 Arkusz danych(PDF) 25 Page - Texas Instruments

Numer części BQ25619
Szczegółowy opis  BQ25619 I2C Controlled 1-Cell 1.5-A Battery Charger with 20-mA Termination and 1-A Boost Operation
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Strona internetowa  http://www.ti.com
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BQ25619 Arkusz danych(HTML) 25 Page - Texas Instruments

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BQ25619
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SLUSDF8A – JUNE 2019 – REVISED JULY 2019
Product Folder Links: BQ25619
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Copyright © 2019, Texas Instruments Incorporated
8.3.9 Protections
8.3.9.1 Voltage and Current Monitoring in Buck Mode
8.3.9.1.1
Input Over-Voltage Protection (ACOV)
The input voltage is sensed via the VAC pin. The default OVP threshold is 14.2 V, and can be programmed at
5.7 V/6.4 V/11 V/14.2 V via OVP[1:0] register bits. ACOV event will immediately stop converter switching whether
in buck or boost mode. The device will automatically resume normal operation once the input voltage drops back
below the OVP threshold. During ACOV, REGN LDO is on, and the device doesn't enter HIZ mode.
During ACOV, the fault register CHRG_FAULT bits are set to 01. An INT pulse is asserted to the host.
8.3.9.1.2
System Over-Voltage Protection (SYSOVP)
The charger device clamps the system voltage during a load transient so that the components connected to the
system are not damaged due to high voltage. VSYSOVP threshold is about 300 mV above battery regulation
voltage when battery charging is terminated. Upon SYSOVP, converter stops switching immediately to clamp the
overshoot. The charger pulls 30-mA ISYS_LOAD discharge current to bring down the system voltage.
8.3.9.2 Voltage and Current Monitoring in Boost Mode
8.3.9.2.1
Boost Mode Over-Voltage Protection
When the PMID voltage rises above regulation target and exceeds VBST_OVP, the device stops switching
immediately and the device exits boost mode . BST_CONFIG bit is set to 0. During boost mode over-voltage, the
fault register bit BOOST_FAULT is set tot 1 to indicate fault in boost operation. An INT is asserted to the host.
8.3.9.2.2
PMID Over-Current Protection
The BQ25619 closely monitors the battery discharge current through BATFET (Q4) to ensure safe boost mode
operation. During over-current condition when output current exceeds ISYS_OCP_Q4, the device stops converter in
100 µs. When over-current condition is detected, the fault register bit BOOST_FAULT is set high to indicate fault
in boost operation. An INT is asserted to the host.
8.3.9.3 Thermal Regulation and Thermal Shutdown
8.3.9.3.1
Thermal Protection in Buck Mode
Besides the battery temperature monitor on TS pin, the device monitors the internal junction temperature TJ to
avoid overheating the chip and limits the IC junction temperature in buck mode. When the internal junction
temperature exceeds thermal regulation limit (110°C), the device lowers down the charge current. During thermal
regulation, the actual charging current is usually below the programmed battery charging current. Therefore,
termination is disabled, the safety timer runs at half the clock rate, and the status register THERM_STAT bit goes
high.
Additionally, the device has thermal shutdown to turn off the converter and BATFET when IC surface
temperature exceeds TSHUT 150ºC. The BATFET and converter is enabled to recover when IC temperature is
130ºC. The fault register CHRG_FAULT is set to 10 during thermal shutdown and an INT is asserted to the host.
8.3.9.3.2
Thermal Protection in Boost Mode
Besides the battery temperature monitor on TS pin, The device monitors the internal junction temperature to
provide thermal shutdown during boost mode. When IC junction temperature exceeds TSHUT 150ºC, the boost
mode is disabled by setting BST_CONFIG bit low . When IC junction temperature is below 145ºC, the host can
re-enable boost mode.
8.3.9.4 Battery Protection
8.3.9.4.1
Battery Over-Voltage Protection (BATOVP)
The battery over-voltage limit is clamped at 4% above the battery regulation voltage. When battery over voltage
occurs, the charger device immediately stops switching. The fault register BAT_FAULT bit goes high and an INT
is asserted to the host.


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