BQ25606 Datasheet, PDF (23/43 Pages) Texas Instruments – Standalone 3.0-A, Single Cell Battery Charger With 40V Over Voltage Protection Controller

bq25606
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SLUSCK6 – MAY 2017
• VBUS above V_{VBUS_UVLO}
• VBUS above battery (not in sleep)
• VBUS below V_{VAC_OV} threshold
• VBUS above V_VBUSMin (typical 3.8 V) when I_BADSRC (typical 30 mA) current is applied (not a poor source)
• Completed input Source Type Detection
8.3.7.2 Charging Status indicator (STAT)
The device indicates charging state on the open drain STAT pin. The STAT pin can drive LED.
Table 4. STAT Pin State
CHARGING STATE
Charging in progress (including recharge)
Charging complete
Sleep mode, charge disable
Charge suspend (input overvoltage, TS fault, timer fault or system overvoltage)
Boost Mode suspend (due to TS fault)
STAT INDICATOR
LOW
HIGH
HIGH
Blinking at 1 Hz
8.3.8 Protections
8.3.8.1 Input Current Limit
The device's ILIM pin is to program maximum input current when D+/D- detection identifies an unknown adaptor
plugged in. The maximum input current is set by a resistor from ILIM pin to ground as:
I_INMAX
=
K_ILIM
R_ILIM
(3)
8.3.8.2 Voltage and Current Monitoring in Converter Operation
The device closely monitors the input and system voltage, as well as internal FET currents for safe buck and
boost mode operation.
8.3.8.2.1 Voltage and Current Monitoring in Buck Mode
8.3.8.2.1.1 Input Overvoltage (ACOV)
If VAC exceeds V_{VAC_OV} , the OVPFET turns off in 200ns to protect VBUS. In the meantiem, HSFET stops
switching immediately.
8.3.8.2.1.2 System Overvoltage Protection (SYSOVP)
The charger device clamps the system voltage during load transient so that the components connect to system
would not be damaged due to high voltage. SYSOVP threshold is 350 mV above minimum system regulation
voltage when the system is regulate at V_SYSMIN. Upon SYSOVP, converter stops switching immediately to clamp
the overshoot. The charger provides 30 mA discharge current to bring down the system voltage.
8.3.8.3 Voltage and Current Monitoring in Boost Mode
The device closely monitors the VBUS voltage, as well as RBFET and LSFET current to ensure safe boost mode
operation.
8.3.8.3.1 VBUS Soft Start
When the boost function is enabled, the device soft-starts boost mode to avoid inrush current.
8.3.8.3.2 VBUS Output Protection
The device monitors boost output voltage and other conditions to provide output short circuit and overvoltage
protection. The Boost build in accurate constant current regulation to allow OTG to adaptive to various types of
load. If short circuit is detected on VBUS, the Boost turns off and retry 7 times. If retries are not successful, OTG
is disabled.
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