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BQ24315 Datasheet(PDF) 9 Page - Texas Instruments |
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BQ24315 Datasheet(HTML) 9 Page - Texas Instruments |
9 / 20 page www.ti.com TYPICAL APPLICATION CIRCUIT AC Adapter VDC GND C IN 1 7 2 5 4 6 8 bq24315 bq24080 ChargerIC SYSTEM IN OUT VBAT FAULT CE C OUT C OUT R BAT R CE Host Controller R FAULT V PU R PU 1 F m 1 F m 100kW 47kW 47kW 47kW R ILM DETAILED FUNCTIONAL DESCRIPTION POWER DOWN POWER-ON RESET OPERATION bq24315 SLUS817 – MARCH 2008 VOVP = 5.85V, IOCP = 1000mA, BVOVP = 4.35V Figure 20. The bq24315 is an integrated circuit designed to provide protection to Li-ion batteries from failures of the charging circuit. The IC continuously monitors the input voltage, the input current and the battery voltage. For an input overvoltage condition, the IC immediately removes power from the charging circuit by turning off an internal switch. For an overcurrent condition, it limits the system current at the threshold value, and if the overcurrent persists, switches the pass element OFF after a blanking period. If the battery voltage rises to an unsafe level, the IC disconnects power from the charging circuit until the battery voltage returns to an acceptable value. Additionally, the IC also monitors its own die temperature and switches off if it exceeds 140 °C. The input overcurrent threshold is user-programmable. The IC can be controlled by a processor, and also provides status information about fault conditions to the host. The device remains in power down mode when the input voltage at the IN pin is below the undervoltage threshold UVLO. The FET Q1 connected between IN and OUT pins is off, and the status output, FAULT, is set to Hi-Z. The device resets when the input voltage at the IN pin exceeds the UVLO threshold. All internal counters and other circuit blocks are reset. The IC then waits for duration tDGL(PGOOD) for the input voltage to stabilize. If, after tDGL(PGOOD), the input voltage and battery voltage are safe, FET Q1 is turned ON. The IC has a soft-start feature to control the inrush current. The soft-start minimizes the ringing at the input (the ringing occurs because the parasitic inductance of the adapter cable and the input bypass capacitor form a resonant circuit). Because of the deglitch time at power-on, if the input voltage rises rapidly to beyond the OVP threshold, the device will not switch on at all, instead it will go into protection mode and indicate a fault on the FAULT pin. The device continuously monitors the input voltage, the input current, and the battery voltage as described in detail in the following sections. Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): bq24315 |
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