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BQ29400ADCT3 Datasheet(PDF) 4 Page - Texas Instruments |
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BQ29400ADCT3 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 10 page www.ti.com CIN CIN CIN CIN RIN RIN RIN RIN VC1 VC2 VC3 VC4 GND 1.2 V (TYP) CD VDD OUT ICD = 0.18 µA (TYP) CVD CDELAY RVD OVERVOLTAGE PROTECTION DELAY TIME CALCULATION t d + 1.2 V C (DELAY) I CD C (DELAY) + t d I CD 1.2 V bq29400, bq29400A bq29401, bq29405 SLUS568B – JULY 2003 – REVISED NOVEMBER 2004 FUNCTIONAL BLOCK DIAGRAM When one of the cell voltages exceeds V(PROTECT), an internal current source begins to charge the capacitor, C(DELAY), connected to the CD pin. If the voltage at the CD pin, VCD, reaches 1.2 V, the OUT pin is activated and transitions high. An externally connected NCH FET is activiated and blows the external fuse in the positive battery rail, see Figure 1. If all cell voltages fall below V(PROTECT) before the voltage at pin CD reaches 1.2 V, the delay time does not run out. An internal switch clamps the CD pin to GND and discharges the capacitor, C(DELAY), and secures the full delay time for the next occurring overvoltage event. Once the pin OUT is activated, it transitions back from high to low after all battery cells reach V(PROTECT) - Vhys. The delay time is calculated as follows: Where I(CD) = CD current source = 0.18 µA 4 |
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