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ISL88731AHRZ-T Datasheet(PDF) 10 Page - Intersil Corporation |
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ISL88731AHRZ-T Datasheet(HTML) 10 Page - Intersil Corporation |
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10 / 23 page  10 FN6738.1 January 7, 2009 Undervoltage Detect and Battery Trickle Charging If the voltage at CSON falls below 2.5V, the ISL88731A reduces the charge current limit to 128mA to trickle charge the battery. When the voltage rises above 2.7V the charge current reverts to the programmed value in the ChargeCurrent register. Over-Temperature Protection If the die temperature exceeds +150°C, it stops charging. Once the die temperature drops below +125°C, charging will start up again. Overvoltage Protection ISL88731 has an Overvoltage Protection circuit that limits the output voltage when the battery is removed or disconnected by a pulse charging circuit. If CSON exceeds the output voltage set point in the chargevoltage register by more than 300mV an internal comparator pulls VCOMP down and turns off both upper and lower FETs of the buck as in Figure 15. There is a delay of approximately 1µs between VOUT exceeding the OVP trip point and pulling VCOMP, LGATE and UGATE low. After UGATE and LGATE are turned OFF inductor current continues to flow through the body diode of the lower FET and VOUT continues to rise until inductor current reaches zero. FIGURE 15. OVERVOLTAGE PROTECTION IN ISL88731 ISL88731A |
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