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NCP1835B Datasheet(PDF) 10 Page - ON Semiconductor |
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NCP1835B Datasheet(HTML) 10 Page - ON Semiconductor |
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10 / 17 page  NCP1835 http://onsemi.com 10 Charge Status Indicator (CFLG) CFLG is an open−drain output that indicates battery charging or End−of−Charge (EOC) status. It is pulled low when charging in constant current mode and constant voltage mode. It will be forced to a high impedance state when the charge current drops to IEOC. When the charger is in shutdown mode, CFLG will also stay in the high impedance state. Fault Indicator (FAULT) FAULT is an open−drain output that indicates that a charge fault has occurred. It has two states: low or high impedance. In a normal charge cycle, it stays in a high impedance state. At fault conditions, it will be pulled low and terminate the charge cycle. A timeout fault occurs when the full charge or pre−charge timeouts are violated, or if the voltage on ISEL is greater than 1.4 V or lower than 0.35 V. There are two ways to get the charger out of a fault condition and back to a normal charge cycle. One can either toggle the EN pin from GND to a floating state or reset the input power supply. Adapter Present Indicator (V2P8) V2P8 is an input power supply presence indicator. When the input voltage, VCC, is above the power on threshold (VRISE, nominally 3.4 V) and is also 100 mV above the battery voltage, it provides a 2.8 V reference voltage that can source up to 2.0 mA. This voltage can also be used to power a microprocessor I/O. Enable/Disable (EN) Pulling the EN pin to GND disables the NCP1835. In shutdown mode, the internal reference, oscillator, and control circuits are all turned off. This reduces the battery drain current to less than 3.0 mA and the input supply current to 30 mA. Floating the EN pin enables the charger. Thermal Foldback An internal thermal foldback loop reduces the programmed charge current proportionally if the die temperature rises above the preset thermal limit (nominally 100 °C). This feature provides the charger protection from over heating or thermal damage. Figure 15 shows the full charge current reduction due to die temperature increase across the thermal foldback limit. For a charger with a 1.0 A constant charge current, the charge current starts decreasing when the die temperature hits 100 °C and is reduced to zero when the die temperature rises to 110 °C. Figure 15. Full Charge Current vs. Junction Temperature X−100 mA/C 100 °C IFCHG TJ, JUNCTION TEMPERATURE |
Similar Part No. - NCP1835B |
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Similar Description - NCP1835B |
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