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LTC4060 Datasheet(PDF) 10 Page - Linear Technology |
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LTC4060 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  10 LTC4060 4060f Table 1. LTC4060 Time Limit Programming Examples TYPICAL BATTERY CHARGE BATTERY AUTOMATIC FAST VOLTAGE TIME VOLTAGE RECHARGE UVLO EXIT, BATTERY FAST CHARGE STABILIZATION LIMIT SAMPLING ENTRY INSERTION/REMOVAL/OVERVOLTAGE, CHARGE RATE HOLD OFF (tMAX) INTERVAL DELAY FAST CHARGE ENTRY AND CURRENT RPROG CTIMER (C) (MINUTES) (HOURS) (SECONDS) (SECONDS) THERMISTOR EVENT DELAYS (ms) 2A 698Ω 1nF 1.5 4.6 to 5.7 1.1 15 15 to 31 175 to 260 2A 698Ω 1.5nF 1 6.9 to 8.4 1.6 23 23 to 46 260 to 390 2A 698Ω 1.8nF 0.75 8.4 to 10.3 2 28 28 to 56 320 to 480 2A 698Ω 2.7nF 0.5 12.6 to 15.4 3 42 42 to 84 480 to 720 400mA 3480Ω 180pF 1.5 4.2 to 5.2 1 14 14 to 28 160 to 240 400mA 3480Ω 270pF 1 6.3 to 7.7 1.5 21 21 to 42 240 to 360 400mA 3480Ω 390pF 0.75 8.9 to 11 2.1 30 30 to 60 340 to 510 400mA 3480Ω 560pF 0.5 12.6 to 15.4 3 42 42 to 84 480 to 720 OPERATIO applied to the SHDN pin, shutdown ends and charge quali- fication is entered. Charge Qualification After exiting the sleep or shutdown modes the LTC4060 will check for the presence of a battery and for proper battery temperature (if a thermistor is used) before initiat- ing charging. When VCELL (VBAT/Number of Cells) is below 2.05V (VBR), a battery is assumed to be present. Should VCELL rise above 1.95V (VBOV) for a time greater than the battery overvoltage event delay shown in the far right column of Table 1, then a battery overvoltage condition is detected and charging stops. Once stopped in this way, qualifica- tion can be reinitiated after VCELL has fallen below 1.9V (VBOV – VBOVH) only by removing and replacing the battery (or replacing the battery if the overvoltage condition is a result of battery removal), toggling the SHDN pin low to high or removing and reapplying power to the charger. If the NTC pin voltage is above the temperature disable threshold (VNDIS), the LTC4060 verifies that the ther- mistor temperature is between 5°C and 45°C. Charging will not initiate until these temperature limits are met. The LTC4060 continues to qualify important voltage and temperature parameters during all charging states. If VCC drops below the undervoltage lockout threshold, sleep mode is entered. If the internal die temperature becomes excessive, charg- ing stops and the part enters the shutdown state. Once in the shutdown state charge qualification can be reinitiated only when the die temperature drops to normal and then by removing and replacing the battery or toggling the SHDN pin low to high or removing and reapplying power to the charger. Precharge The state that is entered when qualified charging begins is precharge. The CHRG status output is set low and remains low during both precharge and fast charge. If the voltage on VCELL is below the 900mV (VFCQ) fast charge qualifica- tion voltage, the LTC4060 charges using one-fifth the maximum programmed charge current. The cell voltage is continuously checked to determine when the battery is ready to accept a fast charge. Until this voltage reaches VFCQ, the LTC4060 remains in precharge. If an external thermistor indicates that the sensed tem- perature is beyond a range of 5°C to 45°C charging is suspended, the charge timer is paused and the CHRG status output remains low. Normal charging resumes from the previous state when the sensed temperature rises above 5°C or falls below 45°C. Fast Charge When the average cell voltage exceeds VFCQ, the LTC4060 transitions from the precharge to the fast charge state and |
Similar Part No. - LTC4060_15 |
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Similar Description - LTC4060_15 |
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