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LTC4007EGN Datasheet(PDF) 6 Page - Linear Technology |
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LTC4007EGN Datasheet(HTML) 6 Page - Linear Technology |
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6 / 24 page  6 LTC4007 4007fa PI FU CTIO S DCIN (Pin 1): External DC Power Source Input. Bypass this pin with at least 0.01 µF. See Applications Information. CHG (Pin 2): Charge Status Output. When the battery is being charged, the CHG pin is pulled low by an internal N-channel MOSFET. Internal 10 µA pull-up to 3.5V. If VLOGIC is greater than 3.3V, add an external pull-up. The timer function can be defeated by forcing this pin below 1V (or connecting it to GND). ACP(Pin 3): Open-Drain output to indicate if the AC adapter voltage is adequate for charging. This pin is pulled low by an internal N-channel MOSFET if DCIN is below BAT. A pull-up resistor is required. The pin is capable of sinking at least 100 µA. RT (Pin 4): Timer Resistor. The timer period is set by placing a resistor, RRT , to GND. This resistor is always required. The timer period is tTIMER = (1hour • RRT/154K). If this resistor is not present, the charger will not start. FAULT (Pin 5): Active low open-drain output that indi- cates charger operation has stopped due to a low-battery conditioning error, or that charger operation is suspended due to the thermistor exceeding allowed values. A pull-up resistor is required if this function is used. The pin is capable of sinking at least 100 µA. GND (Pin 6): Ground for Low Power Circuitry. 3C4C (Pin 7): Select 3-cell or 4-cell float voltage by connecting this pin to GND or open, respectively. Internal 14 µA pull-up to 5.3V. This pin can also be driven with open-collector/drain logic levels. High: 4 cell. Low: 3 cell. LOBAT (Pin 8): Low-Battery Indicator. Active low digital output. Internal 10 µA pull-up to 3.5V. If the battery voltage is below 2.5V/cell (or 2.44V/cell for 4.1V chemis- try batteries) LOBAT will be low. The pin is capable of sinking at least 100 µA. If VLOGIC is greater than 3.3V, add an external pull-up. NTC (Pin 9): A thermistor network is connected from NTC to GND. This pin determines if the battery temperature is safe for charging. The charger and timer are suspended and the FAULT pin is driven low if the thermistor indicates a temperature that is unsafe for charging. The thermistor function may be disabled with a 300k to 500k resistor from DCIN to NTC. TYPICAL PERFOR A CE CHARACTERISTICS Efficiency at 19VDC VIN Efficiency at 12.6V with 15VDC VIN CHARGE CURRENT (A) 1.00 0.50 1.50 2.00 2.50 3.00 4007 G10 16.8V 12.6V 100 95 90 85 80 75 CHARGE CURRENT (A) 1.00 0.50 1.50 2.00 2.50 3.00 4007 G11 100 95 90 85 80 75 |
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