LTC4007EGN#PBF

LINEAR TECHNOLOGY  LTC4007EGN#PBF  芯片, 电池充电控制器

The is a 4A high efficiency standalone Li-ion Battery Charger for 3 or 4-cell lithium-ion batteries. The PWM controller uses a synchronous, quasi-constant frequency, constant off-time architecture that will not generate audible noise even when using ceramic capacitors. Charging current is programmable to ±4% accuracy using a programming resistor. Charging current can also be monitored as a voltage across the programming resistor. The output float voltage is pin programmed for cell count 3/4 cells and chemistry 4.2/4.1V. A timer, programmed by an external resistor, sets the charge termination time. Charging is automatically restarted when cell voltage falls below 3.9V/cell. If the cell voltage is less than 2.5V, a low-battery indicator asserts and can be used to program a trickle charge current to safely charge depleted batteries. The FAULT pin is also asserted and charging terminates if the low-battery condition persists for more than 1/4 of total charge time.

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Complete charger controller for 3 or 4-cell Lithium-Ion batteries

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High conversion efficiency up to 96%

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Output currents exceeding 4A

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±0.8% Charging voltage accuracy

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Built-in charge termination for Li-ion batteries

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AC adapter current limiting maximizes charge rate

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Thermistor input for temperature qualified charging

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Wide input voltage range 6 to 28V

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0.5V Dropout voltage, 98% maximum duty cycle

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Programmable charge current ±4% accuracy

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Indicator outputs for charging, C/10 current detection, AC adapter present, low battery

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Charging current monitor output