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LTC4007 Datasheet(PDF) 6 Page - Linear Technology |
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LTC4007 Datasheet(HTML) 6 Page - Linear Technology |
6 / 20 page 6 LTC4007 4007i PI FU CTIO S BAT (Pin 15): Battery Sense Input and the Negative Reference for the Current Sense Resistor. A precision internal resistor divider sets the final float potential on this pin. The resistor divider is disconnected during shutdown. CHEM (Pin 16):Select 4.1V or 4.2V cell chemistry by connecting the pin to GND or open, respectively. Internal 14 µA pull-up to 5.3V. Can also be driven with open- collector/drain logic levels. FLAG (Pin 17): Active low open-drain output that indi- cates when charging current has declined to 10% of maximum programmed current. A pull-up resistor is required if this function is used. The pin is capable of sinking at least 100 µA. CLP (Pin 18): Positive input to the supply current limiting amplifier, CL1. The threshold is set at 100mV above the voltage at the CLN pin. When used to limit supply current, a filter is needed to filter out the switching noise. If no current limit function is desired, connect this pin to CLN. CLN (Pin 19): Negative Reference for the Input Current Limit Amplifier, CL1. This pin also serves as the power supply for the IC. A 10 µF to 22µF bypass capacitor should be connected as close as possible to this pin. TGATE (Pin 20): Drives the top external P-channel MOSFET of the battery charger buck converter. PGND (Pin 21): High Current Ground Return for the BGATE Driver. BGATE (Pin 22): Drives the bottom external N-channel MOSFET of the battery charger buck converter. INFET (Pin 23): Drives the Gate of the External Input PFET. SHDN (Pin 24): Charger is shut down and timer is reset when this pin is HIGH. Internal 10 µA pull-up to 3.5V. This pin can also be used to reset the charger by applying a positive pulse that is a minimum of 0.1 µs long. |
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Similar Description - LTC4007 |
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