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LTC4007-1 Datasheet(PDF) 7 Page - Linear Technology |
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LTC4007-1 Datasheet(HTML) 7 Page - Linear Technology |
7 / 24 page 7 LTC4007-1 40071f PI FU CTIO S PROG (Pin 9): Current Programming/Monitoring Input/ Output. An external resistor to GND programs the peak charging current in conjunction with the current sensing resistor. The voltage at this pin provides a linear indication of charging current. Peak current is equivalent to 1.19V. Zero current is approximately 0.3V. A capacitor from PROG to ground is required to filter higher frequency components. The maximum resistance to ground is 100k. Values higher than 100k can cause the charger to shut down. ICL (Pin 10): Input Current Limit Indicator. Active low digital output. Internal 10 µA pull-up to 3.5V. Pulled low if the charger current is being reduced by the input current limiting function. The pin is capable of sinking at least 100 µA. If VLOGIC is greater than 3.3V, add an external pull-up. CSP (Pin 11): Current Amplifier CA1 Input. The CSP and BAT pins measure the voltage across the sense resistor, RSENSE, to provide the instantaneous current signals re- quired for both peak and average current mode operation. BAT (Pin 12): 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 13):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 14): 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 15): 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 16): 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 17): Drives the top external P-channel MOSFET of the battery charger buck converter. PGND (Pin 18): High Current Ground Return for the BGATE Driver. NC (Pin 19): No Connect. BGATE (Pin 20): Drives the bottom external N-channel MOSFET of the battery charger buck converter. INFET (Pin 21): Drives the Gate of the External Input PFET. SHDN (Pin 22): 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. DCIN (Pin 23): External DC Power Source Input. Bypass this pin with at least 0.01 µF. See Applications Information. CHG (Pin 24): 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). Exposed Pad (Pin 25): The exposed pad, GND and PGND should be connected together with a low ohmic connec- tion. |
Similar Part No. - LTC4007-1_15 |
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Similar Description - LTC4007-1_15 |
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