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LTC4009 Datasheet(PDF) 7 Page - Linear Technology |
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LTC4009 Datasheet(HTML) 7 Page - Linear Technology |
7 / 28 page 4009fd LTC4009 LTC4009-1/LTC4009-2 pin FuncTions CLN (Pin 1): Adapter Input Current Limit Negative Input. The LTC4009 senses voltage on this pin to determine if the charge current should be reduced to limit total input current. The threshold is set 100mV below the CLP pin. An external filter should be used to remove switching noise. This input should be tied to CLP if not used. Operating voltage range is (CLP – 110mV) to CLP. CLP (Pin 2): Adapter Input Current Limit Positive Input. The LTC4009 also draws power from this pin, including a small amount for some shutdown functions. Operating voltage range is GND to 28V. DCIN (Pin 3): DC Power Input. The LTC4009 draws power fromthispinwhenanexternalDCpowersourceispresent. This pin is typically isolated from the CLP pin by a diode and should be bypassed with a capacitance of 0.1µF or more. Operating voltage range is GND to 28V. ICL (Pin 4): Active-Low Input Current Limit Indicator Out- put. This open-drain output pulls to GND when the charge current is reduced because of AC adapter input current limiting. This output should be left floating if not used. DCDIV (Pin 5): AC Adapter Present Comparator Input. The LTC4009 senses voltage on this pin to determine when an adequate DC power source is present, or if an overvoltage condition exists. An external resistor divider programs these threshold levels relative to DCIN. Operating voltage range is GND to INTVDD. SHDN (Pin 6): Active-low Shutdown Input. Driving SHDN below 300mV unconditionally forces the LTC4009 into the shutdown state. This input has a 50k Ω internal pull-down to GND. Operating voltage range is GND to INTVDD. ACP (Pin 7): Active-Low AC Adapter Present Indicator Output.Thisopen-drainoutputpullstoGNDwhenadequate AC adapter (DC) voltage is present, based on the DCDIV input. This output should be left floating if not used. CHRG (Pin 8): Active-Low Charge Indicator Output. This open-drain output provides three levels of information about charge status using a strong pull-down, 25µA weak pull-down or high impedance. Refer to the Operation and Applications Information sections for further details. This output should be left floating if not used. FBDIV (Pin 9, LTC4009): Battery Voltage Feedback Resis- tor Divider Source. The LTC4009 connects this pin to BAT when charging is in progress. FBDIV is an open-drain PFET output to BAT with an operating voltage range of GND to BAT. Battery Shutdown Current PWM Frequency vs Charge Current CHARGE CURRENT (A) 0 0 100 200 300 400 600 0.5 1.0 1.5 2.0 4009 G13 2.5 3.0 500 BAT = 14.5V BAT = 12V BAT = 5V CLP = 15V RSENSE = 33m RIN = 3.01k BATTERY VOLTAGE (V) 0 15 20 25 20 4009 G14 10 5 0 5 10 15 25 DC1104 WITH SSB44 INPUT DIODE LTC4009 ALL PINS Typical perForMance characTerisTics (TA = 25°C unless otherwise noted. DIN = SSB44, L = IHLP-2525 6.8µH) |
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Similar Description - LTC4009_15 |
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