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LM2601MTC Datasheet(PDF) 4 Page - National Semiconductor (TI) |
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LM2601MTC Datasheet(HTML) 4 Page - National Semiconductor (TI) |
4 / 6 page Electrical Characteristics (Continued) Note 5: Adapter Enable input is used to change the state of Disconnect, Direction Sense input is used to change the state of Backfeed. a. Fall time is measured as the time it takes Backfeed or Disconnect voltage to go from a high level (approx. VADAPTER − 0.5V) to (VADAPTER − 4V) after the signal is initiated at Adapter Enable or Direction Sense. b. Rise time is measured as the time it takes Backfeed or Disconnect voltage to go from a low level (approx. 0.5V) to (VADAPTER − 2V) after the signal is initiated at Adapter Enable or Direction Sense. Typical Application 10130903 Notes 1. R SENSE value should be selected to guarantee that a programmed over current will cause a voltage drop across R SENSE of approx. 135mV. If a higher value of R SENSE has to be selected then R1/R3 resistor divider should be used to scale the voltage drop down. 2. Internal and external circuits associated with Direction Sense and Backfeed FET pins allow to emulate a Schot- tky diode functionality with much lower forward voltage drop and, therefore, with much lower power dissipation. R2/R4 resistor divider programs the backfeed current protection threshold. The backfeed FET Q1 turns off when the backfeed current pulse level causes more than 9 mV (typical value) voltage drop between V adapter pin and Direction Sense pin. 3. Voltage difference (V DIRECTION SENSE -VADAPTER) must be higher than 20mV to reliably isolate the adapter in case of leakage. 4. R5 and R6 prevent the FETs from turning on unless driven by LM2601. 5. C DELAY value can be calculated from the following for- mula: C DELAY(nF) = TDELAY(µs)/90 at 25˚C 6. T DELAY temperature coefficient equals 4000ppm/˚C. See also the Typical Delay Time vs. Temperature graph. 7. Pin Master Power Source (MPS) should be connected to System Management Controller’s (SMC) and battery packs’ GPIOs. When SMC detects a powered AC adapter via active signals at Charger Present or Adapter Present outputs, it asserts Adapter Enable signal and isolates the battery pack(s). Adapter Enable signal turns the Disconnect FET on. When the AC adapter is un- plugged or powered off, SMC enables one of the system battery packs. The battery packs’ embedded controller starts driving the logic MPS signal high that turns the Disconnect FET off. www.national.com 4 |
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