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LTC4052EMS8E-4.2 Datasheet(PDF) 5 Page - Linear Technology |
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LTC4052EMS8E-4.2 Datasheet(HTML) 5 Page - Linear Technology |
5 / 12 page LTC4052-4.2 5 405242f BLOCK DIAGRA 4052 BD – + – + – + – + – + – + VFLOAT VRECHRG VMIN VMAX CHARGE PUMP TRIPLER LOGIC + TIMERS 8 2 5 4 3 7 1 + – + – VIN SENSE GATE BAT 105mV 45mV TRICKLE FAST 1.23V 1.23V THERMAL SHUTDOWN REFERENCE OSCILLATOR 100ms FILTER 6 40 µA VIN GND TIMER CHRG SLEEP ACPR CLK STOP C/10 TEMP IMAX BAT 24mA 10m Ω PI FU CTIO S A series RC network from the GATE to the VIN pin is required to control the slew rate at the VIN pin when the switch is turned on or off. The slew rate control prevents excessive current from the capacitor usually located in the wall adapter from flowing into the battery when the pass transistor turns on. BAT (Pin 8): Battery Sense Input Pin. An internal resistor divider presets the final float voltage to 4.2V. If the BAT pin drops below 4.05V after the charge cycle has ended, the timer resets and a new charge cycle begins. This pin is clamped to 4.7V if the battery is disconnected while charging. |
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