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LTC4052EMS8E-4.2 Datasheet(PDF) 4 Page - Linear Integrated Systems |
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LTC4052EMS8E-4.2 Datasheet(HTML) 4 Page - Linear Integrated Systems |
4 / 8 page LTC4052-4.2 4 405242i BLOCK DIAGRA The LTC4052 is a complete lithium-ion battery pulse charger with an internal 0.35 Ω N-MOSFET switch driven by an internal charge pump. The charge current is set by the current limit of the input supply (wall adapter). An external RSENSE sets the maximum allowable charge overcurrent and prevents a wall adapter with the wrong current limit from damaging the battery. If the current limit of the input supply is above IMAX, the charger will imme- diately terminate charging and will retry after 640ms (CTIMER = 0.1µF). If the battery is disconnected while in fast charge mode, the charge pump will be turned off when the voltage at the BAT pin rises above 4.7V and turned back on when the voltage drops below the float voltage. A charge cycle begins when the voltage at the VIN pin rises above the BAT pin by 45mV. The charger will go into trickle charge mode if the battery voltage is below 2.45V. The trickle charge current is preset to 24mA and is provided by an internal current source. In trickle mode, both the pass transistor and charge pump are off. OPERATIO 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 |
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