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LTC4055 Datasheet(PDF) 9 Page - Linear Technology |
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LTC4055 Datasheet(HTML) 9 Page - Linear Technology |
9 / 24 page LTC4055/LTC4055-1 9 4055fb TIMER (Pin 12): TimerCapacitor.PlacingacapacitorCTIMER to GND sets the timer period. The timer period is: t Hours C R Hours Fk TIMER TIMER PROG () •• .• = μ 3 0 1 100 Charge time is increased as charge current is reduced due to input voltage regulation, load current and current limit selection (HPWR). Shorting the TIMER pin to GND disables the battery charging functions. ACPR (Pin 13): Wall Adapter Present Output. Active low open-drain output pin. A low on this pin indicates that the wall adapter input comparator has had its input pulled above the input threshold and power is present on IN1/IN2 or OUT (i.e., above UVLO threshold). CHRG (Pin 14): Open-Drain Charge Status Output. When the battery is being charged, the CHRG pin is pulled low by an internal N-channel MOSFET. When the timer runs out or the input supply or output supply is removed, the CHRG pin is forced to a high impedance state. PIN FUNCTIONS VNTC (Pin 15): Output Bias Voltage for NTC. A resistor from this pin to the NTC pin will set up the bias for an NTC thermistor. NTC (Pin 16): Input to the NTC Thermistor Monitoring Circuits. Under normal operation, tie a thermistor from the NTC pin to ground and a resistor of equal value from NTC to VNTC. When the voltage on this pin is above 0.74 • VVNTC (Cold, 0°C) or below 0.29 • VVNTC (Hot, 50°C) the timer is suspended, but not cleared, the charging is disabled and the CHRG pin remains in its former state. When the voltage on NTC comes back between 0.74 • VVNTC and 0.29 • VVNTC, the timer continues where it left off and charging is re-enabled if the battery voltage is below the recharge threshold. There is approximately 3°C of temperature hysteresis associated with each of the input comparators. If the NTC function is not to be used, connect the NTC to ground. This will disable all of the LTC4055/LTC4055-1 NTC functions. Exposed Pad (Pin 17): Ground. The Exposed Pad must be soldered to a good thermally conductive PCB ground. |
Similar Part No. - LTC4055_15 |
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Similar Description - LTC4055_15 |
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