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LTC1980 Datasheet(PDF) 7 Page - Linear Technology |
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LTC1980 Datasheet(HTML) 7 Page - Linear Technology |
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7 / 16 page  LTC1980 7 1980f REG (Pin 15): Bidirectional Regulator Mode Control Pin. A pull-up resistor is required between this pin and VBIAS2. This pin is open when charging normally, has a weak pull- down (approximately 5µA) when conditioning the battery and a strong pull-down when in regulator mode. Pulling this pin low forces the IC into regulator mode. MODE (Pin 16): Selects different operating modes in both charger and DC/DC converter configurations. Also en- ables and disables Burst Mode operation. See Mode Pin Operation table in Application section. TIMER (Pin 17): A timing capacitor on this pin determines the normal charge time for charge termination. C(µF) = 0.25 • Time (Hours) VBAT (Pin 18): This pin connects to the positive terminal of the battery and the battery side of the power converter. VBIAS2 (Pin 19): Internally Generated Voltage. Bypass this pin with a 1µF or larger ceramic capacitor (or other low ESR capacitor). Do not connect any load to this pin. GND (Pin 20): Signal Ground. This pin should Kelvin- connect to the current sense resistor (RSENSE). ISENSE (Pin 21): Current Sense Input Pin. Connects inter- nally to a current amplifier and zero current comparator. This pin should Kelvin-connect to the current sense resis- tor (RSENSE) . CAOUT (Pin 22): Current Amplifier Output. A program resistor connects between this pin and PROGT (Pin 2) to set the charge current (in constant-current mode). OVP (Pin 23): Overvoltage Protection. This pin connects to the tap on an optional external voltage divider con- nected across the battery. This allows nonstandard float voltages to be used for the battery charger. Overvoltage, restart and undervoltage thresholds will also be affected by the external voltage division ratio. To use this pin, BATT1 (Pin 9) must float. SS (Pin 24): Soft-Start. A capacitor between this pin and ground sets the battery charge ramp rate. Battery charge current is very low the moment after the converter switches from DC/DC converter (regulator) mode to battery charger mode then ramps up to final battery charge current from there. This insures that the wall adapter is not loaded down with a large inrush current that could prevent correct battery charger operation. The same capacitor, which sets the soft-start ramp rate, also sets the compensation for the battery float voltage control loop. PI FU CTIO S |
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