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LTC4110EUHF-TR Datasheet(PDF) 9 Page - Linear Technology |
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LTC4110EUHF-TR Datasheet(HTML) 9 Page - Linear Technology |
9 / 52 page LTC4110 9 4110fa ACPb (Pin 13): AC Present Status Digital Output. Open- Drain N-MOSFET output is asserted low when the main supply is present as detected by the DCDIV pin and internal DCIN UVLO. VDIS (Pin 14): Battery Discharge Voltage Limit During Backup Program Input. Battery threshold voltage at which backup mode will terminate by turning off the isolation P-MOSFET with the BATID pin. Adjustable from external resistor string biased from VREF pin. For default threshold connect to GND pin. VCAL (Pin 15): Battery Voltage Limit During Calibra- tion Program Input. Battery threshold voltage at which calibration will terminate. Adjustable from external resistor string biased from VREF pin. For default threshold connect to GND pin. VCHG (Pin 16): Battery Float Voltage Program Input. Trims the float voltage during charging. Programmed from external resistor string biased from VREF pin. Connect to GND for default float voltage. VREF (Pin 17): Voltage Reference Output and Timing Pro- grammingInput.Providesatypicalvirtualreferenceof1.220V (VREF)foranexternalresistordividertiedbetweenthispinand GND that programs the VCHG, VCAL and VDIS pin functions. Total resistance from VREF to GND, along with the capacitor on the timer pin, programs the charge time. Voltage refer- ence output remains active in all modes except shutdown. Load current must be between 10μA and 25μA. TIMER (Pin 18): Charge Timing Input. A capacitor con- nected between TIMER and GND along with the resistance connected from VREF to GND programs the charge time intervals. TYPE (Pin 19): Refer to Table 8. THA (Pin 20): SafetySignal Force/Sense Pin to Smart Battery and Force Pin to Lead Acid Battery Thermistor. See description of operation for more detail. The maxi- mum allowed combined capacitance on THA, THB and SafetySignal is 1nF. For lead acid battery applications the maximum capacitance on the THA pin is 50pF. THB (Pin 21): SafetySignal Force/Sense Pin to Smart Battery and Sense Pin to Lead Acid Battery Thermistor. See description of operation for more detail. The maxi- mum allowed combined capacitance on THA, THB and SafetySignal is 1nF. IPCC (Pin 22): Battery Preconditioning Charge Current Program Input. Programs the battery current during preconditioning or wakeup charging. Programmed from external resistor to GND. ICAL (Pin 23): Battery Discharge Current During Calibration Program Input. Programs the constant discharge current at the battery during calibration. Programmed from external resistor to GND. ICHG(Pin24):BatteryCurrentDuringChargeProgramInput. Programs the battery current while constant-current bulk charging. Programmed from external resistor to GND. ITH (Pin 25): Control Signal of the Current Mode PWM. AC compensates control loop. Higher ITH voltage corresponds to higher charging current. CSP (Pin 26): Current Sense Positive Input. This pin and the CSN pin measure voltage across the external current sense resistor to control battery current during charging and calibration. CSN (Pin 27): Current Sense Negative Input. This pin and the CSP pin measure voltage across the external current sense resistor to control battery current during charging and calibration. SGND (Pin 28): Signal Ground Reference Input. This pin should be Kelvin connected to the flyback current sense resistor and to the battery return. ISENSE (Pin 29): Current Sense Input. Senses current in the flyback transformer by monitoring voltage across the external current sense resistor. This pin should be Kelvin- connected to the resistor. SELC (Pin 30): Refer to Table 8. PIN FUNCTIONS |
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