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LTC4010CFETRPBF Datasheet(PDF) 10 Page - Linear Technology |
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LTC4010CFETRPBF Datasheet(HTML) 10 Page - Linear Technology |
10 / 24 page LTC4010 0 4010fb Shutdown State The LTC4010 remains in micropower shutdown until VCC (Pin 15) is driven above BAT (Pin 10). In shutdown all status and PWM outputs and internally generated supply voltages are inactive. Current consumption from VCC and BAT is reduced to a very low level. Charge Qualification State OnceVCCisgreaterthanBAT,theLTC4010exitsmicropower shutdown, enables its own internal supplies and switches VCDIV to GND to allow measurement of the average single- cell voltage. The IC also verifies that VCCisatorabove4.2V, VCCis510mVaboveBATandVCELLisbetween350mVand 1.95V. If VCELL is below 350mV, no charging will occur, and if VCELL is above 1.95V, the fault state is entered, which is described in more detail below. Once adequate voltage conditions exist for charging, READY is asserted. If the voltage between VTEMP and GND is below 200mV, the LTC4010 is paused. If VTEMP is above 200mV but below 2.85V, the LTC4010 verifies that the sensed temperature is between 5°C and 45°C. If these temperature limits are not met or if its own die temperature is too high, the LTC4010 will indicate a fault and not allow charging to begin. If VTEMP is greater than 2.85V, battery temperature related charge qualification, monitoring and termination are disabled. Once charging is fully qualified, precharge begins (unless the LTC4010 is paused). In that case, the VTEMP pin is monitoredforfurthercontrol.Thechargestatusindicators and PWM outputs remain inactive until charging begins. Charge Monitoring The LTC4010 continues to monitor important voltage and temperature parameters during all charging states. If VCC drops to the BAT voltage or lower, charging stops and the shutdown state is entered. If VCC drops below 4.25V or VCELLdropsbelow350mV,chargingstopsandtheLTC4010 returns to the charge qualification state. If VCELL exceeds 1.95V, charging stops and the IC enters the fault state. If an externalthermistorindicatessensedtemperatureisbeyond a range of 5°C to 60°C, or the internal die temperature exceeds a resonable value, charging is suspended, the charge timer is paused and the LTC4010 indicates a fault condition. Normal charging resumes from the previous statewhenthesensedtemperaturereturnstoasatisfactory range. In addition, other battery faults are detected during specific charging states as described below. Precharge State If the initial voltage on VCELL is below 900mV, the LTC4010 enters the precharge state and enables the PWM current source to trickle charge using one-fifth the programmed charge current. The CHRG status output is active during precharge. The precharge state duration is limited to tMAX/12 minutes, where tMAX is the maximum fast charge period programmed with the TIMER pin. If sufficient VCELL voltage cannot be developed in this length of time, the fault state is entered, otherwise fast charge begins. Fast Charge State If adequate average single-cell voltage exists, the LTC4010 enters the fast charge state and begins charging at the programmed current set by the external current sense resistor connected between the SENSE and BAT pins. The CHRG status output is active during fast charge. If VCELL is initially above 1.325V, voltage-based termination processingbeginsimmediately.Otherwise–∆Vtermination is disabled for a stabilization period of tMAX/12. In that case, the LTC4010 makes another fault check at tMAX/12, requiring the average cell voltage to be above 1.22V. This ensures the battery pack is accepting a fast charge. If VCELL is not above this voltage threshold, the fault state is entered. Fast charge state duration is limited to tMAX and the fault state is entered if this limit is exceeded. operaTion (Refer to Figure 1) |
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