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LTC4010CFE Datasheet(PDF) 8 Page - Linear Technology |
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LTC4010CFE Datasheet(HTML) 8 Page - Linear Technology |
8 / 24 page LTC4010 4010fb pin FuncTions GND (Pin 4): Ground. This pin provides a single-point ground for internal references and other critical analog circuits. VTEMP (Pin 5): Battery Temperature Input. An external 10k NTC thermistor may be connected between VTEMP and GND to provide temperature-based charge qualification and additional fast charge termination control. Charging may also be paused by connecting the VTEMP pin to GND. Refer to the Operation and Applications Information sec- tions for complete details on external thermistor networks and charge control. If this pin is not used it should be wired to GND through 10k. Operating voltage range is GND to 3.3V. VCELL(Pin6):AverageSingle-CellVoltageInput.Anexternal voltage divider between BAT and VCDIV is attached to this pin to monitor the average single-cell voltage of the bat- tery pack. The LTC4010 uses this information to protect against catastrophic battery overvoltage and to control the charging state. Refer to the Applications Information section for further details on the external divider network. Operating voltage range is GND to BAT. VCDIV(Pin7):AverageCellVoltageResistorDividerTermi- nation.TheLTC4010connectsthispintoGNDprovidedthe charger is not in shutdown. VCDIV is an open-drain output to GND with an operating voltage range of GND to BAT. TIMER (Pin 8): Charge Timer Input. A resistor connected between TIMER and GND programs charge cycle timing limits. Refer to the Applications Information section for complete details. Operating voltage range is GND to 1V. SENSE (Pin 9): Charge Current Sense Input. An external resistor between this input and BAT is used to program charge current. Refer to the Applications Information section for complete details on programming charge current. Operating voltage ranges from (BAT – 50mV) to (BAT + 200mV). BAT (Pin 10): Battery Pack Connection. The LTC4010 uses the voltage on this pin to control current sourced from VCC to the battery during charging. Allowable operating voltage range is GND to VCC. INTVDD (Pin 11): Internal 5V Regulator Output. This pin provides a means of bypassing the internal 5V regulator used to power the BGATE output driver. Typically, power should not be drawn from this pin by the application circuit. Refer to the Application Information section for additional details. BGATE(Pin12):ExternalSynchronousN-channelMOSFET Gate Control Output. This output provides gate drive to an optional external NMOS power transistor switch used for synchronous rectification to increase efficiency in the step-down DC/DC converter. Operating voltage is GND to INTVDD. BGATE should be left floating if not used. PGND (Pin 13): Power Ground. This pin provides a return for switching currents generated by internal LTC4010 cir- cuits. Externally, PGND and GND should be wired together using a very low impedance connection. Refer to PCB Layout Considerations in the Applications Information section for additional grounding details. TGATE (Pin 14): External P-channel MOSFET Gate Control Output.ThisoutputprovidesgatedrivetoanexternalPMOS power transistor switch used in the DC/DC converter. Op- erating voltage range varies as a function of VCC. Refer to the Electrical Characteristics table for specific voltages. VCC (Pin 15): Power Input. External diodes normally connect either the DC input power supply or the battery to this pin. Refer to the Applications Information section for further details. Suggested applied voltage range is GND to 34V. READY (Pin 16): Active-Low Ready-to-Charge Output. The LTC4010 connects this pin to GND if proper operating voltages for charging are present. Refer to the Operation section for complete details on charge qualification. This output is capable of driving an LED and should be left floating if not used. READY is an open-drain output to GND with an operating voltage range of GND to VCC. ExposedPad(Pin17):Thispinprovidesenhancedthermal properties for the TSSOP. It must be soldered to the PCB copper ground to obtain optimum thermal performance. |
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