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LTC4011EFE Datasheet(PDF) 6 Page - Linear Technology |
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LTC4011EFE Datasheet(HTML) 6 Page - Linear Technology |
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6 / 24 page  6 LTC4011 4011p PI FU CTIO S DCIN (Pin 1): DC Power Sense Input. The LTC4011 senses voltage on this pin to determine when an external DC power source is present. This input should be isolated from VCC by a blocking diode or PowerPath FET. Refer to the Applications Information section for complete details. Operating voltage range is GND to 34V. FAULT (Pin 2): Active-Low Fault Indicator Output. The LTC4011 indicates various battery and internal fault con- ditions by connecting this pin to GND. Refer to the Opera- tion and Applications Information sections for further details. This output is capable of driving an LED and should be left floating if not used. FAULT is an open-drain output to GND with an operating voltage range of GND to VCC. CHRG (Pin 3): Active-Low Charge Indicator Output. The LTC4011 indicates it is providing charge to the battery by connecting this pin to GND. Refer to the Operation and Applications Information sections for further details. This output is capable of driving an LED and should be left floating if not used. CHRG is an open-drain output to GND with an operating voltage range of GND to VCC. CHEM (Pin 4): Battery Chemistry Selection Input. This pin should be wired to GND to select NiMH fast charge termination parameters. If a voltage greater than 2.85V is applied to this pin, or it is left floating, NiCd parameters are used. Refer to the Applications Information section for further details. Operating voltage range is GND to 3.3V. GND (Pin 5): Ground. This pin provides a single-point ground for internal references and other critical analog circuits. VRT (Pin 6): Thermistor Network Termination Output. The LTC4011 provides 3.3V on this pin to drive an external thermistor network connected between VRT, VTEMP and GND. Additional power should not be drawn from this pin by the host application. VTEMP (Pin 7): Battery Temperature Input. An external thermistor network may be connected to VTEMP to pro- vide temperature-based charge qualification and addi- tional fast charge termination control. Charging may also be paused by connecting the VTEMP pin to GND. Refer to the Operation and Applications Information sections for complete details on external thermistor networks and charge control. If this pin is not used it should be wired to VRT. Operating voltage range is GND to 3.3V. VCELL (Pin 8): Average Single-Cell Voltage Input. An external voltage divider between BAT and VCDIV is attached to this pin to monitor the average single-cell voltage of the battery pack. The LTC4011 uses this information to pro- tect against catastrophic battery overvoltage and to con- trol 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 (Pin 9): Average Cell Voltage Resistor Divider Ter- mination. The LTC4011 connects this pin to GND provided the charger is not in shutdown. VCDIV is an open-drain output to GND with an operating voltage range of GND to BAT. TIMER (Pin 10): 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 11): 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 12): Battery Pack Connection. The LTC4011 uses the voltage on this pin to control current sourced from VCC to the battery during charging. Allowable operating volt- age range is GND to VCC. TOC (Pin 13): Active-Low Top-Off Charge Indicator Out- put. The LTC4011 indicates the top-off charge state for NiMH batteries by connecting this pin to GND. Refer to the Operation and Applications Information sections for fur- ther details. This output is capable of driving an LED and should be left floating if not used. TOC is an open-drain output to GND with an operating voltage range of GND to VCC. |
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