Datasheet LTC4011 (Analog Devices) - 8

LTC4011 Typical perForMance characTerisTics
INTVDD Voltage INTVDD Short-Circuit Current
pin FuncTions
DCIN (Pin 1):
DC Power Sense Input. The LTC4011 senses
GND (Pin 5):
Ground. This pin provides a single-point voltage on this pin to determine when an external DC ground for internal references and other critical analog power source is present. This input should be isolated circuits. from VCC by a blocking diode or PowerPath FET. Refer to
V
the Applications Information section for complete details.
RT (Pin 6):
Thermistor Network Termination Output. The LTC4011 provides 3.3V on this pin to drive an external Operating voltage range is GND to 34V. thermistor network connected between VRT, VTEMP and
FAULT (Pin 2):
Active-Low Fault Indicator Output. The GND. Additional power should not be drawn from this pin LTC4011 indicates various battery and internal fault condi- by the host application. tions by connecting this pin to GND. Refer to the Operation
V
and Applications Information sections for further details.
TEMP (Pin 7):
Battery Temperature Input. An external thermistor network may be connected to V This output is capable of driving an LED and should be TEMP to provide temperature-based charge qualification and additional left floating if not used. FAULT is an open-drain output to fast charge termination control. Charging may also be GND with an operating voltage range of GND to VCC. paused by connecting the VTEMP pin to GND. Refer to
CHRG (Pin 3):
Active-Low Charge Indicator Output. The the Operation and Applications Information sections for LTC4011 indicates it is providing charge to the battery by complete details on external thermistor networks and connecting this pin to GND. Refer to the Operation and charge control. If this pin is not used it should be wired Applications Information sections for further details. This to VRT. Operating voltage range is GND to 3.3V. output is capable of driving an LED and should be left
V
floating if not used. CHRG is an open-drain output to GND
CELL (Pin 8):
Average Single-Cel Voltage Input. An exter- nal voltage divider between BAT and V with an operating voltage range of GND to V CDIV is attached to CC. this pin to monitor the average single-cel voltage of the
CHEM (Pin 4):
Battery Chemistry Selection Input. This battery pack. The LTC4011 uses this information to protect pin should be wired to GND to select NiMH fast charge against catastrophic battery overvoltage and to control termination parameters. If a voltage greater than 2.85V is the charging state. Refer to the Applications Information applied to this pin, or it is left floating, NiCd parameters section for further details on the external divider network. are used. Refer to the Applications Information section for Operating voltage range is GND to BAT. further details. Operating voltage range is GND to 3.3V. 4011fb Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Related Parts