Datasheet LTC4012, LTC4012-1, LTC4012-2 (Analog Devices) - 8
| Manufacturer | Analog Devices |
| Description | High Efficiency, Multi-Chemistry Battery Charger with PowerPath Control |
| Pages / Page | 28 / 8 — CLN (Pin 1):. ICL (Pin 8):. FB (Pin 9, LTC4012):. CLP (Pin 2):. INFET … |
| File Format / Size | PDF / 395 Kb |
| Document Language | English |
CLN (Pin 1):. ICL (Pin 8):. FB (Pin 9, LTC4012):. CLP (Pin 2):. INFET (Pin 3):. FVS0 (Pin 9, LTC4012-1/LTC4012-2):
Model Line for this Datasheet
Text Version of Document
LTC4012/ LTC4012-1/LTC4012-2 pin Functions
CLN (Pin 1):
Adapter Input Current Limit Negative Input.
ICL (Pin 8):
Active-Low Input Current Limit Indicator Out- The LTC4012 senses voltage on this pin to determine if put. This open-drain output pulls to GND when the charge less charge current should be sourced to limit total input current is reduced because of AC adapter input current current. The threshold is set 100mV below the CLP pin. An limiting. This output should be left floating if not used. external filter should be used to remove switching noise.
V
This input should be tied to CLP if not used. Operating
FB (Pin 9, LTC4012):
Battery Voltage Feedback Input. An external resistor divider between FBDIV and GND with the voltage range is (CLP – 110mV) to CLP. center tap connected to VFB programs the charger output
CLP (Pin 2):
Adapter Input Current Limit Positive Input. voltage. In constant voltage mode, this pin is nominally The LTC4012 also draws power from this pin, including at 1.2085V. Refer to the Applications Information section a small amount for some shutdown functions. Operating for complete details on programming battery voltage. voltage range is GND to 28V. Operating voltage range is GND to 1.25V.
INFET (Pin 3):
PowerPath Control Output. This output
FVS0 (Pin 9, LTC4012-1/LTC4012-2):
Battery Voltage drives the gate of a PMOS pass transistor connected Select Input (LSB). This pin is one of two pins used on the between the DC input (DCIN) and the raw system supply LTC4012-1 or LTC4012-2 to select one of four preset battery rail (CLP) to maintain a forward voltage of 25mV when a voltages. Selection is done by connecting to either GND or DC input source is present. INFET is internally clamped INTVDD. Operating voltage range is GND to INTVDD. about 6V below CLP. Maximum operating voltage is CLP,
FBDIV (Pin 10, LTC4012):
Battery Voltage Feedback which is used to turn off the input PMOS transistor when Resistor Divider Source. The LTC4012 connects this pin the DC input is removed. to BAT when charging is in progress. FBDIV is an open-
DCIN (Pin 4):
DC Sense Input. One of two voltage sense drain PFET output to BAT with an operating voltage range inputs to the internal PowerPath controller (the other input of GND to BAT. to the controller is CLP). This input is usually supplied
FVS1 (Pin 10, LTC4012-1/LTC4012-2):
Battery Voltage from an input DC power source. Operating voltage ranges Select Input (MSB). This pin is one of two pins used on from GND to 28.2V. the LTC4012-1 or LTC4012-2 to select one of four preset
ACP (Pin 5):
Active-Low AC Adapter Present Indicator battery voltages. Selection is done by connecting to Output. This open-drain output pul s to GND when adequate either GND or INTVDD. Operating voltage range is GND AC adapter (DCIN) voltage is present. This output should to INTVDD. be left floating if not used.
BAT (Pin 11):
Battery Pack Connection. The LTC4012 uses
SHDN
(
Pin 6):
Active-low Shutdown Input. Driving SHDN the voltage on this pin to control PWM operation when below 300mV unconditionally forces the LTC4012 into the charging. Operating voltage range is GND to CLN. shutdown state. This input has a 40kΩ internal pulldown
ITH (Pin 12):
PWM Control Voltage and Compensation to GND. Operating voltage range is GND to INTVDD. Node. The LTC4012 develops a voltage on this pin to
CHRG (Pin 7):
Active-Low Charge Indicator Output. This control cycle-by-cycle peak inductor current. An external open-drain output provides three levels of information R-C network connected to ITH provides PWM loop com- about charge status using a strong pull-down, 25µA weak pensation. Refer to the Applications Information section pull-down or high impedance. Refer to the Operation and for further details on establishing loop stability. Operating Applications Information sections for further details. This voltage range is GND to INTVDD. output should be left floating if not used. 4012fa Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Test Circuits Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
CLN (Pin 1):
Adapter Input Current Limit Negative Input.
ICL (Pin 8):
Active-Low Input Current Limit Indicator Out- The LTC4012 senses voltage on this pin to determine if put. This open-drain output pulls to GND when the charge less charge current should be sourced to limit total input current is reduced because of AC adapter input current current. The threshold is set 100mV below the CLP pin. An limiting. This output should be left floating if not used. external filter should be used to remove switching noise.
V
This input should be tied to CLP if not used. Operating
FB (Pin 9, LTC4012):
Battery Voltage Feedback Input. An external resistor divider between FBDIV and GND with the voltage range is (CLP – 110mV) to CLP. center tap connected to VFB programs the charger output
CLP (Pin 2):
Adapter Input Current Limit Positive Input. voltage. In constant voltage mode, this pin is nominally The LTC4012 also draws power from this pin, including at 1.2085V. Refer to the Applications Information section a small amount for some shutdown functions. Operating for complete details on programming battery voltage. voltage range is GND to 28V. Operating voltage range is GND to 1.25V.
INFET (Pin 3):
PowerPath Control Output. This output
FVS0 (Pin 9, LTC4012-1/LTC4012-2):
Battery Voltage drives the gate of a PMOS pass transistor connected Select Input (LSB). This pin is one of two pins used on the between the DC input (DCIN) and the raw system supply LTC4012-1 or LTC4012-2 to select one of four preset battery rail (CLP) to maintain a forward voltage of 25mV when a voltages. Selection is done by connecting to either GND or DC input source is present. INFET is internally clamped INTVDD. Operating voltage range is GND to INTVDD. about 6V below CLP. Maximum operating voltage is CLP,
FBDIV (Pin 10, LTC4012):
Battery Voltage Feedback which is used to turn off the input PMOS transistor when Resistor Divider Source. The LTC4012 connects this pin the DC input is removed. to BAT when charging is in progress. FBDIV is an open-
DCIN (Pin 4):
DC Sense Input. One of two voltage sense drain PFET output to BAT with an operating voltage range inputs to the internal PowerPath controller (the other input of GND to BAT. to the controller is CLP). This input is usually supplied
FVS1 (Pin 10, LTC4012-1/LTC4012-2):
Battery Voltage from an input DC power source. Operating voltage ranges Select Input (MSB). This pin is one of two pins used on from GND to 28.2V. the LTC4012-1 or LTC4012-2 to select one of four preset
ACP (Pin 5):
Active-Low AC Adapter Present Indicator battery voltages. Selection is done by connecting to Output. This open-drain output pul s to GND when adequate either GND or INTVDD. Operating voltage range is GND AC adapter (DCIN) voltage is present. This output should to INTVDD. be left floating if not used.
BAT (Pin 11):
Battery Pack Connection. The LTC4012 uses
SHDN
(
Pin 6):
Active-low Shutdown Input. Driving SHDN the voltage on this pin to control PWM operation when below 300mV unconditionally forces the LTC4012 into the charging. Operating voltage range is GND to CLN. shutdown state. This input has a 40kΩ internal pulldown
ITH (Pin 12):
PWM Control Voltage and Compensation to GND. Operating voltage range is GND to INTVDD. Node. The LTC4012 develops a voltage on this pin to
CHRG (Pin 7):
Active-Low Charge Indicator Output. This control cycle-by-cycle peak inductor current. An external open-drain output provides three levels of information R-C network connected to ITH provides PWM loop com- about charge status using a strong pull-down, 25µA weak pensation. Refer to the Applications Information section pull-down or high impedance. Refer to the Operation and for further details on establishing loop stability. Operating Applications Information sections for further details. This voltage range is GND to INTVDD. output should be left floating if not used. 4012fa Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Test Circuits Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
