Electronic Components Datasheet Search |
|
LTC4012CUFTRPBF Datasheet(PDF) 8 Page - Linear Technology |
|
LTC4012CUFTRPBF Datasheet(HTML) 8 Page - Linear Technology |
8 / 28 page LTC4012/ LTC4012-1/LTC4012-2 8 4012f PIN FUNCTIONS CLN (Pin 1): Adapter Input Current Limit Negative Input. The LTC4012 senses voltage on this pin to determine if less charge current should be sourced to limit total input current. The threshold is set 100mV below the CLP pin. An external filter should be used to remove switching noise. This input should be tied to CLP if not used. Operating voltage range is (CLP – 110mV) to CLP. CLP (Pin 2): Adapter Input Current Limit Positive Input. The LTC4012 also draws power from this pin, including a small amount for some shutdown functions. Operating voltage range is GND to 28V. INFET (Pin 3): PowerPath Control Output. This output drives the gate of a PMOS pass transistor connected between the DC input (DCIN) and the raw system supply rail (CLP) to maintain a forward voltage of 25mV when a DC input source is present. INFET is internally clamped about 6V below CLP. Maximum operating voltage is CLP, which is used to turn off the input PMOS transistor when the DC input is removed. DCIN (Pin 4): DC Sense Input. One of two voltage sense inputs to the internal PowerPath controller (the other input to the controller is CLP). This input is usually supplied from an input DC power source. Operating voltage ranges from GND to 28.2V. ACP (Pin 5): Active-Low AC Adapter Present Indicator Output. This open-drain output pulls to GND when adequate AC adapter (DCIN) voltage is present. This output should be left floating if not used. SHDN (Pin 6): Active-low Shutdown Input. Driving SHDN below 300mV unconditionally forces the LTC4012 into the shutdown state. This input has a 40kΩ internal pulldown to GND. Operating voltage range is GND to INTVDD. CHRG (Pin 7): Active-Low Charge Indicator Output. This open-drain output provides three levels of information about charge status using a strong pull-down, 25μA weak pull-down or high impedance. Refer to the Operation and Applications Information sections for further details. This output should be left floating if not used. ICL (Pin 8): Active-Low Input Current Limit Indicator Out- put. This open-drain output pulls to GND when the charge current is reduced because of AC adapter input current limiting. This output should be left floating if not used. VFB (Pin 9, LTC4012): Battery Voltage Feedback Input. An external resistor divider between FBDIV and GND with the center tap connected to VFB programs the charger output voltage. In constant voltage mode, this pin is nominally at 1.2085V. Refer to the Applications Information section for complete details on programming battery voltage. Operating voltage range is GND to 1.25V. FVS0 (Pin 9, LTC4012-1/LTC4012-2): Battery Voltage Select Input (LSB). This pin is one of two pins used on the LTC4012-1 or LTC4012-2 to select one of four preset battery voltages. Selection is done by connecting to either GND or INTVDD. Operating voltage range is GND to INTVDD. FBDIV (Pin 10, LTC4012): Battery Voltage Feedback Resistor Divider Source. The LTC4012 connects this pin to BAT when charging is in progress. FBDIV is an open- drain PFET output to BAT with an operating voltage range of GND to BAT. FVS1 (Pin 10, LTC4012-1/LTC4012-2): Battery Voltage Select Input (MSB). This pin is one of two pins used on the LTC4012-1 or LTC4012-2 to select one of four preset battery voltages. Selection is done by connecting to either GND or INTVDD. Operating voltage range is GND to INTVDD. BAT (Pin 11): Battery Pack Connection. The LTC4012 uses the voltage on this pin to control PWM operation when charging. Operating voltage range is GND to CLN. ITH (Pin 12): PWM Control Voltage and Compensation Node. The LTC4012 develops a voltage on this pin to control cycle-by-cycle peak inductor current. An external R-C network connected to ITH provides PWM loop com- pensation. Refer to the Applications Information section for further details on establishing loop stability. Operating voltage range is GND to INTVDD. |
Similar Part No. - LTC4012CUFTRPBF |
|
Similar Description - LTC4012CUFTRPBF |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |