 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LTC4012IUF-3-TRPBF Datasheet(PDF) 8 Page - Linear Technology |
|
||||||||||||||||||||||||||||||
LTC4012IUF-3-TRPBF Datasheet(HTML) 8 Page - Linear Technology |
|
|
8 / 28 page  40123fb LTC4012-3 pin FuncTions CLN (Pin 1): Adapter Input Current Limit Negative Input. The LTC4012-3 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 LTC4012-3 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. GND (Pin 5): Ground. Internally connected to the Exposed Pad (package paddle). SHDN (Pin 6): Active-Low Shutdown Input. Driving SHDN below300mVunconditionallyforcestheLTC4012-3intothe shutdown state. This input has a 40kΩ internal pull-down 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): Battery Voltage Feedback Input. An external resistor divider between FBDIV and GND with the center tapconnectedtoVFBprogramsthechargeroutputvoltage. In constant voltage mode, this pin is nominally at 1.2085V. Refer to the Applications Information section for complete detailsonprogrammingbatteryvoltage.Operatingvoltage range is GND to 1.25V. FBDIV(Pin10):BatteryVoltageFeedbackResistorDivider Source. The LTC4012-3 connects this pin to BAT when chargingisinprogress.FBDIVisanopen-drainPFEToutput to BAT with an operating voltage range of GND to BAT. BAT (Pin 11): Battery Pack Connection. The LTC4012-3 usesthevoltageonthispintocontrolPWMoperationwhen charging. Operating voltage range is GND to CLN. ITH (Pin 12): PWM Control Voltage and Compensation Node. The LTC4012-3 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. PROG(Pin13):ChargeCurrentProgrammingandMonitor- ing Pin. An external resistance connected between PROG and GND, along with the current sense and PWM input resistors, programs the maximum charge current. The voltage on this pin can also provide a linearized indicator of charge current. Refer to the Applications Information section for complete details on current programming and monitoring. Operating voltage range is GND to INTVDD. CSN (Pin 14): Charge Current Sense Negative Input. Place an external input resistor (RIN, Figure 1) between this pin and the negative side of the charge current sense resistor. Operating voltage ranges from (BAT – 50mV) to (BAT + 200mV). CSP (Pin 15): Charge Current Sense Positive Input. Place an external input resistor (RIN, Figure 1) between this pin and the positive side of the charge current sense resistor. Operating voltage ranges from (BAT – 50mV) to (BAT + 200mV). |
Similar Part No. - LTC4012IUF-3-TRPBF |
|
Similar Description - LTC4012IUF-3-TRPBF |
|
|
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 |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
