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LTC4009CUF-TRPBF Datasheet(PDF) 8 Page - Linear Technology |
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LTC4009CUF-TRPBF Datasheet(HTML) 8 Page - Linear Technology |
8 / 28 page LTC4009 LTC4009-1/LTC4009-2 8 4009fb PIN FUNCTIONS FVS0 (Pin 9, LTC4009-1/LTC4009-2): Battery Voltage Select Input (LSB). This pin is one of two pins used on the LTC4009-1 or LTC4009-2 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. VFB (Pin 10, LTC4009): 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 float voltage. Operating voltage range is GND to 1.25V. FVS1 (Pin 10, LTC4009-1/LTC4009-2): Battery Voltage Select Input (MSB). This pin is one of two pins used on the LTC4009-1 or LTC4009-2 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 LTC4009 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 LTC4009 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 (Pin 13): Charge Current Programming and Monitor- 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 In- put. 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) be- tween this pin and the positive side of the charge current sense resistor. Operating voltage ranges from (BAT – 50mV) to (BAT + 200mV). BGATE (Pin 16): External Synchronous NFET Gate Control Output. This output provides gate drive to an external NMOS power transistor switch used for synchronous rectification to increase efficiency in the step-down DC/DC converter. Operating voltage is GND to INTVDD. BGATE should be left floating if not used. INTVDD (Pin 17): Internal 5V Regulator Output. This pin provides a means of bypassing the internal 5V regulator used to power the LTC4009 PWM FET drivers. This supply shuts down when the LTC4009 shuts down. Refer to the Application Information section for details if additional power is drawn from this pin by the application circuit. SW (Pin 18): PWM Switch Node. The LTC4009 uses the voltage on this pin as the source reference for its topside NFET (PWM switch) driver. Refer to the Applications In- formation section for additional PCB layout suggestions related to this critical circuit node. Operating voltage range is GND to CLN. TGATE (Pin 19): External NFET Switch Gate Control Output. This output provides gate drive to an external NMOS power transistor switch used in the DC/DC converter. Operating voltage range is GND to (CLN + 5V). BOOST (Pin 20): TGATE Driver Supply Input. A bootstrap capacitor is returned to this pin from a charge network connected to SW and INTVDD. Refer to the Applications Information section for complete details on circuit topol- ogy and component values. Operating voltage ranges from (INTVDD – 1V) to (CLN + 5V). Exposed Pad (Pin 21): Ground. The package paddle provides a single-point ground for the internal voltage reference and other critical LTC4009 circuits. It must be soldered to a suitable PCB copper ground pad for proper electrical operation and to obtain the specified package thermal resistance. |
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