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LTC3769 Datasheet(PDF) 9 Page - Linear Technology |
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LTC3769 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 32 page  LTC3769 9 3769f For more information www.linear.com/LTC3769 pin FuncTions (QFN/TSSOP) input determines how the LTC3769 operates at light loads. Pulling this pin to ground selects Burst Mode operation. An internal 100k resistor to ground also invokes Burst Mode operation when the pin is floated. Tying this pin to INTVCC forces continuous inductor current operation. Tying this pin to a voltage greater than 1.2V and less than INTVCC – 1.3V selects pulse-skipping operation. This can be done by adding a 100k resistor between the PLLIN/ MODE pin and INTVCC. RUN (Pin 11/Pin 6): Run Control Input. Forcing this pin below 1.28V shuts down the controller. Forcing this pin below 0.7V shuts down the entire LTC3769, reducing quiescent current to approximately 4µA. An external resistor divider connected to VIN can set the threshold for converter operation. Once running, a 4.5µA current is sourced from the RUN pin allowing the user to program hysteresis using the resistor values. SS (Pin 12/Pin 7): Output Soft-Start Input. A capacitor to ground at this pin sets the ramp rate of the output voltage during start-up. SENSE+(Pin13/Pin9):PositiveCurrentSenseComparator Input. The (+) input to the current comparator is normally connected to the positive terminal of a current sense resis- tor. The current sense resistor is normally placed at the input of the boost controller in series with the inductor. This pin also supplies power to the current comparator. The common mode voltage range on SENSE+ and SENSE– pins is 2.3V to 60V (65V abs max). SENSE–(Pin14/Pin8):NegativeCurrentSenseComparator Input. The (–) input to the current comparator is normally connected to the negative terminal of a current sense resistor connected in series with the inductor. VFB (Pin 15/Pin 10): Error Amplifier Feedback Input. This pin receives the remotely sensed feedback voltage from an external resistive divider connected across the output. ITH (Pin 16/Pin 11): Current Control Threshold and Error AmplifierCompensationPoint.Thevoltageonthispinsets the current trip threshold. OVMODE (Pin 17/Pin 12): Overvoltage Mode Selection Input. This pin is used to select how the LTC3769 operates when the output feedback voltage (VFB) is overvoltage (>110% of its normal regulated point of 1.2V). It is also used to determine the light-load mode of operation when the LTC3769 is synchronized to an external clock through the PLLIN/MODE pin. When OVMODE is tied to ground, overvoltage protection is enabled and the top MOSFET gate (TG) is turned on continuously until the overvoltage condition is cleared. When OVMODE is grounded, the LTC3769 operates in forced continuous mode when synchronized. There is an internal weak pull-down resistor that pulls the OVMODE pin to ground when it is left floating. When OVMODE is tied to INTVCC, overvoltage protection is disabled and TG is not forced on during an overvolt- age event. Instead, the state of TG is determined by the mode of operation selected by the PLLIN/MODE pin and the inductor current. See the Operation section for more details. When OVMODE is tied to INTVCC, the LTC3769 operates in pulse-skipping mode when synchronized. SW (Pin 18/Pin 13): Switch Node. Connect to the source of the synchronous N-channel MOSFET, the drain of the main N-channel MOSFET and the inductor. TG (Pin 19/Pin 14): Top Gate. Connect to the gate of the synchronous N-channel MOSFET. BOOST (Pin 20/Pin 15): Floating power supply for the synchronous N-channel MOSFET. Bypass to SW with a capacitor and supply with a Schottky diode connected to INTVCC. BG (Pin 21/Pin 16): Bottom Gate. Connect to the gate of the main N-channel MOSFET. EXTVCC(Pin23/Pin18):ExternalPowerInputtoaninternal LDOConnectedtoINTVCC.ThisLDOsuppliesINTVCCpower, bypassing the internal LDO powered from VBIASwhenever EXTVCC is higher than 4.7V. See EXTVCC Connection in the Applications Information section. Do not float or exceed 14V on this pin. Connect to ground if not used. |
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Similar Description - LTC3769_15 |
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