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LTC3850IGN-1-TRPBF Datasheet(PDF) 9 Page - Linear Technology |
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LTC3850IGN-1-TRPBF Datasheet(HTML) 9 Page - Linear Technology |
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9 / 36 page  LTC3850/LTC3850-1 9 38501fb PIN FUNCTIONS RUN1, RUN2 (Pins 1, 13/Pins 26, 9/Pins 27, 10): Run Control Inputs. A voltage above 1.2V on either pin turns on the IC. However, forcing either of these pins below 1.2V causes the IC to shut down that particular channel. There are 0.5μA pull-up currents for these pins. Once the RUN pin rises above 1.2V, an additional 4.5μA pull-up current is added to the pin. SENSE1+, SENSE2+ (Pins 2, 12/Pins 27, 8/Pins 28, 9): Current Sense Comparator Inputs. The (+) inputs to the current comparators are normally connected to DCR sens- ing networks or current sensing resistors. SENSE1–, SENSE2– (Pins 3, 11/Pins 28, 7/Pins 1, 8): Current Sense Comparator Inputs. The (–) inputs to the current comparators are connected to the outputs. TK/SS1, TK/SS2 (Pins 4, 10/Pins 1, 6/Pins 2, 7): Output Voltage Tracking and Soft-Start Inputs. When one channel is configured to be master of the two channels, a capaci- tor to ground at this pin sets the ramp rate for the master channel’s output voltage. When the channel is configured to be the slave of two channels, the VFB voltage of the master channel is reproduced by a resistor divider and applied to this pin. Internal soft-start currents of 1.3μA charge the soft-start capacitors. ITH1, ITH2 (Pins 5, 9/Pins 2, 5/Pins 3, 6): Current Control Thresholds and Error Amplifier Compensation Points. Each associated channels’ current comparator tripping threshold increases with its ITH control voltage. VFB1, VFB2 (Pins 6, 8/Pins 3, 4/Pins 4, 5): Error Amplifier Feedback Inputs. These pins receive the remotely sensed feedback voltages for each channel from external resistive dividers across the outputs. SGND (Pin 7/Pin 29/Pin 29): Signal Ground. All small- signal components and compensation components should connect to this ground, which in turn connects to PGND at one point. Pin 29 is the Exposed Pad, only available on the UF package. EXTVCC (Pin 14, LTC3850-1 Only/Pin 11/Pin 12): External Power Input to an Internal Switch Connected to INTVCC. This switch closes and supplies the IC power, bypassing the internal low dropout regulator, whenever EXTVCC is higher than 4.7V. Do not exceed 6V on this pin and ensure VIN > VEXTVCC at all times. On the GN package, EXTVCC is the optional bonding in place of ILIM for LTC3850-1. In the LTC3850-1, ILIM will default to 50mV. ILIM (Pin 14, LTC3850 Only/Pin 10/Pin 11): Current Comparator Sense Voltage Range Inputs. Tying this pin to SGND, FLOAT or INTVCC sets the maximum current sense threshold to three different levels for each comparator. PGOOD (Pin 15/Pin 12/Pin 13): Power Good Indicator Output. Open-drain logic out that is pulled to ground when eitherchanneloutputexceedsthe±7.5%regulationwindow, after the internal 17μs power bad mask timer expires. PGND (Pin 19/Pin 16/Pin 17): Power Ground Pin. Connect this pin closely to the sources of the bottom N-channel MOSFETs, the (–) terminal of CVCC and the (–) terminal of CIN. INTVCC(Pin21/Pin18/Pin19):Internal5VRegulatorOutput. The control circuits are powered from this voltage. Decouple this pin to PGND with a 4.7μF low ESR tantalum or ceramic capacitor. VIN (Pin 22/Pin 19/Pin 20): Main Input Supply. Decouple this pin to PGND with a capacitor (0.1μF to 1μF). For ap- plications where the main input power is 5V, tie the VIN and INTVCC pins together. BG1, BG2 (Pins 23, 20/Pins 20, 17/Pins 21, 18): Bottom Gate Driver Outputs. These pins drive the gates of the bottom N-Channel MOSFETs and swings between PGND and INTVCC. BOOST1, BOOST2 (Pins 24, 18/Pins 21, 15/Pins 22, 16): Boosted Floating Driver Supplies. The (+) terminal of the boost-strap capacitors connect to these pins. These pins swing from a diode voltage drop below INTVCC up to VIN + INTVCC. TG1, TG2 (Pins 25, 17/Pins 22, 14/Pins 23, 15): Top Gate Driver Outputs. These are the outputs of floating drivers with a voltage swing equal to INTVCC superimposed on the switch nodes voltages. SW1, SW2 (Pins 26, 16/Pins 23, 13/Pins 24, 14): Switch Node Connections to Inductors. Voltage swing at these pins are from a body diode voltage drop below ground to VIN. (GN/UF/UFD) |
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