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LTC3853IUJ-PBF Datasheet(PDF) 8 Page - Linear Technology |
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LTC3853IUJ-PBF Datasheet(HTML) 8 Page - Linear Technology |
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8 / 36 page  LTC3853 8 3853f PIN FUNCTIONS SENSE1+, SENSE2+, SENSE3+ (Pins 3, 5, 7): CurrentSense Comparator Inputs. The (+) inputs to the current compara- tors are normally connected to DCR sensing networks or current sensing resistors. SENSE3+ common modes up to 13.5V, allowing higher VOUT voltages on channel 3. SENSE1–, SENSE2–, SENSE3– (Pins 4, 6, 8): Current Sense Comparator Inputs. The (–) inputs to the current comparators are connected to the outputs. SENSE3– com- mon modes up to 13.5V, allowing higher VOUT voltages on channel 3. VFB1, VFB2, VFB3 (Pins 9, 12, 14): Error Amplifier Feedback Inputs. These pins receive the remotely sensed feedback voltages for each channel from external resistive dividers across the outputs. Connecting VFB2 to VIN through a 200k resistor enables dual output (2 + 1) mode. ITH1, ITH2, ITH3 (Pins 10, 13, 15): Current Control Thresh- olds and Error Amplifier Compensation Points. Each as- sociated channels’ current comparator tripping threshold increases with its ITH control voltage. In dual output (2 + 1) mode, ITH1 and ITH2 need to be shorted externally. SGND (Pin 11): Signal Ground. All small-signal compo- nents and compensation components should connect to this ground, which in turn connects to PGND at one point. PGOOD3 (Pin 16): Power Good Indicator Output for Phase 3. Open-drain logic out that is pulled to ground when any channel output exceeds the ±7.5% regulation window, after the internal 17μs power bad mask timer expires. PGOOD12 (Pin 17): Power Good Indicator Output for Phases 1 and 2. Open-drain logic out that is pulled to ground when any channel output exceeds the ±7.5% regulation window, after the internal 17μs power bad mask timer expires. INTVCC (Pin 22): Internal 5V Regulator Output. The control circuits are powered from this voltage. Also provides channel 3 driver power. Decouple this pin to PGND with a minimum of 4.7μF low ESR tantalum or ceramic capacitor. EXTVCC(Pin23):ExternalPowerInputtoanInternalSwitch 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. VIN (Pin 24): Main Input Supply. Decouple this pin to PGND with a capacitor (0.1μF to 1μF). DRVCC12 (Pin 29): Driver Voltage Input for Channels 1 and 2. Do not exceed 6V on this pin. This pin must be tied to INTVCC externally. BG1, BG2, BG3 (Pins 30, 28, 21): Bottom Gate Driver Outputs. These pins drive the gates of the bottom N-channel MOSFETs between PGND and INTVCC/DRVCC12. SW1, SW2, SW3 (Pins 31, 27, 20): Switch Node Con- nections to Inductors. Voltage swing at these pins is from a Schottky diode (external) voltage drop below ground to VIN. |
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