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LTC3788EUH Datasheet(PDF) 9 Page - Linear Technology |
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LTC3788EUH Datasheet(HTML) 9 Page - Linear Technology |
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9 / 32 page  LTC3788 9 3788f TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS SENSE1–, SENSE2– (Pin 1, Pin 9): Negative Current Sense Comparator Input. The (–) input to the current comparator is normally connected to the negative terminal of a cur- rent sense resistor connected in series with the inductor. The common mode voltage range on these pins is 2.5V to 38V (abs max). FREQ (Pin 2): The frequency control pin for the internal VCO. Connecting the pin to GND forces the VCO to a fixed low frequency of 350kHz. Connecting the pin to INTVCC forces the VCO to a fixed high frequency of 535kHz. The frequency can be programmed from 50kHz to 900kHz by connecting a resistor from the FREQ pin to GND. The resistor and an internal 20μA source current create a volt- age used by the internal oscillator to set the frequency. Alternatively, this pin can be driven with a DC voltage to vary the frequency of the internal oscillator. PHASMD (Pin 3): This pin can be floated, tied to SGND, or tied to INTVCC to program the phase relationship between the rising edges of BG1 and BG2, as well as the phase relationship between BG1 and CLKOUT. CLKOUT (Pin 4): A Digital Output Used for Daisychaining Multiple LTC3788 ICs in Multiphase Systems. The PHASMD pin voltage controls the relationship between BG1, BG2 and CLKOUT. This pin swings between SGND and INTVCC. PLLIN/MODE (Pin 5): Forced Continuous Mode, Burst Mode or Pulse-Skipping Mode Selection Pin and External Synchronization Input to Phase Detector Pin. Pulling this pin to ground selects Burst Mode operation. 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. A clock on the pin will force the controller into pulse-skipping mode of operation and synchronize the internal oscillator. SGND (Pin 6): Signal Ground. All small-signal components and compensation components should connect to this ground, which in turn connects to PGND at a single point. RUN1, RUN2 (Pin 7, Pin 8): Run Control Input. An external resistor divider connects to VIN and sets the thresholds for converter operation with a threshold of 1.28V. Once running, a 4.5μA current is sourced from the RUN pin allowing the user to program hysteresis using the resistor values. Maximum Current Sense Threshold vs Duty Cycle Charge Pump Charging Current vs Operating Frequency DUTY CYCLE (%) 0 80 100 70 60 40 20 40 10 90 30 50 80 60 100 20 0 120 3788 G25 ILIM = INTVCC ILIM = FLOAT ILIM = GND OPERATING FREQUENCY (kHz) 50 0 20 30 80 50 250 450 550 10 60 70 40 150 350 650 750 3788 G26 T = 130°C T = 25°C T = – 45°C VSW = 12V VBOOST – VSW = 4.5V |
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