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LTC3370 Datasheet(PDF) 14 Page - Analog Devices |
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LTC3370 Datasheet(HTML) 14 Page - Analog Devices |
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14 / 28 page  LTC3376 14 Rev 0 For more information www.analog.com PIN FUNCTIONS PGOOD4 (Pin D7): Power Good Pin for Buck Regulator 4 (Active High). Open-drain output. This pin is driven low when Buck 4’s regulated output voltage falls below its PGOOD threshold or rises above its overvoltage thresh- old. PGOOD4 is also pulled low in the following scenarios: if the buck is disabled, if the buck is going through soft- start, if INTVCC is below the UVLO threshold, or if the LTC3376 is in OT. RT (Pin G5): Timing Resistor Pin for Setting Oscillator Frequency. This pin provides two modes of setting the switching frequency when not synchronizing to an exter- nal clock. Connecting a resistor from RT to GND sets the switching frequency based on the resistor value. If RT is tied to INTVCC the default internal 2MHz oscillator is used. Do not float. RUN1 (Pin C4): Enable Input for Buck Regulator 1. Active high. Do not float. RUN2 (Pin F4): Enable Input for Buck Regulator 2. Active high. In configurations where the Enable Input for Buck 2 is not used, tie RUN2 to GND. Do not float. RUN3 (Pin F5): Enable Input for Buck Regulator 3. Active high. In configurations where the Enable Input for Buck 3 is not used, tie RUN3 to GND. Do not float. RUN4 (Pin C5): Enable Input for Buck Regulator 4. Active high. In configurations where the Enable Input for Buck 4 is not used, tie RUN4 to GND. Do not float. SWA (Pin A2): Switch Node for Power Stage A. External inductor connects to this pin. SWB (Pin B1): Switch Node for Power Stage B. External inductor connects to this pin. SWC (Pin G1): Switch Node for Power Stage C. External inductor connects to this pin. SWD (Pin H2): Switch Node for Power Stage D. External inductor connects to this pin. SWE (Pin H7): Switch Node for Power Stage E. External inductor connects to this pin. SWF (Pin G8): Switch Node for Power Stage F. External inductor connects to this pin. SWG (Pin B8): Switch Node for Power Stage G. External inductor connects to this pin. SWH (Pin A7): Switch Node for Power Stage H. External inductor connects to this pin. SYNC/MODE (Pin G3): Oscillator Synchronization and Mode Select Pin. Driving SYNC/MODE with an external clock signal synchronizes all switches to the applied fre- quency, and configures the buck converters to operate in forced continuous mode. Slope compensation automati- cally adapts to the external clock frequency. The absence of an external clock signal enables the frequency to be programmed by the RT pin. When not synchronizing to an external clock this input determines how the LTC3376 operates at light loads. Connecting this pin to ground selects Burst Mode operation. Connecting this pin to INTVCC selects forced continuous mode operation. Do not float. TEMP (Pin C7): Temperature Indication Pin. TEMP out- puts a voltage of 250mV (typical) at 25°C. The TEMP voltage changes by 10mV/°C (typical) giving an external indication of the LTC3376 internal die temperature. VCC (Pin B4): Internal Bias Supply. Bypass to GND with a 4.7µF or larger ceramic capacitor. VCC has to be present even when the EXTVCC pin is used and must come up before EXTVCC. VINA (Pin A3): Input Supply for Power Stage A. Bypass to PGNDA with a 1µF ceramic capacitor and 10µF or larger ceramic capacitor. VINB (Pin C1): Input Supply for Power Stage B. Bypass to PGNDB with a 1µF ceramic capacitor and 10µF or larger ceramic capacitor. VINC (Pin F1): Input Supply for Power Stage C. Bypass to PGNDC with a 1µF ceramic capacitor and 10µF or larger ceramic capacitor. |
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