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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC3370 датащи(PDF) 13 Page - Analog Devices |
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LTC3370 датащи(HTML) 13 Page - Analog Devices |
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13 / 28 page  LTC3376 13 Rev 0 For more information www.analog.com PIN FUNCTIONS IMON3 (Pin E6): Current Monitor Pin for Buck Regulator 3. IMON3 outputs a current of 100µA (typical) at 1.5A load current for each power stage configured. Connect a resistor from IMON3 to GND. The value of this resistor should be chosen so that IMON3 is 1V at full load (1.5A per power stage). The IMON3 voltage will decrease by 0.67V/A at lower load currents. The IMON3 output current will be 0 when the regulator is sleeping in Burst Mode or is disabled. IMON4 (Pin D6): Current Monitor Pin for Buck Regulator 4. IMON4 outputs a current of 100µA (typical) at 1.5A load current for each power stage configured. Connect a resistor from IMON4 to GND. The value of this resistor should be chosen so that IMON4 is 1V at full load (1.5A per power stage). The IMON4 voltage will decrease by 0.67V/A at lower load currents. The IMON4 output current will be 0 when the regulator is sleeping in Burst Mode or is disabled. INTVCC (Pin B3): Internal 3V VCC Regulator Bypass Pin. The control circuits are powered from this voltage. Do not load the INTVCC pin with external circuitry exceeding 2mA. If overloaded the LTC3376 will shut down. INTVCC cur- rent is supplied from EXTVCC if VEXTVCC > 3V, otherwise current is drawn from VCC. Bypass to GND with a single 4.7µF or larger low ESR ceramic capacitor. INTVCC_P (Pin B6): Internal VCC Power Stage Supply. The internal power drivers are powered from this voltage. The INTVCC_P pin is for internal use only. Bypass to GND with a single 10µF or larger low ESR ceramic capacitor. In all applications, INTVCC_P must connect to INTVCC. PGNDA (Pin A4): Ground Supply for Power Stage A. Connect the GND side of the VINA bypass capacitors directly to this pin and then to the ground plane. PGNDB (Pin D1): Ground Supply for Power Stage B. Connect the GND side of the VINB bypass capacitors directly to this pin and then to the ground plane. PGNDC (Pin E1): Ground Supply for Power Stage C. Connect the GND side of the VINC bypass capacitors directly to this pin and then to the ground plane. PGNDD (Pin H4): Ground Supply for Power Stage D. Connect the GND side of the VIND bypass capacitors directly to this pin and then to the ground plane. PGNDE (Pin H5): Ground Supply for Power Stage E. Connect the GND side of the VINE bypass capacitors directly to this pin and then to the ground plane. PGNDF (Pin E8): Ground Supply for Power Stage F. Connect the GND side of the VINF bypass capacitors directly to this pin and then to the ground plane. PGNDG (Pin D8): Ground Supply for Power Stage G. Connect the GND side of the VING bypass capacitors directly to this pin and then to the ground plane. PGNDH (Pin A5): Ground Supply for Power Stage H. Connect the GND side of the VINH bypass capacitors directly to this pin and then to the ground plane. PGOOD1 (Pin D2): Power Good Pin for Buck Regulator 1 (Active High). Open-drain output. This pin is driven low when Buck 1’s regulated output voltage falls below its PGOOD threshold or rises above its overvoltage thresh- old. PGOOD1 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. PGOOD2 (Pin E2): Power Good Pin for Buck Regulator 2 (Active High). Open-drain output. This pin is driven low when Buck 2’s regulated output voltage falls below its PGOOD threshold or rises above its overvoltage thresh- old. PGOOD2 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. PGOOD3 (Pin E7): Power Good Pin for Buck Regulator 3 (Active High). Open-drain output. This pin is driven low when Buck 3’s regulated output voltage falls below its PGOOD threshold or rises above its overvoltage thresh- old. PGOOD3 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. |
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