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LTC3546 Datasheet(PDF) 9 Page - Linear Technology |
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LTC3546 Datasheet(HTML) 9 Page - Linear Technology |
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9 / 30 page  LTC3546 9 3546fc For more information www.linear.com/3546 pin FuncTions BMC2 (Pin 1/Pin 4): Burst Mode Clamp for Channel 2. Connecting this pin to an external voltage between 0V and 0.6V sets the Burst Mode clamp level. If this pin is pulled to VCCA, an internal Burst Mode clamp level is used. This pin should be tied to GND when Burst Mode operation is not selected. TRACK/SS2 (Pin 2/Pin 5): Tracking input for Channel 2 outputoroptionalexternalsoft-startinput.VOUT2willtrack an external voltage at this pin. Leaving this pin floating allows VOUT2 to start-up using the internal soft-start. An external soft-start can be programmed by connecting a capacitor between this pin and ground. External soft-start ramp time must be greater than the internal soft-start time of 1.2ms. Refer to the Applications Information section for more details. VFB2 (Pin 3/Pin 6): Feedback voltage from external resis- tive divider from the Channel 2 regulator output. Nominal voltage for this pin is 0.6V. ITH2(Pin4/Pin7):ErrorAmplifierCompensationforChan- nel 2 Regulator. Peak current increases with an increase in the voltage on this pin. Nominal voltage range for this pin is 0V to 1.5V. VCCD (Pin 5/Pin 8): Supply Pin for Internal Digital Cir- cuitry. RUN2 (Pin 6/Pin 9): Low Level Logic Input. Enable for Channel 2. When pulled high, regulator is running. When at 0V, regulator is off. When both RUN1 and RUN2 are at 0V the part is in shutdown. VIN2 (Pin 7/Pin 10): Supply pin for 2A P-channel switch which connects from VIN2 to SW2A/B. VIN1 (Pin 8/Pin 11): Supply pin for 1A P-channel switch which connects from VIN1 to SW1. VIN1D(Pin9/Pin12):Supplypinfor1AdependentP-chan- nel switch which connects from VIN1D to SW1D. SW2A (Pin 10/Pin 13): Half of the switch node connec- tion to the inductor for Channel 2. SW2A and SW2B must be externally tied together. This pin swings from VIN2 to PGND2. SW2B (Pin 11/Pin 14): Half of the switch node connec- tion to the inductor for Channel 2 SW2A and SW2B must be externally tied together. This pin swings from VIN2 to PGND2. SW1D (Pin 12/Pin 15): The Dependent Switch Node Connection. The pin is externally connected to SW1 for a 2A/2A regulator or to SW2A/B for a 3A/1A regulator. Internal circuitry detects which pin SW1D is externally connected to, SW1 or SW2A/B. This pin swings from VIN1D to PGND1D. SW1D switching will be controlled by the output switch to which it is connected, i.e., SW1 or SW2A/SW2B. The dependant 1A power stage can be disabled by floating the SW1D pin. The SW1D pin must never be connected to VIN or GND. When disabled, SW1D is pulled high internally. SW1 (Pin 13/Pin 16): The switch node connection to the Inductor for the Channel 1 regulator. This pin swings from VIN1 to PGND1. PGND1D (Pin 14/Pin 17): Ground for SW1D Switching N-Channel Driver. PGND1 (Pin 15/Pin 18): Ground for SW1 Switching N- Channel Driver. PGND2 (Pin 16/Pin 19): Ground for SW2A and SW2B Switching N-Channel Driver. RUN1 (Pin 17/Pin 20): Low Level Logic Input. Enable for Channel 1. When pulled high, regulator is running. When at 0V, regulator is off. When both RUN1 and RUN2 are at 0V the part is in shutdown. PHASE (Pin 18/Pin 21): Low Level Logic Input. Selects Channel 2 regulator switching phase with respect to Channel 1 regulator switching. When pulled high, the SW1 regulator and the SW2A/B regulator are in phase. When PHASE is at 0V the SW1 regulator and the SW2A/B regulator are switching 180° out-of-phase. ITH1 (Pin 19/Pin 22): Error Amplifier Compensation for Channel 1. Peak current increases with an increase in the voltage on this pin. Nominal voltage range for this pin is 0V to 1.5V. (UFD/FE) |
Similar Part No. - LTC3546_15 |
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Similar Description - LTC3546_15 |
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