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LTC3802EUH Datasheet(PDF) 10 Page - Linear Technology |
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LTC3802EUH Datasheet(HTML) 10 Page - Linear Technology |
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10 / 28 page  LTC3802 10 3802f PI FU CTIO S (28-Pin SSOP/32-Pin QFN Package) PHASEMD (Pin 17/Pin 15): Phase Selector Input. This pin determines the phase relationships between controller 1, controller 2 and the PLLIN signal. When PHASEMD is floating, its value is around 2V, and the internal phase- locked loop synchronizes the falling edge of TG1 to the falling edge of the PLLIN signal. When PHASEMD is forced high, PLLIN leads TG1 by 90 °.TG1andTG2remainat180° out of phase independent of the PHASEMD input. When PHASEMD is forced low, an internal current source dis- charges the RUN/SS slowly to provide power down track- ing. Avoid coupling noise into this sensitive pin. FB2 (Pin 18/Pin 16): Channel 2 Controller Error Amplifier Input. See FB1. COMP2 (Pin 19/Pin 17): Channel 2 Controller Error Am- plifier Output. See COMP1. VCC (Pin 20/Pin 18): Power Supply Input. All the internal circuits except the switcher output drivers are powered from this pin. VCC should be connected to a low noise 5V supply and should be bypassed to SGND with at least a 10 µF capacitor in close proximity to the LTC3802. CMPIN2 (Pin 21/Pin 19): Channel 2 Controller Compara- tors Input. See CMPIN1. IMAX2 (Pin 22/Pin 20): Channel 2 Controller Current Limit Set. See IMAX1. PLLLPF (Pin 23/Pin 21): Phase-Locked Loop Lowpass Filter. The phase-locked loop’s lowpass filter is tied to this pin. Alternatively, this pin can be driven with an AC or DC voltage source to vary the frequency of the internal oscillator. PLLIN (Pin 24/Pin 22): Phase-Locked Loop Input/Exter- nal Synchronization Input to the Phase Detector. The falling edge of this signal is used for frequency synchro- nization. When PLLIN floats or shorts to ground, the controllers free run at 550kHz. SW2 (Pin 25/Pin 25): Channel 2 Controller Switching Node. See SW1. TG2 (Pin 26/Pin 26): Channel 2 Controller Top Gate Drive. See TG1. BOOST2 (Pin 27/Pin 27): Channel 2 Controller Top Gate Driver Supply. See BOOST1. BG2 (Pin 28/Pin 28): Channel 2 Controller Bottom Gate Drive. See BG1. Exposed Pad (Pin 33, QFN Package Only): Exposed Pad is PGND, must be soldered to PCB. |
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