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LTC1628IG-PG Datasheet(PDF) 8 Page - Linear Technology |
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LTC1628IG-PG Datasheet(HTML) 8 Page - Linear Technology |
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8 / 32 page  8 LTC1628/LTC1628-PG RUN/SS1, RUN/SS2 (Pins 1, 15): Combination of soft- start, run control inputs and short-circuit detection timers. A capacitor to ground at each of these pins sets the ramp time to full output current. Forcing either of these pins back below 1.0V causes the IC to shut down the circuitry required for that particular controller. Latchoff overcurrent protection is also invoked via this pin as described in the Applications Information section. SENSE1+, SENSE2+ (Pins 2, 14): The (+) Input to the Differential Current Comparators. The Ith pin voltage and controlled offsets between the SENSE– and SENSE+ pins in conjunction with RSENSE set the current trip threshold. SENSE1–, SENSE2– (Pins 3, 13): The (–) Input to the Differential Current Comparators. VOSENSE1, VOSENSE2 (Pins 4, 12): Receives the remotely- sensed feedback voltage for each controller from an external resistive divider across the output. FREQSET (Pin 5): Frequency Control Input to the Oscilla- tor. This pin can be left open, tied to ground, tied to INTVCC or driven by an external voltage source. This pin can also be used with an external phase detector to build a true phase-locked loop. STBYMD (Pin 6): Control pin that determines which cir- cuitry remains active when the controllers are shut down and/or provides a common control point to shut down both controllers. See the Operation section for details. FCB (Pin 7): Forced Continuous Control Input. This input acts on the first controller (or both controllers depending upon the FLTCPL pin—see pin description), and is normally used to regulate a secondary winding. Pulling this pin below 0.8V will force continuous synchronous operation for the first and optionally the second control- ler. Do not leave this pin floating. ITH1, ITH2 (Pins 8, 11): Error Amplifier Output and Switch- ing Regulator Compensation Point. Each associated chan- nels’ current comparator trip point increases with this control voltage. SGND (Pin 9): Small Signal Ground common to both controllers, must be routed separately from high current grounds to the common (–) terminals of the COUT capacitors. 3.3VOUT (Pin 10): Output of a linear regulator capable of supplying 10mA DC with peak currents as high as 50mA. PGND (Pin 20): Driver Power Ground. Connects to the sources of bottom (synchronous) N-channel MOSFETs, an- odes of the Schottky rectifiers and the (–) terminal(s) of CIN. INTVCC (Pin 21): Output of the Internal 5V Linear Low Dropout Regulator and the EXTVCC Switch. The driver and control circuits are powered from this voltage source. Must be decoupled to power ground with a minimum of 4.7 µF tantalum or other low ESR capacitor. The INTVCC regulator standby function is determined by the STBYMD pin. EXTVCC (Pin 22): External Power Input to an Internal Switch Connected to INTVCC. This switch closes and supplies VCC power, bypassing the internal low dropout regulator, whenever EXTVCC is higher than 4.7V. See EXTVCC connection in Applications section. Do not exceed 7V on this pin. BG1, BG2 (Pins 23, 19): High Current Gate Drives for Bottom (Synchronous) N-Channel MOSFETs. Voltage swing at these pins is from ground to INTVCC. VIN (Pin 24): Main Supply Pin. A bypass capacitor should be tied between this pin and the signal ground pin. BOOST1, BOOST2 (Pins 25, 18): Bootstrapped Supplies to the Top Side Floating Drivers. Capacitors are connected between the boost and switch pins and Schottky diodes are tied between the boost and INTVCCpins. Voltage swing at the boost pins is from INTVCC to (VIN + INTVCC). SW1, SW2 (Pins 26, 17): Switch Node Connections to Inductors. Voltage swing at these pins is from a Schottky diode (external) voltage drop below ground to VIN. TG1, TG2 (Pins 27, 16): High Current Gate Drives for Top N-Channel MOSFETs. These are the outputs of floating drivers with a voltage swing equal to INTVCC – 0.5V superimposed on the switch node voltage SW. PI FU CTIO S |
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