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LTC1708EG-PG Datasheet(PDF) 9 Page - Linear Technology |
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LTC1708EG-PG Datasheet(HTML) 9 Page - Linear Technology |
9 / 32 page 9 LTC1708-PG FU CTIO AL DIAGRA Figure 2 PI FU CTIO S BOOST1, BOOST2 (Pins 33, 26): Bootstrapped Supplies to the Topside 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 34, 25): 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 35, 24): 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. PGOOD (Pin 36): Open-Drain Logic Output. PGOOD is pulled to ground when the voltage at either EAIN pin is not within 7.5% of the setpoint. SWITCH LOGIC – + 0.8V 4.8V 5V VIN VIN 4.5V BINH 0.86V 0.74V 0.74V 0.86V VFB1 CLK2 CLK1 0.17 µA + – + – + – + – + – FCB + – – + – + – + VREF INTERNAL SUPPLY EACH VID INPUT 3.3VOUT VSEC FCB EXTVCC INTVCC SGND STBYMD 5-BIT VID DECODER + 5V LDO REG SW SHDN 0.6V TOP BOOST TG CB CIN D1 DB PGND BOT BG INTVCC INTVCC VIN + CSEC COUT VOUT 1708 F02 DSEC RSENSE EAIN VFB2 DROP OUT DET RUN SOFT- START BOT TOP ON S R Q Q OSCILLATOR FREQSET FCB EA 0.860V 0.800V OV VFB 1.2 µA 6V – + RC 4(VFB) RST SHDN RUN/SS ITH CC CC2 CSS 1.19V 1M 4(VFB) 0.86V SLOPE COMP 3mV + – – + SENSE– SENSE+ INTVCC 30k 45k 2.4V 45k 30k I1 I2 ATTNIN VID0 ATTNOUT PGOOD DUPLICATE FOR SECOND CONTROLLER CHANNEL + – – + R2 10k R1 VARIABLE VID1 VID2 VID3 VID4 40k VIDVCC |
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