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LTC3709 Datasheet(PDF) 1 Page - Linear Technology |
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LTC3709 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LTC3709 3709f Fast 2-Phase, No RSENSE TM, Synchronous DC/DC Controller with Tracking/Sequencing ■ PolyPhase TM Valley Current Mode Controller ■ Synchronizable to an External Clock with PLL ■ Coincident or Ratiometric Tracking ■ Sense Resistor Optional ■ 2% to 90% Duty Cycle at 200kHz ■ tON(MIN) < 100ns ■ True Remote Sensing Differential Amplifier ■ High Efficiency at Both Light and Heavy Loads ■ Power Good Output Voltage Monitor ■ 0.6V ±1% Reference ■ Adjustable Current Limit ■ Programmable Soft-Start and Operating Frequency ■ Output Overvoltage Protection ■ Optional Short-Circuit Shutdown Timer ■ 32-Lead (5mm × 5mm) QFN Package ■ Notebook Computers ■ Power Supply for DSP, ASIC, Graphic Processors Protected by U.S. Patents, including 5481178, 6476589, 6144194, 5847554, 6177678, 6304066, 6580258, 6674274, 6462525, 6593724. High Efficiency Dual Phase 1.5V/30A Step-Down Converter The LTC ®3709 is a single output, dual phase, synchronous step-down switching regulator. The controller uses a constant on-time, valley current control architecture to deliver very low duty cycles without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in input supply voltage. An internal phase-locked loop allows the LTC3709 to be synchronized to an external clock. A TRACK pin is provided for tracking or sequencing the output voltage among several LTC3709 chips or an LTC3709 and other DC/DC regulators. Soft-start is ac- complished using an external timing capacitor. Fault protection is provided by an output overvoltage com- parator and an optional short-circuit shutdown timer. The current limit level is user programmable. A wide supply range allows voltages as high as 31V to step down to 0.6V. FEATURES DESCRIPTIO APPLICATIO S VIN 4.5V TO 28V + TRACK TG1 BOOST1 SW1 BG1 BG2 PGND1 BOOST2 TG2 SW2 SENSE1– SENSE2– PGND2 3709 TA01a SENSE1+ SENSE2+ 5V 324k 10Ω 4.7µF 1µF 47.5k HAT2168H HAT2165H HAT2165H PGND1 PGND2 0.22µF 0.22µF HAT2168H 1.22µH 1.22µH 10µF 35V ×3 330µF 2.5V ×4 VOUT 1.5V 30A VIN VCC DRVCC ION VRNG FCB PGOOD LTC3709 RUN/SS EXTLPF INTLPF 10k 100nF ITH SGND VFB DIFFOUT VOS – VOS + 1µF 1µF 15k 10k 100k 0.1µF 3.32k 680pF 20k TYPICAL APPLICATIO LOAD CURRENT (A) 65 95 100 60 55 90 75 85 80 70 0.01 1 10 100 3709 TA01b 50 3 9 10 2 1 8 5 7 6 4 0 0.1 VIN = 12V EFFICIENCY POWER LOSS Efficiency and Power Loss , LTC and LT are registered trademarks of Linear Technology Corporation. No RSENSE and PolyPhase are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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