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LTC3709 - Fast 2-Phase, No RSENSE™ Synchronous DC/DC Controller with Tracking/Sequencing

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 accomplished using an external timing capacitor.

Fault protection is provided by an output overvoltage comparator 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.

Protected by U.S. Patents, including 5481178, 6476589, 6144194, 5847554, 6177678, 6304066, 6580258, 6674274, 6462525, 6593724.

特点 PolyPhaseTM 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 典型应用

应用 Notebook Computers Power Supply for DSP, ASIC, Graphic Processors 封装信息

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