LTC3709 Datasheet | Linear Technology

Fast 2-Phase, No RSENSETM, Synchronous DC/DC Controller with Tracking/Sequencing Features DESCRIPTIO - Poly Phase® Valley Current Mode Controller - Synchronizable to an External Clock with PLL - Coincident or Ratiometric Tracking - Sense Resistor Optional - 2% to 90% Duty Cycle at 200k Hz - t ON(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 - Available in 32-Lead (5mm × 5mm) QFN and 36-Lead SSOP Packages U APPLICATIO S - Notebook puters - Power Supply for DSP, ASIC, Graphic Processors 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 pensated for variations in input supply voltage. An internal phase-lock 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 acplished using an external timing capacitor. Fault protection is provided by an output overvoltage 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 as low as 0.6V. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. No RSENSE is a trademark of Linear Technology Corporation. Poly Phase is a registered trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 5481178, 6476589, 6144194, 5847554,...