LTC3709 Series

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

Catalog

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

Part	Supplier Device Package	Control Features	Output Configuration	Output Phases	Duty Cycle (Max) [Max]	Function	Topology	Voltage - Supply (Vcc/Vdd) [Min]	Voltage - Supply (Vcc/Vdd) [Max]	Operating Temperature [Max]	Operating Temperature [Min]	Synchronous Rectifier	Mounting Type	Number of Outputs	Output Type	Clock Sync	Package / Case [x]	Package / Case
Analog Devices LTC3709EUH#PBF	32-QFN (5x5)	Enable Power Good Soft Start Tracking	Positive	2	90 %	Step-Down	Buck	3.9 V	37 V	85 °C	-40 °C		Surface Mount	1	Transistor Driver
Analog Devices LTC3709EG#TRPBF	36-SSOP	Enable Power Good Soft Start Tracking	Positive	2	90 %	Step-Down	Buck	3.9 V	37 V	85 °C	-40 °C		Surface Mount	1	Transistor Driver		0.209 " 5.3 mm	36-SSOP

Catalog

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

Key Features

• PolyPhase®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

Description

The LTC3709 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.ApplicationsNotebook ComputersPower Supply for DSP, ASIC, Graphic Processors