The LTC3709EG 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 LTC3709EG to be synchronized to an external clock.
A TRACK pin is provided for tracking or sequencing the output voltage among several LTC3709EG chips or an LTC3709EG 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.
Feature
- 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
Applications
- Notebook Computers
- Power Supply for DSP, ASIC, Graphic Processors
(Picture: Pinout)
