DescripTion
The LT®3501 is a dual-current mode PWM step-down DC/DC converter with two internal 3.5A switches. Independent input voltage, feedback, soft-start and power good pins for each channel simplify complex power supply tracking/sequencing requirements.
Both converters are synchronized to either a common external clock input or a resistor programmable fixed 250kHz to 1.5MHz internal oscillator. At all frequencies, a 180° phase relationship between channels is maintained, reducing voltage ripple and component size. Programmable frequency allows for optimization between efficiency and external component size.

FEATUREs
Wide Input Range: 3.1V to 25V
Two Switching Regulators with 3A Output Capability
Independent Supply to Each Regulator
Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 1.5MHz
Antiphase Switching
Outputs Can be Paralleled
Independent, Sequential, Ratiometric or Absolute Tracking Between Outputs
Independent Soft-Start and Power Good Pins
Enhanced Short-Circuit Protection
Low Dropout: 95% Maximum Duty Cycle
Low Shutdown Current: <10µA
20-Lead TSSOP Package with Exposed Leadframe

APPLICATIONs
DSP Power Supplies
Disc Drives
DSL/Cable Modems
Wall Transformer Regulation
Distributed Power Regulation