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LT3501 - Monolithic Dual Tracking 3A Step-Down Switching Regulator

Both converters are synchronized to either a common external clock input or a resistor programmable fi xed 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 effi ciency and external component size.

Minimum input-to-output voltage ratios are improved by allowing the switch to stay on through multiple clock cycles, only switching off when the boost capacitor needs recharging, resulting in ~95% maximum duty cycle.

Each output can be independently disabled using its own soft-start pin, or by using the SHDN pin the entire part can be placed in a low quiescent current shutdown mode.

The LT3501 is available in a 20-lead TSSOP package with exposed leadframe for low thermal resistance.

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 Typical Application

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

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