DESCRIPTION
The LTC®3417 is a dual constant frequency, synchronous step-down DC/DC converter. Intended for medium power applications, it operates from a 2.25V to 5.5V input voltage range and has a constant programmable switching frequency, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. Each output voltage is adjustable from 0.8V to 5V. Internal synchronous low RDS(ON) power switches provide high efficiency without the need for external Schottky diodes.

FEATURES
■ High Effi ciency: Up to 95%
■ 1.4A/800mA Guaranteed Minimum Output Current
■ No Schottky Diodes Required
■ Programmable Frequency Operation: 1.5MHz or
   Adjustable From 0.6MHz to 4MHz
■ Low RDS(ON) Internal Switches
■ Short-Circuit Protected
■ VIN: 2.25V to 5.5V
■ Current Mode Operation for Excellent Line and
   Load Transient Response
■ 125μA Quiescent Current in Sleep Mode
■ Ultralow Shutdown Current: IQ < 1μA
■ Low Dropout Operation: 100% Duty Cycle
■ Power Good Output
■ Phase Pin Selects 2nd Channel Phase Relationship
   with Respect to 1st Channel
■ Internal Soft-Start with Individual Run Pin Control
■ Available in Small Thermally Enhanced
   (5mm × 3mm) DFN and 20-Lead TSSOP Packages

APPLICATIONS
■ PDAs/Palmtop PCs
■ Digital Cameras
■ Cellular Phones
■ PC Cards
■ Wireless and DSL Modems