DESCRIPTION
The LTC®3565 is a constant frequency, synchronous step-down DC/DC converter. Intended for medium power applications, it operates from a 2.5V to 5.5V input voltage range and has a user confi gurable operating frequency up to 4MHz, allowing the use of tiny, low cost capacitors and inductors 1mm or less in height. The output voltage is adjustable from 0.6V to 5.5V. Internal synchronous power switches provide high effi ciency. The LTC3565’s current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors.

FEATURES
■ High Effi ciency: Up to 95%
■ VIN Range: 2.5V to 5.5V
■ High Frequency Operation: Up to 4MHz
■ Selectable Low Ripple (Typical 25mVp-p)
   Burst Mode® Operation: IQ = 40μA
■ Stable with Ceramic Capacitors
■ Uses Tiny Capacitors and Inductor
■ Low RDS(ON) Internal Switches: 0.15Ω
■ Current Mode Operation for Excellent Line
   and Load Transient Response
■ Short-Circuit Protected
■ Low Dropout Operation: 100% Duty Cycle
■ Low Shutdown Current: IQ ≤ 1μA
■ Output Voltages from 0.6V to 5V
■ Synchronizable to External Clock
■ Supports Pre-Biased Outputs
■ Small 10-Lead (3mm × 3mm) DFN or MSOP Package

APPLICATIONS
■ Notebook Computers
■ Digital Cameras
■ Cellular Phones
■ Handheld Instruments
■ Board Mounted Power Supplies