LTC3411A

LTC3411A 1.25A, 4MHz, Synchronous Step-Down DC/DC Converter FEATURES nn Uses Tiny Capacitors and Inductor nn High Frequency Operation: Up to 4MHz nn Low RDS(ON) Internal Switches: 0.15Ω nn High Efficiency: Up to 96% nn Selectable Low Ripple (25mVP-P) Burst Mode® Operation: IQ = 40µA nn Stable with Ceramic Capacitors nn Current Mode Operation for Excellent Line and Load Transient Response nn Short-Circuit Protected nn Low Dropout Operation: 100% Duty Cycle nn Low Shutdown Current: IQ ≤ 1µA nn Output Voltages from 0.8V to 5V nn Synchronizable to External Clock nn Supports Prebiased Outputs nn Small 10-Lead 3mm × 3mm DFN or MSOP Package APPLICATIONS nn Notebook Computers nn Digital Cameras nn Cellular Phones nn Handheld Instruments nn Board Mounted Power Supplies DESCRIPTION The LTC®3411A 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 configurable 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 0.8V to 5.5V. Internal synchronous power switches provide high efficiency. The LTC3411A’s current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors. The LTC3411A can be configured for automatic power saving Burst Mode operation (IQ = 40µA) to reduce gate charge losses when th...