LTC3530

FEATURES n Regulated Output with Input Voltages Above, Below or Equal to the Output n 1.8V to 5.5V Input and 1.8V to 5.25V Output Range n 250mA Continuous Output Current from 1.8V VIN n 600mA Continuous/1A Peak Output Current from Li-Ion n Single Inductor n Synchronous Rectification: Up to 96% Efficiency n Programmable Automatic Burst Mode® Operation n Output Disconnect in Shutdown n Pin Compatible with the LTC3440 n Programmable Frequency from 300kHz to 2MHz n <1μA Shutdown Current n Small Thermally Enhanced 10-Lead (3mm × 3mm) DFN and 10-Lead MS Packages APPLICATIONS n MP3 Players n Handheld Instruments n Digital Cameras n Smart Phones n Portable GPS Units n Miniature Hard Disk Drive Power LTC3530 Wide Input Voltage Synchronous Buck-Boost DC/DC Converter DESCRIPTION The LTC®3530 is a wide VIN range, highly efficient, fixed frequency, buck-boost DC/DC converter that operates from input voltages above, below or equal to the output voltage. The topology incorporated in the IC provides a continuous transfer function through all operating modes, making the product ideal for single lithium-ion, two-cell alkaline or NiMH applications where the output voltage is within the battery voltage range. The LTC3530 is pin compatible with the LTC3440 buckboost DC/DC converter but adds programmable automatic Burst Mode operation and extends the VIN/VOUT range to 1.8V. Switching frequencies up to 2MHz are programmed with an external resistor. Automatic Burst Mode operation allows the user to pro...