LTC3531-3

LTC3531/ LTC3531-3.3/LTC3531-3 200mA Buck-Boost Synchronous DC/DC Converters + U U FEATURES ■ Regulated Output with Input Above, Below or Equal to the Output ■ Single Inductor ■ Up to 90% Efficiency ■ VIN Range: 1.8V to 5.5V ■ 200mA at 3.3VOUT from 3.6V Input ■ 125mA at 3VOUT from 2.5V Input ■ Fixed VOUT Versions (TSOT, DFN): 3.3V, 3V ■ Adjustable VOUT Version (DFN): 2V to 5V ■ Burst Mode® Operation, No External Compensation ■ Ultra Low Quiescent Current: 16μA, Shutdown Current <1μA ■ Only 3 External Components Required (Fixed Voltage Versions) ■ Short-Circuit Protection ■ Output Disconnect in Shutdown ■ Available in 6-Pin ThinSOT and 3mm × 3mm DFN Packages U APPLICATIO S ■ Handheld Instruments ■ MP3 Players ■ Handheld computers ■ PDA/GPS DESCRIPTIO The LTC®3531/LTC3531-3.3/LTC3531-3 are synchronous buck-boost DC/DC converters that operate from input voltages above, below or equal to the output voltage. The topology incorporated in the ICs provides a continuous transfer through all operating modes, making the product ideal for single cell Li-Ion and multicell alkaline or nickel applications. The converters operate in Burst Mode, minimizing solution footprint and component count as well as providing high conversion efficiency over a wide range of load currents. The devices include two 0.5Ω N-channel MOSFET switches and two P-channel switches (0.5Ω, 0.8Ω). Quiescent current is typically 16μA, making the parts ideal for battery power applications. Other features include a <1μA ...