LTC3459 10V Micropower Synchronous Boost Converter FEATURESDESCRIPTION n Small Solution Size The LTC®3459 is a low current, high effi ciency synchronous n >85% Effi ciency over Wide Load Range boost converter intended for low power, size constrained n Internal Synchronous Rectifi er portable applications. The LTC3459 can be powered from n VIN Range: 1.5V to 5.5V a single lithium ion battery, a 2- to 3-cell stack of alkaline n 5V at 30mA from 3.3V Input or nickel batteries, or any low impedance voltage source n 3.3V at 20mA from 2 AA Cell Input between 1.5V and 5.5V. The output is programmable via n Programmable Output Voltages Up to 10V an external divider between 2.5V and 10V. Although the n Burst Mode® Operation part is primarily intended for boost applications, VOUT will n Inrush Current Limiting maintain regulation below VIN (at reduced effi ciency). n Output Disconnect in Shutdown The LTC3459 offers Burst Mode operation with a fi xed n Ultralow Quiescent (10μA) and Shutdown (<1μA) peak current, providing high conversion effi ciency over Currents a wide range of load currents. During start-up, inductor n Low Profi le 2mm × 2mm DFN, 2mm × 3mm DFN or current is controlled preventing the inrush surge current SOT-23 Package found in many boost converters. In shutdown the output is disconnected from the input and quiescent current is APPLICATIONS reduced to <1μA. n The LTC3459 is offered in low profi le 6-pin 2mm General Purpose Micropower Boost × 2mm n DFN, 2mm Digital Cameras × 3mm DFN or SOT-23 (ThinSOTTM) packages, n allowing a tiny footprint for the total solution. PDAs n LCD Bias , LT, LTC, LTM and Burst Mode are registered trademarks of Linear Technology n Small OLED Displays Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Supercap Charging TYPICAL APPLICATION5V to 8V ConverterEffi ciency 100 VIN = 5V 22μH VOUT = 8V 90 SW VOUT 5V VIN V 8V OUT 80 30mA 2M 47pF LTC3459 1μF OFF ON SHDN FB 4.7μF 70 EFFICIENCY (%) GND 365k 60 3459 TA01a 50 0.01 0.1 1 10 100 ILOAD (mA) 3459 TA01b 3459fc 1
