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Linear Technology Corporation (Linear Technology) has launched 1.25MHz, current mode, synchronous boost DC / DC Converter LTC3427. Internal switch the device from 1.8V to 5V input voltage range to provide 500mA current limit (minimum) and IC RB495D and up to 5.25V output voltage, making the device ideal for Li-ion battery and dual cell alkaline / NiMH applications. LTC3427 from two alkaline batteries provide up to 200mA of continuous output current (at 3.3V). Allegedly, the synchronous rectification to achieve up to 94% efficiency. In addition, 1.25MHz constant switching frequency minimizes switching noise, and allows the use of tiny low cost inductors and capacitors. The 2mm × 2mm DFN package and tiny externals for the battery powered handheld applications in a very compact and small footprint of flat solutions. LTC3427 uses RDS (ON) of only 0.52Ω (N channel) and 0.57Ω (P-Channel) internal switch. The devices true output disconnect feature allows the output disconnect in shutdown completely. It also limits the inrush current at startup, minimizing the input power supply inrush current. Other features include anti-ringing control, short circuit protection, programmable soft-start and thermal protection. LTC3427 is ideal for up to 200mA output current need to boost applications and solutions requiring small size and long battery life applications. LTC3427EDC Summary of Features: ? High efficiency: 94% * from two alkaline batteries provide 3.3V/200mA · from a single Li-Ion battery 5V/200mA · inrush current limiting and soft start output disconnect during shutdown 1.8 range of V to 5V VIN range of 1.8V to 5.25V VOUT 1.25MHz fixed frequency, low-noise PWM · internal synchronous rectifier shutdown logic control (less than 1uA) · anti-ringing control to minimize EMI · tiny external components short circuit protection Flat (0.75mm × 2mm × 2mm) DFN Package

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