LTC3426 Datasheet | Linear Technology

Features n Internal 2A MOSFET Switch n 1.2MHz Switching Frequency n Integrated Soft-Start n Low 1.6V VIN Operation n Low RDS(ON) Switch: 100mΩ at 5V Output n Delivers 5V at 800m A from a 3.3V Input n Delivers 3.3V at 800m A from a 2.5V Input n Uses Small, Low Profile External ponents n Low Profile (1mm) SOT-23 (Thin SOT™) Package APPLICATIONS n White LED Driver Supply n Local 3.3V or 5V Supply n Battery Back-Up TYPICAL APPLICATION 3.3V to 5V Boost Converter VIN 2.2µH 3.3V 10µF SW VIN VOUT OFF ON SHDN VOUT 5V 800m A 22µF 3426 TA01 LTC3426 1.2MHz Step-Up DC/DC Converter in SOT-23 DESCRIPTION The LTC®3426 step-up switching regulator generates an output voltage of up to 5.5V from an input voltage as low as 1.6V. Ideal for applications where space is limited, it switches at 1.2MHz, allowing the use of tiny, low cost and low profile external ponents. Its internal 2A, 100mΩ NMOS switch provides high efficiency even at heavy load, while the constant frequency, current mode architecture results in low, predictable output noise that is easy to filter. Antiringing circuitry reduces EMI concerns by damping the inductor while in discontinuous mode, and internal soft-start eases inrush current worries. Internal frequency pensation is designed to acmodate ceramic output capacitors, further reducing noise. The device Features very low shutdown current of 0.5µA. The LTC3426 is available in the 6-lead SOT-23 package. L, LT, LTC and LTM are registered trademarks and Thin SOT is a trademark of Analog Devices, Inc. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6498466, 6611131. EFFICIENCY (%) Efficiency VIN = 3.3V VOUT = 5V 80 75 50 1 10 100 LOAD CURRENT (m A) 3426 TA01b For more information .linear./LTC3426 3426fb...