LN2406

PWM/PFM automatic switching Controlled Synchronous DC-DC Converters LN2406/7 Series PWM/PFM AUTOMATIC SWITCHING CONTROLLED SYNCHRONOUS DC-DC CONVERTERS LN2406/7 SERIES ■ GENERAL DESCRIPTION LN2406/7 series is a group of high efficiency synchronous-rectification type buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages of 1.8V and 3.3V. Automatic PWM/PFM mode operation increases efficiency and decreases output voltage ripple at light loads, further extending battery life. Switching frequency is internally set at 1.4MHz, allowing the use of small surface mount inductors and capacitors. 100% duty cycle provides low dropout operation. ■ FEATURES ■ APPLICATIONS  High Efficiency: 92％  Input Voltage Range: 2.0 ~ 6.0V  Output Current: 800mA  Shutdown Current: <1uA  Oscillation Frequency: 1.4MHz ■ PACKAGE  Cellular and Smart Phones  PDAs  MP3/MP4 Player  Digital Still and Video Cameras  Microprocessors and DSP Core Supplies  Portable Instruments  SOT-23-5 ■ BLOCK DIAGRAM FB 0.6V EA REF CE Current Sense & Limit PWM/PFM ∑ SLOPE Compensation OSC Logic & Buffer Izero Temperature Protect LX Fig1 Note: Though LN2406, LN2407 are different in pin package, the two parameters are entirely same. Shanghai Natlinear Electronics Co. Ltd -1- http://www.natlinear.com PWM/PFM automatic switching Controlled Synchronous DC-DC Converters LN2406/7 Series ■ ABSOLUTE MAXIMUM RATIN...