LN2408

LN2408 PWM/PFM Automatic Switching Controlled Synchronous DC-DC Converters ■ General Description LN2408 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  High Efficiency: 95％  Minimum quiescent current: 180μA( typ)  Maximum Output Current: 600mA  Small PSRR: <±0.4%  low-voltage operation: up to 100% duty cycle  PWM / PFM automatic switching ■ Applications  Digital cameras, electronic notebook, PDA and other mobile devices, power supply  CD player, MD and other audio...