ME2129FM5G

ME2129 ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR General Description Features The ME2129 series is a CMOS step-up switching regulator which mainly consists of a reference voltage source, an oscillation circuit, an error amplifier, a phase compensation circuit, a PWM/PFM switching control circuit. Without the use of external low-ON-resistance Nch Power MOS, can be applied to need a high efficiency, high output current of the application circuit. The ME2129 series switches its operation to the PFM control circuit whose duty ratio is 15 % with to the PWM/PFM switching control circuit under a light load and to prevent decline in the efficiency by IC operation current.      Low voltage operation: Start-up is guaranteed from 0.9 V(IOUT =1 mA ) Duty ratio: Built-in PWM/PFM switching control circuit 15 to 78 % . oscillator frequency：300KHz External parts: coil, diode, capacitor, and transistor Output voltage range：