ME2129F

ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Ver 03 ULTRA-SMALL PACKAGE PWM/PFM SWITCHING CONTROL STEP-UP SWITCHING REGULATOR Featureÿ l l l l l l l l 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 frequencyÿ300KHz External parts: coil, diode, capacitor, and transistor Output voltage range: 1.5V ~6.5 V Output voltage accuracyÿ±2% Soft start function: 2 ms. PACKAGEÿSOT-23-5 Descriptionÿ 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. With an external low-ON-resistance Nch Power MOS, this product is applicable to applications requiring high efficiency and high output current. 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. Selection Guideÿ VÛ `R mw yÑ b€ Typical Application: l l l l l l l l l Mobile phones (PDC, GSM, CDMA, IMT200 etc.) Bluetooth equipment PDA Portable communication modem Portable games Cameras Digital cameras Cordless phones Notebook computers ww w.g ec ofot h.co m 1/13 N~§NãtÿmñW3^VÛmw`RyÑb€g–PQlSø Tel: 0755-8398 3377 / 135 9011 2223 http://www.gofotech.com ULTRA-SMALL PACK...