RP400xxx1C SERIES HIGH EFFICIENCY, SMALL PACKAGES, STEP-UP DC/DC CONVERTERS NO.EA-193-150909 OUTLINE RP400xxx1C Series are high efficiency, step-up DC/DC converter ICs packaged in compact 5pin SOT23 or 6pin DFN(PLP). This converter starts up of low voltage (Typ.1.2V) operation from one to two alkaline or a nickel-metal-hydride (NiMH) or one-cell Lithium-ion (Li+) battery. This IC consists of a reference voltage unit with soft start, a chip enable circuit, an error amplifier, phase compensation circuits, a slope circuit, a PWM control circuit, a start-up circuit, a PWM/VFM mode control circuit, internal switches and a protection circuit. As a protection circuit, RP400xxx1C has a current limit circuit which limits the peak current of the inductor at each clock cycle. A low ripple high efficiency step up DC/DC converter can be composed of RP400xxx1C Series with only an inductor, a diode and capacitors. This converter is based on a fixed frequency current mode PWM control which goes to power save mode (VFM mode) at light load automatically. RP400xxx1C Series has built-in Anti-ringing switch to prevent switching node from ringing, when the converter enters the discontinuous current mode. The output voltage of RP400K001C can be set within 1.8~5.0V (recommended range of output voltage) by external divider resistors. FEATURES Low Start-up Voltage guaranteed 1.2V Input Voltage Range 1.2V~5.5V High Efficiency 85% (100mA/3.3VVIN=1.5V25C) Output current 200mA/3.3V(VIN=1.5V) Typ. 100mA/2.0V(VIN=1.2V) Internal Switch NMOS=0.4 (VOUT=3.3V, 25C) Built-in Phase Compensation, Soft Start, Peak Current Limit Protection PWM Oscillator Frequency 700kHz Output Voltage Range Fixed: 1.8V to 5.0V with 0.1V Stepwise Adjustable: 1.8V~5.0V (RP400K001C only) (Recommended range of output voltage) Stable with Ceramic Capacitors Small Package DFN(PLP)1820-6, SOT23-5 Internal EMI suppression (Anti-ringing switch is included) APPLICATIONS MP3 players, PDA Digital Still Cameras LCD Bias Supplies Portable blood pressure meter Wireless Handset GPS 1 RP400xxx1C BLOCK DIAGRAMS 1. Adjustable Output with CE function RP400K001C Lx Startup Control Buffer V IN Circuit Logic VOUT Current PW M Sense Control ErrorAm p fosc - Chip V FB CE PFM Enable + Power Save M ode Sleep Vref O peration Control GND 2. Fixed Output with CE function RP400xxx1C Lx Startup Control Buffer V Circuit IN Logic Current PW M Sense Control ErrorAm p Chip fosc - V OUT Enable CE PFM + Power Save M ode Sleep Vref O peration Control GND 2