HIGH EFFICIENCY, SMALL PACKAGES, STEP-UP DC/DC CONVERTERS
RP401x Series are high efficiency, step-up DC/DC converter ICs packaged in compact 5pin SOT23-5， or 6pin DFN(PLP)1820-6. This IC can start up from low voltage (Typ.0.6V), therefore, it is suitable for using with single or 2 serial alkaline batteries, or a nickel-metal-hydride (NiMH) battery, or one-cell Lithium-ion (Li+) battery.
This IC consists of an oscillator, 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.
A low ripple high efficiency step-up DC/DC converter can be composed of the RP401x with only an inductor, a diode, (resisters for adjustable type), and capacitors. The output voltage of the RP401K001s is adjustable, and others are fixed internally. The output voltage range is from 1.8V to 5.5V. RP401Kxx1A/B series have a MODE pin to alternate between PWM fix and PWM/VFM automatic shift to improve the efficiency at light load. If MODE pin is set "H", the mode is PWM fix, and when the MODE pin is set "L", PWM/VFM automatic shift. The RP401xxx1C and D do not have MODE pin. The RP401xxx1C is PWM/PFM alternative type, and the RP401xxx1D is PWM fixed type.
|Low Start-up Voltage guaranteed||TYP.0.6V|
|Input Voltage Range||0.6V ~ 5.5V|
|High Efficiency||86% (100mA/3.3V，VIN=1.5V)|
|Output current||TYP. 500mA/1.8V,VIN=1.5V
|Built-in Lx switch||TYP. 0.4Ω (VOUT=3.3V)|
|PWM Oscillator Frequency||1.2MHz|
|Output Voltage Range||Fixed type: 1.8V to 5.5V with 0.1V Stepwise
Adjustable: 1.8V ~ 5.5V
(Recommendation range of output voltage)
|Lx peak current limit function||TYP. 1.0A|
|Latch protection delay time||3.3ms (Only applied to A version)|
- ・MP3 players, PDA, cellular phones
- ・Digital Still Cameras
- ・LCD Bias Supplies
- ・Portable blood pressure meter
- ・Wireless Handset
|Data Sheet||Flyer||Design Guide|
|Package Info.||Mark Info.||Quality Assurance Data|
All PDF files are less than 1MB unless otherwise stated.