HIGH EFFICIENCY, SMALL PACKAGES, STEP-UP DC/DC CONVERTERS
RP400xxx1B 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.0.7V) 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, 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, RP400xxx1B 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 RP400xxx1B 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. RP400xxx1B 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 RP400K001B can be set within 1.8~5.0V (recommended range of output voltage) by external divider resistors.
|Low Start-up Voltage guaranteed||0.7V|
|Input Voltage Range||0.7V~5.5V|
|High Efficiency||85% (100mA / 3.3V, VIN = 1.5V, 25°C)|
|Output current||200mA / 3.3V (VIN = 1.5V)
Typ.100mA / 2.0V (VIN = 1.2V)
|Internal Switch||NMOS=0.4Ω (VOUT=3.3V, 25°C)|
|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 (RP400K001B 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)|
- ・MP3 players, PDA
- ・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.