Shanghai Aeneas Electronics.CO.,LTD. 上海东钜电子有限公司

RICOH/power

RP400 Series

High Efficiency, Small Packages Step-Up DC-DC Converters

RP400xseries 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. 0.8V) operation from one to two alkaline or nickel-metal-hydride (NiMH) battery, or a single Li+ battery.

This IC consists of a reference voltage unit with soft start, error amplifier, PWM comparator, current limit circuit and internal switch and PWM/VFM mode control circuit. A low ripple high efficiency step up DC/DC converter can be composed of RP400xseries with only an inductor, a diode, divider resistors and a capacitor. This converter is based on a fixed frequency current mode PWM control which goes to power save mode(VFM mode) at light load automatically. RP400xseries has built-in Anti-ringing Switch to prevent switching node from ringing, when the converter enters the discontinuous current mode.

Output voltage can be set within 1.8~5.0V (recommended range of output voltage) by external divider resistors.

Feature

● Low Start-up Voltage guaranteed

0.9V

● Input Voltage Range:

0.9V to 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=0.9V)

● Internal Switch

NMOS=0.4Ω NMOS=0.4Ω (VOUT=3.3V, 25°C)

● Built-in Frequency Compensation, Soft Start, Protection Circuit

● PWM Low Ripple Oscillator Frequency

700kHz

● Output Voltage range

Fixed: 1.8V to 5.0V with 0.1V Stepwise(under ｄevelopment )
Adjustable: 1.8V~5.0V (RP400K001 only)
(recommended range of output voltage)

● Stable with Ceramic Capacitors

● Small Package

DFN(PLP)1820-6, SOT23-5 (SOT23-5 is under development)

● Internal EMI suppression (Anti-ringing switch is included)

Applications

● MP3 players, PDA

● Digital Still Cameras

● LCD Bias Supplies

● Personal Medical Equipments

● Wireless Handset

● GPS

Data Sheet(PDF)

RP400 Series