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. |
|
|
 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 |
|
| Packages |
DFN(PLP)1820-6, SOT23-5 (SOT23-5 is under development) |
|
| Internal EMI suppression (Anti-ringing switch is included) |
|
 |
MP3 players, PDA
|
|
Digital Still Cameras
|
|
LCD Bias Supplies
|
|
Personal Medical Equipments
|
|
Wireless Handset
|
|
GPS
|
| * All PDF files are less than 1MB unless otherwise stated. |
| * If you don't have Adobe Reader, you can download free. |
|
 |
|
|
|
|
|
Technical Info.
Technical Information on Ricoh Power Management ICs.
|
|
|
 |
|
|
|
|
|
Product Catalog
|
|
| Selection guide is available for download in PDF format. |
|
|
|
|
| |
|
|
Non-promotion / Discontinued Products
|
|
|
|
|
RP400x
Series
