RICOH RP401x SERIES STEP-UP DC DC CONVERTERS DATASHEET USER GUIDE
Summary
The RP401x Series offers high-efficiency, small-package step-up DC/DC converters for portable and battery-powered electronics such as MP3 players, PDAs, and digital cameras. Designed to operate reliably from extremely low voltages (as low as 0.6V), these ICs provide stable, adjustable power output between 1.8V and 5.5V. This manual details the core technical specifications, including various operational modes—from fixed PWM output to automatic PWM/VFM shifting—and provides comprehensive guides to assist embedded system designers in selecting the optimal component for their compact energy-efficient needs.
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RP401x SERIES
HIGH EFFICIENCY, SMALL PACKAGES, STEP-UP DC/DC CONVERTERS
NO.EA-260-111009
OUTLINE 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 (Ni MH) 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.
FEATURES ● Low Start-up Voltage guaranteed ···························· Typ. 0.6V ● Input Voltage Range ················································ 0.6V ~ 5.5V ● High Efficiency ························································· 86% (100m A / 3.3V, VIN = 1.5V, 25°C) ● Output current·························································· 500m A / 1.8V (VIN = 1.5V) / 5.0V (VIN = 3.3V) ● Built-in Lx switch ······················································ NMOS: 0.4Ω (VOUT = 3.3V, 25°C) ● 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) ● Small Packages ······················································· DFN(PLP)1820-6, SOT23-5
APPLICATIONS ● MP3 players, PDA, cellular phones ● Digital Still Cameras ● LCD Bias Supplies ● Portable blood pressure meter ● Wireless Handset ● GPS
Page Summary Contents For RICOH RP401x SERIES STEP-UP DC DC CONVERTERS DATASHEET USER GUIDE
Manual Details
| Brand | Ricoh |
|---|---|
| Pages | 24 |
| File Size | 575.77 KB |
| Published | May 29, 2026 |
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Frequently Asked Questions
Can this converter operate with low-voltage batteries?
Yes, it guarantees a low start-up voltage (Typ. 0.6V), making it suitable for single or two-series alkaline/NiMH/Li+ batteries.
How do I select the optimal mode for efficiency?
The MODE pin can be set to "L" (PWM/VFM automatic shift) for improved light load efficiency, or choose version 'C' which is a PWM/VFM alternative type.
Does this product have adjustable output voltage?
Yes. The output voltage ranges from 1.8V to 5.5V and can be adjusted on certain versions; others are fixed internally.
What protective features are included with the converter?
It includes a built-in Lx switch, and depending on the model version (A or B), it offers latch type over-current protection circuitry.