RICOH RP501K SERIES Data Manual (1) User Guide
Summary
The RP501K series provides a sophisticated solution for step-down DC/DC conversion using integrated CMOS technology and synchronous rectifiers. This efficient converter generates low ripple, stable power (1.0V–3.3V) with built-in protection features like UVLO and current limiting. The associated manual details the IC's architecture, operational modes, package specifications, and application guidelines. It is ideal for designers creating portable electronics, including cellular devices, PCs, battery-powered equipment, and vehicle accessories.
Page 1 Text Content
RP501K SERIES
1A Step-down DC/DC Converters with synchronous rectifier
NO.EA-199-111124
OUTLINE The RP501K Series are CMOS-based step-down DC/DC Converters with synchronous rectifier. Each of these ICs consists of an oscillator, a switching control circuit, a reference voltage unit, an error amplifier, a soft-start circuit, protection circuits, UVLO circuit, switching transistors. A low ripple, high efficiency step-down DC/DC converter can be easily composed of this IC with only an inductor and capacitors. In terms of the output voltage, since the feedback resistances are built-in, the voltage is fixed internally. 50m V (custom-made) step output can be set by laser-trim and ±1.5% or ±24m V tolerance depending on the output voltage is guaranteed. Mode alternative circuit works automatically for improving the efficiency. Considering fixed noise frequency, PWM fixed control type is also available. As protection circuits, the current limit circuit which limits peak current of LX at each clock cycle, and the latch type protection circuit which works if the term of the over-current condition keeps on a certain time exist. The latch-type protection circuit works to latch an internal driver with keeping it disable. To release the condition of the protection, after disabling this IC with a chip enable circuit, enable it again, or restart this IC with power-on or make the supply voltage at UVLO detector threshold level or lower than UVLO. Since the package is DFN(PLP)2527-10, high density mounting on boards is possible.
FEATURES Input Voltage Range ..............................................2.5V to 5.5V Output Voltage .......................................................1.0V to 3.3V High Accuracy Output Voltage ...............................±1.5% (VOUT≥1.6V) ±24m V (VOUT<1.6V) Oscillator Frequency..............................................Typ. 2.25MHz Built-in Soft start Function......................................Max.0.2ms Built-in Peak current limit .......................................Typ.1.5A Built-in UVLO Function ..........................................Typ. 2.2V Switching Mode can be controlled by Mode pin ....Automatic PWM/VFM mode change / PWM fixed Package .................................................................DFN(PLP)2527-10
APPLICATIONS Power source for portable equipment such as cellular, PDA, DSC, Notebook PC Power source for HDD, WLA N, Car accessories Power source for Li-ion battery-used equipment
Page Summary Contents For RICOH RP501K SERIES Data Manual (1) User Guide
Manual Details
| Brand | Ricoh |
|---|---|
| Pages | 32 |
| File Size | 1.17 MB |
| Published | May 29, 2026 |
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Frequently Asked Questions
What is the input voltage range for this converter?
The acceptable PVIN and AVIN supply voltage range is -0.3V to 6.5V.
How can I automate or fix the switching control mode?
You can select the mode using the MODE pin: Mode="H" defaults to PWM/VFM alternative, while setting it to "L" uses fixed PWM control.
What is the mechanism for releasing the over-current latch protection?
To reset the latch type protection circuit, you must either disable and re-enable the IC via the chip enable circuit, or perform a power-on/restart.
Does this converter handle low current draws or high-power devices?
The device is suitable for portable equipment (like cell phones) and has a built-in peak current limit of Typ. 1.5A.