Ricoh manuals, page 4
RICOH R1242S Series handbook
The R1242S Series are 30V input, CMOS-based PWM step-down DC/DC converters featuring 3A∗ output current. R1242S includes a soft start circuit and a latch or fold-back protection circuit. By simply using an inductor, resistors, a low side switch (FET), and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. Due to current mode PWM control, the R1242S provides a fast response and high efficiency. Ceramic output capacitors can be used.
RICOH R1240x Series 1.2A ∗ 30V Input PWM Step-down DC/DC Converter Manual
RICOH Step-Up DC_DC Converter with voltage regulator detector RP600x SERIES handbook
RICOH PWM Step-down DC/DC Converter with switch function R5220x SERIES handbook
R5220x SERIES PWM Step-down DC/DC Converter with switch function
RICOH R5220x Series 400mA ∗ PWM Step-down DC/DC Converter with Switch Function Manual
The R5220x Series 400mA ∗PWM Step-down DC/DC Converter with Switch Function is a CMOS-based PWM step-down DC/DC converter with synchronous rectifier. R5220x also has the function of switching to the LDO regulator. By switching with the MODE pin, the device can be used as an LDO regulator (Output Current 50mA) in the smaller output current range, while it can be used as a DC/DC converter (Output Current 400mA∗) under high load conditions. (The polarity of the MODE pin is selectable.) The DC/DC converter contains an under-voltage lockout circuit (UVLO), a soft start circuit, and a latch type protection circuit. By simply using an inductor and a capacitor, a high-efficiency DC/DC converter can be easily configured.
RICOH RP901K Series PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier Equipped with VR VD handbook
The RP901K Series are CMOS-based PWM/VFM step-down DC/DC converters equipped with voltage regulator and voltage detector. The DC/DC converter can be selected from two control types - fixed PWM control or PWM/VFM auto switching control in which mode automatically switches to high-efficiency VFM mode in low output current. RP901K was developed for applications that require multiple power supplies such as storage devices. It integrates an 800mA output current step-down DC/DC converter, a 600mA output current LDO regulator, and a voltage detector with a built-in delay circuit into a small package. The regulator can be started after soft start of the DC/DC converter by sequence control.
RICOH Step Down DC/DC converter with LDO Reset RP901series handbook
The document is about the technical manual of RP901K. It introduces the features and characteristics of the product, including the working principle, usage method, precautions, etc.
RICOH RP904Z SERIES PWM/PFM step-down DC/DC Converters with synchronous rectifier Through mode handbook
The RP904 series are CMOS-based PWM/PFM step-down DC/DC converters with synchronous rectifier, low supply current and through mode. The DC/DC converter of the RP904X consists of an oscillator, a PWM/PFM control circuit, a reference voltage unit, an error amplifier, a soft-start circuit, protection circuits, a protection against miss operation under low voltage (UVLO), PWM-DC to DC converter or bypass switch alternative circuit, a chip enable circuit, and a driver transistor. A high efficiency step-down DC/DC converter can be easily composed of this IC with only a few kinds of external components, or an inductor and capacitors. The output voltage of the DC/DC converter has two kinds of output voltage, and alternative with the VSEL pin. The RP904 series are PWM/PFM step-down DC/DC converter, thus, when the load current is small, the operation can be switching into the PFM operation from PWM control if the user chooses the VFM mode. 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 in PWM mode. Latch-type protection circuit works to latch an internal driver with keeping it disable. To release the protection, after disable this IC with a chip enable circuit, enable it again, or restart this IC with p-MOSFET.
RICOH RP904Z Series 1A ∗∗ Step-down DC/DC Converter with Synchronous Rectifier Through mode handbook
The RP904Z Series are CMOS-based step-down DC/DC converters with Synchronous Rectifier featuring 1A∗∗ output current and have through mode. RP904Z includes an under-voltage lockout circuit (UVLO), a soft start circuit and a timer latch protection circuit. By simply using an inductor and capacitors as external components, a high-efficiency step-down DC/DC converter can be easily configured. The output voltage of DC/DC converter can be selected from 2 voltage by inputting signal to VSEL pin. The DC/DC converter is PWM/VFM manual switching control. RP904Z is able to select DC/DC mode or through mode by inputting signal to BYPASS pin. WLCSP-11-P2 package is available.
RICOH R5400N Series Li-ion/polymer 1Cell Protector Manual
The R5400N Series are high input voltage CMOS-based protection ICs for over-charge/discharge of rechargeable one-cell Lithium-ion (Li-ion) / Lithium polymer excess load current, further include a short circuit protector for preventing large external short circuit current and excess discharge-current. Each of these ICs is composed of three voltage detectors, reference units, a delay circuit, a short circuit detector, an oscillator, a counter, and a logic circuit. SOT-23-5 package is available.
RICOH R5402N Series Li-ion/polymer 1Cell Protector Manual
The R5402Nx Series is a high input voltage CMOS-based protection ICs for over-charge/discharge of rechargeable one-cell Lithium-ion (Li-ion) / Lithium polymer excess load current, further include a short circuit protector for preventing large external short circuit current and excess charge/discharge-current. Each of these ICs is composed of four voltage detectors, reference units, a delay circuit, a short circuit protector, an oscillator, a counter, and a logic circuit. SOT-23-5 package is available.
RICOH R5403x/R5405x Series Li-ion/polymer 1Cell Protector handbook
R5403x/R5405x Series is a high input voltage CMOS-based protection IC for over-charge/discharge of rechargeable one-cell Lithium-ion (Li-ion) / Lithium polymer excess load current, further include a short circuit protector for preventing large external short circuit current and excess charge/discharge-current. Each of these ICs is composed of four voltage detectors, a reference unit, a delay circuit, a short circuit protector, an oscillator, a counter, and a logic circuit. In addition to SOT-23-5 and SOT-23-6 packages, DFN(PLP)1616-6, DFN(PLP)1820-6 are also available.
RICOH R5470x/R5471x Series High Accuracy Li-ion/polymer 1Cell protector IC handbook
R5470x/R5471x series is a high input voltage CMOS-based protection IC for over-charge/discharge and over-current of rechargeable one-cell Lithium-ion/Lithium polymer battery. They can detect over-charge/discharge and excess-current of one-cell Li-ion, further include a short circuit protection. They consist of four voltage detectors, reference units, a delay circuit, a short circuit detector, an oscillator, a counter, and a logic circuit. Voltage accuracy is superior to previous items. DFN(PLP)2114-4B (for R5470K) and DFN(PLP)1616-6B (for R5471K) packages are available.
RICOH R5463K Series handbook
The R5463x series is a high-voltage CMOS-based protection IC for over-charge/discharge of rechargeable two-cell Li-ion/Lithium polymer, further include a short circuit protection circuit for preventing large external short circuit current and the protection circuits against the excess discharge-current and excess charge current. Each of these ICs is composed of six voltage detectors, reference units, a delay circuit, a short circuit protector, an oscillator, a counter, and logic circuits. DFN(PLP)1820-6B package is available.
RICOH R5462K Series handbook
The R5462x Series are high voltage CMOS-based protection ICs for over-charge/discharge of rechargeable two-cell Li-ion/Lithium polymer, further include a short circuit protection circuit for preventing large external short circuit current and the protection circuits against the excess discharge-current and excess charge current. Each of these ICs is composed of six voltage detectors, reference units, a delay circuit, a short circuit protector, an oscillator, a counter, and logic circuits. The over-charge detector threshold is high accuracy such as ±10mV(0°C∼50°C). DFN(PLP)1820-6B package is available.