Ricoh launches new RP602 1.5 A Buck-Boost DC/DC Converter with Synchronous Rectifier
Amstelveen, the Netherlands, 31 July 2015 – Ricoh Europe (Netherlands) B.V. Semiconductor Support Centre has launched a new PWM/VFM Buck-Boost DC/DC Converter RP602 with Synchronous Rectifier. The new product is a powerful solution that requires only a small footprint and small external components on the circuit board.
The RP602 is designed to operate as a boost as well as a buck DC/DC Converter. It is especially convenient in case of a required output voltage of in between the maximum and minimum battery voltage level. When the battery is fully charged, it has to lower the voltage (buck) and when the battery is nearly discharged, it has to increase the battery voltage (boost). The RP602 switches automatically between the DC/DC Converter topologies.
A compact solution embedded into a Wafer Level Chip Scaled Package, the RP602 occupies only 3.92mm2 of circuit board space. This contributes to the product efficiency when used on high density and small circuit boards in portable gadget applications, such as smartphones, smart/fitness watches, tablets, wearable devices and communication modules. The RP602 is especially suitable for 3.3V power supply of analogue devices, such as Wi-Fi modules. Other factors contributing to circuit board space reduction are the high operating frequency of 2.6MHz (resulting in the use of a small sized inductor of 1.0µH), an embedded driver transistor and synchronous rectification, which eliminates the need of an external diode.
The RP602 has two operating modes, selected by a mode pin:
- Forced PWM operating mode; the DC/DC converter switches at a fixed frequency rate, which has a lower output noise versus VFM operating mode.
- PWM/VFM auto switching mode; the DC/DC Converter switches between PWM and VFM mode automatically, resulting in the best efficiency level at either low or high output current demand.
In terms of circuit protection, various circuits are embedded to ensure a safe operation of the power supply. An under voltage lockout function (UVLO) disables the RP602 if the input voltage is below the threshold of the minimum operating voltage. An over-current limit circuit protects the DC/DC Converter and other electronic parts of the application from damage caused by excessive heat, in either optional latched or reset type current limit. The internal thermal shutdown circuit disables the RP602 as soon as the junction temperature reaches 150°C and releases the protection circuit at 110°C.
The embedded soft-start function boots the internal circuits in 1ms. The output voltage version is internally fixed by the factory and can be set in a range from 2.7V to 4.2V by using a laser trimming process. An optional auto-discharge function discharges the output capacitor quickly when the RP602 is disabled by the CE pin; an embedded transistor connected at the Vout pin is turned on and shorts the capacitor to ground.
Ricoh is a global technology company specializing in office imaging equipment, production print solutions, document management systems and IT services. Headquartered in Tokyo, Ricoh Group operates in about 200 countries and regions. In the financial year ending March 2014, Ricoh Group had worldwide sales of 2,236 billion yen (approx. 21.7 billion USD).
The majority of the company's revenue comes from products, solutions and services that improve the interaction between people and information. Ricoh also produces award-winning digital cameras and specialized industrial products. It is known for the quality of its technology, the exceptional standard of its customer service and sustainability initiatives.
Under its corporate tagline, imagine, change, Ricoh helps companies transform the way they work and harness the collective imagination of their employees.
In March 2001 Ricoh Europe (Netherlands) B.V. established the Semiconductor Support Centre to represent the services of Ricoh Electronics Devices Company Japan in Europe. The Semiconductor Support Centre supports European distributors and electronics designers and manufacturers with their applications or other enquiries for Power Management and Real Time Clock ICs.
In July 2013 Ricoh Electronics Devices Company became ISO / TS16949:2009 certified; it is an important additional improvement of our quality management system for the design, development and manufacturing of semiconductor products for the automotive market.
For further information, please visit our Semiconductor product website www.ricoh.com/LSI