Ricoh launches the new RP508 Series 6MHz Step Down DC/DC Converter in an ultra-small package
The RP508 is one of the world's smallest Step Down DC/DC Converter solutions with a package occupying only 1.44mm2 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. Other factors contributing to circuit board space reduction are the high operating frequency of 6.0MHz (resulting in the use of a small sized inductor of 0.47μH), an embedded driver transistor and synchronous rectification, which eliminates the need of an external diode.
The RP508 has two operating modes, selected by a mode pin: Forced PWM operating mode; the DC/DC converter switches at a fixed frequency rate in order to reduce noise. 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 currents.
Step Down DC/DC Converters need to function in a similar way to LDOs, providing power to advanced fast processors resulting in a load with fast transients. Portable gadget applications are able to operate in versatile modes, each with specific load characteristics. Additional power management parts, cascaded at the output of the DC/DC Converter and acting as a power source for an application, should have a reliable reference voltage.
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 RP508 if the input voltage is below the threshold of the minimum operating voltage.
An over-current limit circuit restricts the Lx peak current at each clock cycle; if the current exceeds the current limit (Ilxlim) it turns off the P-channel transistor. The over-current limit protects the DC/DC Converter and other electronic parts of the application from damage. The internal thermal shutdown circuit disables the RP508 as soon the junction temperature reaches 140°C and releases the protection circuit at 100°C.
The embedded soft-start function boots the internal circuits in 90μs. The output voltage is fixed internally by using a laser trimming process which can be set in a range from 0.8V to 3.3V in 0.1V increments. An optional auto-discharge function discharges the output capacitor quickly when the RP508 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 specialising 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 2013, Ricoh Group had worldwide sales of 1,924 billion yen (approx. 20 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 specialised 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 support European distributors and electronics designers and manufacturers with their applications or other enquiries about Power Management and Real Time Clock ICs.
Macnica was established in 1972 as a semiconductor distribution company headquartered in Yokohama, Japan, and has over 30 sales offices worldwide in eastern Asia, Europe and the USA. Total number of employees is over 1,900 and its consolidated revenue for fiscal 2010 was approximately US$2B. Macnica is famous for having an excellent engineering team of more than 500 application support engineers, IC designers and software developers with strong focus on providing technical support for its customers including custom design services. Macnica is continuing to extend its presence globally by having successful partners in strategic areas in the electronics market. Macnica's European headquarters was originally formed in the UK in 2006, and moved to Germany in March 2009, to increase efficacy of its service for European customers. Macnica can provide its customers end to end support from design-in to production through its global service network, regardless of the final destination of the product shipment to customers' manufacturing locations.