Battery Power - March/April 2013 - (Page 21)

ICs & Semiconductors Lithium-Ion Battery Charge Controller IC with Support For Large-Current Rapid Charging Renesas Electronics Corp. has developed of the R2A20057BM Li-Ion battery charge controller IC for mobile devices employing one cell Li-Ion batteries, such as digital still cameras and smartphones. The R2A20057BM integrates a step-down DC-DC converter and supports 2 A large-current charging in very small package in the world’s smallest class. As digital still cameras, smartphones and other mobile devices gain higher levels of functionality, their current usage increases, requiring bigger capacity of Li-Ion batteries, and larger currents for charging these batteries. However, systems for large-current charging employ multiple power metal-oxide-semiconductor field-effect transistors (MOSFETs) and discrete passive components, and large-scale heat emission structure under large-current handling, while they need mount- ing area compactness especially for mobile devices. To solve these problems, the R2A20057BM reduces the mounting area by integrating multiple power MOSFETs and charging circuits in a single chip, using a wafer-level package, a packaging technology that can also supply large amounts of current due to reduced package resistance. In addition, it incorporates a highly efficient on-chip step-down DC-DC converter to realize large-current charging while keeping heat generation to a minimum. The use of a very finer high-voltage-tolerance wafer process and wafer-level package allows Renesas to achieve a compact chip size in the world’s smallest class of 2.47 mm by 2.47 mm. In addition, the integrated 2 MHz high-frequency step-down DC-DC converter enables a use of compact multi-layer-chip inductors as the external devices. The 25 V on-chip, high-input voltage-tolerance enables a built-in overvoltage protection circuit and eliminates an external overvoltage protection circuit, contributing to a substantial reduction in the mounting area. The R2A20057BM automatically identifies six USB port types including the three types stipulated in the USB Battery Charging Specification, Revision 1.2, and sets the input current limit value automatically. March/April 2013 • Battery Power 21

Table of Contents for the Digital Edition of Battery Power - March/April 2013

Battery Power - March/April 2013
Editor's Choice
GTS and RGIS Launch Battery Test & Replace Service for Mobile Devices
Leyden Energy Raises $10 Million for Commercialization of Silicon Anode Mobile Pouch Cells and Automotive Start-Stop Batteries
Circuit Protection Approach for High-Rate Discharge Li-Ion Battery Application
Battery Power 2013 Conference Preview
Simplify Peripheral Connectivity and Extend Battery Life in Mobile Applications
Managing Lithium-Chemistry Batteries: It’s Mostly About Their Temperature
Lead Acid Batteries: A Proven Technology Marches Forward
New Products
Charging & Testing
Power Supplies & Conversion
ICs & Semiconductors
Industry New

Battery Power - March/April 2013