Renesas Electronics Introduces Lithium-Ion Battery Charge Controller IC with Support for Large-Current Rapid Charging

  Renesas Electronics Introduces Lithium-Ion Battery Charge Controller IC with
  Support for Large-Current Rapid Charging

Implements Highly Efficient 2 A Charging in an Ultracompact Package Measuring
                              2.47 mm × 2.47 mm

Business Wire

TOKYO -- December 20, 2012

Renesas Electronics Corporation (TSE: 6723), a premier supplier of advanced
semiconductor solutions, today announced the development of the R2A20057BM
lithium-ion (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 mounting area compactness especially
for mobile devices.

To solve these problems, the new R2A20057BM substantially 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.

Key Features of the R2A20057BM Battery Charge Controller IC:

(1) Approximately 62 percent reduction in chip surface area compared to
earlier Renesas solutions

The use of a very finer high-voltage-tolerance wafer process and wafer-level
package (WL-BGA, 25-pin, 0.4 mm pitch) allows Renesas to achieve a compact
chip size in the world’s smallest class of only 2.47 mm × 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.

(2) Support for USB Battery Charging Specification, Revision 1.2

The new 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.

(3) Support for both standalone operation and operation with I2C control

The new R2A20057BM can implement charging operation as a standalone product,
or can optionally be controlled through command input via Inter-Integrated
Circuit (I2C). The I2C control commands support a wide range of requirements,
covering charge start/stop control as well as the ability to change parameter
values such as charge control voltage, charging current, and input current
limit value.

(4) Built-in automatic load current distribution function

The new R2A20057BM can control the power supply path to the system while the
battery is charging using a built-in load current distribution function that
prioritizes supply of power to the system and adjusts the charging current
when the input current is limited, e.g., when power is being drawn via a USB
interface. This eliminates the need to add large external components such as
discrete switches when building a charging system.

(5) Built-in protection functions for safe battery charging

The built-in protection functions ensure safe charging by providing
input/output overvoltage protection, thermal protection, charge timer
protection, and thermistor-based battery temperature monitoring. The
high-precision charge control voltage of 4.20 V/4.35 V ±0.5 percent enables
safe charging of Li-ion batteries at the specified voltage.

Refer to the separate sheet for the main specifications of the R2A20057BM
battery charge controller IC.

Pricing and Availability

Samples of the R2A20057BM battery charge controller IC are available now,
priced at US$4.0 per unit. Mass production of the R2A20057BM devices is
scheduled to begin in January 2013 and is expected to reach a scale of 500,000
units per month in August 2013. (Pricing and availability are subject to
change without notice.)


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respective owners.

About Renesas Electronics Corporation

Renesas Electronics Corporation (TSE: 6723), the world’s number one supplier
of microcontrollers, is a premier supplier of advanced semiconductor solutions
including microcontrollers, SoC solutions and a broad-range of analog and
power devices. Business operations began as Renesas Electronics in April 2010
through the integration of NEC Electronics Corporation (TSE:6723) and Renesas
Technology Corp., with operations spanning research, development, design and
manufacturing for a wide range of applications. Headquartered in Japan,
Renesas Electronics has subsidiaries in 20 countries worldwide. More
information can be found at


Voce Communications, a Porter Novelli Company
Jessica Kerr, 415-975-2213
Renesas Electronics Corporation
Ai Kanehira, + 81-3-6756-5555
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