Renesas Electronics Introduces the RAA20770X Series Fast-Response Point of
Load Converter ICs With Ultra-Miniature Packaging
High-Efficiency Mini-POL Converter Features Wafer-Level Chip Size Package for
75-Percent Reduction in Size, Very Low Thermal Resistance
SANTA CLARA, Calif. -- November 29, 2012
Renesas Electronics Corporation (TSE:6723), a premier supplier of advanced
semiconductor solutions, has developed the RAA20770X Series of mini-POL [Note
1] converters for ASICs and other large-scale logic circuits in a wide variety
of application fields, including personal computers, servers, industrial,
office automation and networking equipment. The RAA20770X Series devices
achieve the industry's highest level of miniaturization and power density.
Renesas is now releasing six products with different current supply ratings
Recently, there have been two changes in power supplies market. The first is
the requirement for reduced power consumption to achieve an energy-saving
society, and the second is the increasing diversity in supply voltages
required by increasingly highly functional semiconductor products such as
microcontrollers (MCUs) and SoC devices.
To satisfy the first requirement, the new RAA20770X devices perform
high-efficiency power conversion during normal load and – typically 90 percent
of the time – also execute the frequent transitions to low-power mode quickly.
As a result, they reduce overall system power consumption and help enable an
To satisfy the second requirement, although mounting area is spreading
according to electric source increasing, the RAA20770X devices achieve a size
reduction of about 75 percent compared to earlier Renesas products, featuring
an ultra-miniature wafer-level chip size package that is essentially the same
size as the chip itself. Furthermore, since no wired connections are required
within the package, resistance in the wiring is reduced, which contributes to
more efficient voltage conversion. The RAA20770X Series represents the first
devices with this level of integration in this small a package size.
Key Features of the RAA20770X Series POL Converter ICs:
(1) Contributing to system miniaturization with an area reduced by about 75
In the RAA20770X products, Renesas adopted a wafer-level chip size package to
achieve POL devices that can supply large amounts of current in a miniature
form factor making it possible to reduce the IC’s internal wiring resistance
and package wiring resistance to an absolute minimum. For example, in the
RAA207701GBM, which has a maximum rated current of 10 A, the package size is
an extremely small 2.7 × 3.4 mm, which corresponds to a roughly 75 percent
reduction in package size compared to earlier Renesas SiP POL products.
Furthermore the thermal resistance from the package surface to the chip
junction area is an extremely low 1°C/W, allowing a high thermal dissipation
design when used with a heat sink and air flow.
(2) Support for increased battery life
The next generation of notebook PCs will require functions similar to the
information update and acquisition in standby mode (Connected Standby)
provided by current tablet PCs and cell phones. It will be necessary to limit
power consumption as much as possible in Connected Standby mode. To address
this need, the RAA20770X Series devices adopt a constant on-time control
method [Note 2], and in low power consumption modes where the load current is
low, they achieve a low power consumption of about 0.5 µW. Another advantage
of this constant on-time control method is that the POL converter's power
consumption can be reduced by lowering the operating frequency, achieving the
reduced power consumption of 1.6 mW when there is no load and 0.5 µW in
standby mode. The constant on-time control method also provides the advantage
of fast response. For example, even when rapid current increases occur when
electronic equipment switches from an energy-saving mode to normal operation,
the converter can respond instantly by increasing the operating frequency.
(3) Ease of design for high-reliability power supply systems
The RAA20770X Series devices integrate the various protection functions, such
as overcurrent, overvoltage, and thermal protection, required in POL
converters – all on the same chip. As a result, these devices support safe and
highly flexible high-reliability power supply system design with a minimal
number of external components for easier design and reduced bill of materials.
Furthermore, the output voltage and operating frequency can be modified to
match the application they are used in, offering flexibility for operation in
a wide range of applications.
(4) Support for single-voltage power supply design
The new RAA207703GBM, RAA207704GBM, and RAA207705GBM devices include an
integrated 5 V low dropout regulator (LDO) circuit, which can provide the 5V
required internally by the power supply controller, thus eliminating the need
for an external power supply. This enables a system to operate from just a
single-voltage using, for example, a 12 V power supply rail.
In addition to combining the power supply controller and driver controller IC,
the RAA20770X Series devices integrate, on a single chip, two power MOSFETS
[Note 3] that are optimal for POL converters that step down an input voltage
of 5 V or 12 V to the 1 V or 3.3 V used by large-scale ICs such as ASICs. For
example, the RAA207701GBM device features a maximum rated current of 10 A, and
for a 12 V input and 3.3 V output, it can achieve high-efficiency power
conversion from the low-current area to the high-current area – in particular,
an 89 percent efficiency at 10 mA, a 95 percent efficiency at 4 A, and a 92
percent efficiency at 10 A . This power conversion efficiency contributes to
lower power overall in end-use products.
[Note 1]: POL: Point of load. A POL converter is a step down DC-DC converter
that is located close to the load that consumes the power.
[Note 2]: The constant on-time control is a method in which the PWM on time is
constant and the operating frequency is adjusted automatically according to
the load current.
[Note 3]: MOSFET: Metal oxide semiconductor field-effect transistor.
Pricing and Availability
Samples of the RAA20770X Series POL Converter ICs will start in December 2012.
While the sample price for these new products will differ depending on the
output capacity, the sample price for the RAA207700GBM with a maximum rated
current of 15 A will be US$2.05 per unit. Mass production of the RAA20770X
devices is scheduled to begin in March 2013 and is expected to reach a scale
of 500,000 units per month in July 2013. (Pricing and availability are subject
to change without notice.)
All other registered trademarks or trademarks are the property of their
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 www.renesas.com.
Voce Communications, a Porter Novelli Company
Jessica Kerr, 415-975-2213
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