Fujitsu Announces Fast-Response DC/DC Converter IC for Consumer Electronics Fujitsu Microelectronics Limited

Fujitsu Announces Fast-Response DC/DC Converter IC for Consumer Electronics  Fujitsu Microelectronics Limited
Fujitsu Microelectronics Limited
Fujitsu Announces Fast-Response DC/DC Converter IC for Consumer
Electronics
Tokyo, November 16, 2009 Fujitsu Microelectronics Limited today announced a
new two-channel DC/DC converter (1) IC with fast
transient response, for use in digital consumer
products, such as LCD TVs and digital video
recorders. This new DC/DC converter IC, the
MB39A145, utilizes a "bottom detection comparator
method", and includes new enhanced circuits which
provide changes in voltage, for changes in current
to realize a more stable and low ripple output
voltage. This improved stability subsequently
reduces the number of external components that
are needed, such as condensers, thus reducing
space. The IC also includes Pulse Frequency
Figure 1. DC/DC Converter IC, MB39A145
Modulation (PFM)(2) that is highly efficient in
low-current ranges, and allows the equipment to
(unit: cm)
have low power consumption in stand-by mode.
Samples of the new converter IC will be available from January 2010.
Today's consumer AV equipment, such as LCD TVs and digital video recorders, have
increasingly larger screens, come with multiple functions and utilize advanced video
compression technologies. These are supported by ICs required to provide high-speed and
multi-functionality. To supply power to those ICs, power supplies must handle the requirements of
large currents and fast transient response.
To meet these needs, Fujitsu Microelectronics has been providing DC/DC converter ICs making
use of a "bottom detection comparator method" it introduced in 2005, to give fast transient
response to rapid changes in output current. This new IC enhances some of the comparator
circuits, to provide even greater stability in output voltage. In addition, for low current ranges
below 100 milli-Amperes(mA), the use of PFM reduces the power consumption in stand-by mode.
This IC was jointly developed by Fujitsu Microelectronics and Fujitsu VLSI Limited, and will be
exhibited at Embedded Technology 2009 to be held in Yokohama, Japan, from November 18-20.
Sample Price and Availability
Series
Price
Sample release
schedule
MB39A145
JPY 200
From January 2010
Sales Target
2 million units per month
Press Contacts
Fujitsu Semiconductor Limited Public and Investor Relations Department
Inquiries : https://www-s.fujitsu.com/jp/group/fsl/en/release/inquiry.html
Product Features
1. Fast transient response
In consumer AV equipment, such as large screen TVs, when starting the equipment or
when there are rapid contrast changes in the scenes of the video, fast transient response
and large current supply are necessary. By utilizing a "bottom detection comparator
method" in which detection cycle of the output voltage and reference voltage at transient
loads is sped-up, the new DC/DC convertor can minimize variations in the generated
output voltage when the change in load is large.
2. Energy efficient in low current ranges
In low current ranges below 100mA, or in stand-by mode, the PFM function reduces the
power used, thus contributing to a reduction in power consumption of the equipment it is
being used in. Additionally, as audio equipment require low-frequency noise measures,
the Prohibit Audio Frequency (PAF)(3) function can set the minimum frequency to 30 kHz.
3. Reduced component count leads to size reduction and ease of design of power
supply systems
The result of the enhanced comparator circuits is a more stable ripple voltage. The
improved stability reduces the number of necessary external components, such as
condensers, thus making the design of power supply systems easier.
For More Information
http://jp.fujitsu.com/group/fml/en/(Fujitsu Microelectronics)
Glossary and Notes
1 DC/DC convertor:
A circuit that converts a direct current voltage to a different voltage.
2 PFM (Pulse Frequency Modulation):
When in operation in this DC/DC converter, if frequency is reduced when in low current ranges, the
voltage conversion is done at higher efficiency, thus resulting in lower power consumption.
3 Prohibit Audio Frequency (PAF):
Stops operation in audible frequency ranges
Press Contact:
Fujitsu Microelectronics Ltd.
https://www-s.fujitsu.com/jp/group/fml/en/release/inquiry.html
About Fujitsu Microelectronics Limited (FML)
Fujitsu Microelectronics Limited designs and manufactures semiconductors, providing
highly reliable, optimal solutions and support to meet the varying needs of its customers.
Products and services include ASICs/COT, ASSPs, power management ICs, and flash
microcontrollers, with wide-ranging expertise focusing on imaging, wireless, automotive
and security applications. Fujitsu Microelectronics also drives power efficiency and
environmental initiatives. Headquartered in Yokohama, Fujitsu Microelectronics Limited
was established as a subsidiary of Fujitsu Limited on March 21, 2008. Through its global
sales and development network, with sites in Japan and throughout Asia, Europe, and the
Americas, Fujitsu Microelectronics offers semiconductor solutions to the global
marketplace.
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For more information: http://jp.fujitsu.com/fml/en/
All company or product names mentioned herein are trademarks or registered trademarks
of their respective owners. Information provided in this press release is accurate at time of
publication and is subject to change without advance notice.
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Main specifications of the power management IC, MB39A145
Operating Voltage Range
Power Method
Operating Frequency
Voltage Precision
Voltage Range
Start / Stop
PFM/PWM Functions
Protection Functions
Operating Temperature
Package
6.0V ~ 28.0V
Bottom detection comparator method, buck converter, 2
channel
310KHz, 620KHz, 1MHz (with internal preset)
±0.7% (room temp.)
0.7V ~ 5.5V
Soft start circuit independent of loads / discharge control
circuit
Selectable:
Auto switching mode, PWM mode
UVLO/OCP/OVP/UVP/OTP
-30°C ~ +85°C
Plastic TSSOP-24 pin (0.50mm pitch)
*1. PFM (Pulse Frequency Modulation): When in operation in this DC/DC converter, if frequency
is reduced when in low current ranges, the voltage conversion is done at higher efficiency, thus
resulting in lower power consumption.
*2. Voltage Precision: Precision measured on evaluation board and conditions set, by Fujitsu
Microelectronics.
*3. UVLO/OCP/OVP/UVP/OTP: Under Voltage Lock-Out / Over Current Protection / Over
Voltage Protection / Under Voltage Protection / Over Temperature Protection.
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