DC/DC Converter IC offers fast transient times.
November 19, 2009 -
Model MB39A145, 2-channel DC/DC converter IC utilizes bottom detection comparator method that compares output voltage to reference voltage using high-speed comparator, minimizing variations in output voltage when load is high. Pulse Frequency Modulation function reduces power that is used during operation below 100 mA or in stand-by mode. Operating in temperatures from -30 to +85°C, unit has operating voltage range of 6.0-28.0 V with voltage precision of ±0.7%.
(Archive News Story - Products mentioned in this Archive News Story may or may not be available from the manufacturer.)
Original Press release
Fujitsu Semiconductor Europe
Am Siebenstein 6-10
Dreieich-Buchschlag, , D-63303
Germany
Fujitsu Announces Fast Transient Response DC/DC Converter IC
Langen, Germany, November 16th, 2009 - Fujitsu Microelectronics Europe (FME) today announced a new two-channel DC/DC converter IC with fast transient response times, for use in digital products, such as LCD TVs, and digital video recorders. The MB39A145 utilises a 'bottom detection comparator method', and includes new comparator circuits that provide changes in voltage for changes in current to realise a more stable, 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 Modulation (PFM) that operates in currents below 100mA, enabling the IC to provide high efficiency in all current ranges and reduce the power consumption of end equipment in stand-by mode.
Today's AV equipment incorporates increasingly large screens, multiple functions and advanced video compression technologies. These features are supported by ICs that provide multiple functions at high-speed. Power supplies for these ICs have to handle the requirements of large currents and fast transient response times. The MB39A145 DC/DC converter IC was jointly developed by Fujitsu Microelectronics and Fujitsu VLSI Limited to meet these needs.
Product Features
1. Fast transient response
When turning on AV equipment, such as a large screen TV, or when there are rapid changes in contrast in the scenes of a video, fast transient response times and a large current supply are necessary. Fujitsu's new DC/DC converter IC provides these features by utilising a 'bottom detection comparator method' that compares the output voltage to a reference voltage using a high-speed comparator. The result is that variations in the generated output voltage are reduced to a minimum when the load is high.
2. Energy efficient in low current ranges
In low current ranges below 100mA, or in stand-by mode, the integrated PFM function reduces the power used, thus contributing to a reduction in power consumption of the equipment that it is being used in. Additionally, as audio equipment requires low frequency noise measures, the Prohibit Audio Frequency (PAF) function can set the minimum frequency to 30kHz so that low frequency noise from the power supply is reduced.
3. Easier design of smaller power supply systems
With enhanced comparator circuits, which provide changes in voltage for changes in current, it is possible to operate the MB39A145 even with no ripple in the output voltage. The improved stability reduces the number of external components needed on the output, thus reducing the size of power supply systems and making their design easier.
Main specifications of the power management IC, MB39A145
Operating Voltage Range 6.0 to 28.0V
Power Method Bottom detection comparator method,
Buck converter, 2-channel
Operating frequency 310kHz, 620kHz, 1MHz (with internal
preset)
Voltage Precision*2 ±0.7% (room temp.)
Voltage Range 0.7 to 5.5V
Start / Stop Soft start / discharge control with no load
PFM*1/PWM Functions Selectable: Auto switching mode, PWM mode
Protection Functions UVLO/OCP/OVP/UVP/OTP*3
Operating Temperature -30 to +85°C
Package Plastic TSSOP 24-pin (0.50mm pitch)
*1. PFM (Pulse Frequency Modulation): is a modulation method for representing an analogue signal using only digital levels. In the operation of this DC/DC converter, at low current ranges, if frequency is reduced, power consumption can be lowered resulting in higher efficiency in voltage conversion.
*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.
Availability
Samples of the MB39A145 will be available from January, 2010 in a 24-pin plastic TSSOP.
About Fujitsu Microelectronics Europe
Fujitsu Microelectronics Europe (FME) is a major supplier of semiconductor products. The company provides advanced systems solutions to the automotive, digital TV, mobile telephony, communications, networking and industrial markets. Engineers from design centres dedicated to microcontrollers, graphics controllers, mixed-signal, wireless, multimedia ICs, ASIC products and software development, work closely with FME's marketing and sales teams throughout EMEA to help satisfy customers' systems development requirements. This solutions approach is supported by a broad range of advanced semiconductor devices, IP, building blocks and software.
For more information, please visit: http://emea.fujitsu.com/microelectronics
Issued on behalf of:
Fujitsu Microelectronics Europe
Pittlerstrasse 47
63225 Langen
Germany
Tel: +49 (0)6103 69 00
E-mail: jim.bryant@fme.fujitsu.com
Contacts: Jim Bryant
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