FUJI ELECTRIC JOURNAL 2001 Vol.74-No.10

IC


Present Status and Prospects for Fuji Electric's IC Products and Technologies
Toshio Komori
Fuji Electric has continued developing products laying stress on power supply ICs (integrated circuits) based on the high-voltage analog CMOSIC (complementary metal oxide semiconductor IC) technology. It also handles ICs for the PDP (plasma display panel) driver utilizing its excellent high-voltage technology. In addition, the distinctive sensor IC with intelligent functions has been developed into AF (auto-focus) ICs for cameras and pressure sensors for automobiles. This paper out-lines Fuji Electric's distinguished products and technologies, such as the new products of power supply ICs as the core and newly developed high-reliability 700 V one-chip power IC technology, new model AF modules, and PDP driver ICs.


CMOS Power Factor Control IC
Masato Kashima, Hironobu Shiroyama
Recently, harmonic current generation in the capacitor input rectifier circuit for producing DC voltage widely used in electronic equipment accompanied by a power factor drop has become an issue, and there has come a movement to establish legal regulation. The active filter system is widely used as a preventive measure. This paper out-lines Fuji Electric s newly developed peak current mode control CMOSIC (complementary metal oxide semiconductor integrated circuit) as an active filter control IC.


Power Supply IC for Low Power AC Adapters
Yasushi Katayama
Recently, AC adapters have been required to be small, light-weight, low-cost and low-standby-power-consumption. To meet these requirements, Fuji Electric has developed a power IC (integrated circuit) for switching power supply control with a 700 V power MOSFET (metal-oxide-semiconductor field-effect transistor) and a PWM (pulse width modulation) controller integrated on a chip. This paper outlines the newly developed power supply IC for 5 W class low power AC adapters. This IC achieved low supply current of 200microA at MOSFET switching by utilizing low-current-consumption circuits and optimizing the internal circuits.


Two-Channel DC-to-DC Converter Control ICs for General Use
Ichiro Nomura, Tamotsu Yoneda
In portable electronic equipment, power consumption increases with advanced functions, while there are requirements for long, continuous operation and light weight ; therefore, the use of DC-to-DC converters, small high-efficiency power supply, are expanding rapidly. To meet the requirement, Fuji Electric has developed CMOS (complementary metal-oxide semiconductor) type 2-channel DC-to-DC converter control ICs (4 models). These realizes the wide operation range of power input 2.5 to 18 V and frequency 50 kHz to 1 MHz, direct MOSFET (MOS field-effect transistor) drive, and low current consumption of 1.7 mA. An application example of power supply of output 2 to 3 W attains high efficiency of 82 to 90%.


Power Supply ICs for LCD Panels
Masayuki Yamadaya
The mainstream of displays for electronic equipment has become LCDs (liquid crystal displays). Actually the voltage and power supply sequence required for LCD panels vary with panel manufacturers and types. In addition, operation with higher frequency is required to reduce the size of power supply circuits. To meet these requirements, Fuji Electric has added the new types of three-output FA3686V and two-output FA3687V to the former power ICs (integrated circuits) for LCD panels. This paper describes an outline of these ICs.


Charge Pump Booster IC
Yutaka Yoshida, Hirohisa Arai
Portable electronic equipment that has rapidly diffused recently such as PDAs (personal digital assistants) and cellular phones requires small, noiseless, low-power-consumption voltage boosters to operate analog ICs and radio communications devices. To meet these market needs, Fuji Electric has developed a charge pump booster IC (integrated circuit) with a charge pump booster circuit and a series regulator for suppressing ripples caused by switching operation integrated on a single chip. This paper describes an outline of this IC.


DC-to-DC Converter-Controller IC for White LEDs
Hiroaki Kamo, Isao Sano
Fuji Electric has developed a DC-to-DC converter-controller for driving white LEDs (light emitting diodes) used in the display panel of portable electronic equipment. This IC boosts voltage up to a maximum of about 18 V from battery voltage and is capable of driving and controlling three white LEDs in series with high efficiency as well as constant current controlling and multiple-step luminance controlling with an 8-bit DAC (digital analog converter). This paper describes an outline of electrical characteristics and the major circuits of this IC.


Power Management IC for a Cellular Phone with a Li-Ion Battery Charger
Hirohisa Arai, Yutaka Yoshida, Jun Yabuzaki
Portable electronic equipment has recently been improved in respect of (reduced) size and weight and advanced functions. In particular, cellular phones, which are characteristic of portability and convenience to make calls possible anywhere, have attained present high penetration owing to reduction in size and price and standby / talk time extended by low power consumption. To meet the market needs, Fuji Electric developed 48-pin-packaged power supply IC (integrated circuit) for cellular phones which integrates six regulators, a battery charging function, various drivers, a speaker amplifier, and other auxiliary circuits.


Second-Generation PDP Address Driver IC
Seiji Noguchi, Hitoshi Sumida, Kazuhiro Kawamura
To meet the diffusion of color PDPs (plasma display panels), the driver IC (integrated circuit) for PDPs is strongly required to improve performance and reduce cost. Fuji Electric has developed a 2nd-generation PDP address driver IC that satisfies these requirements. The absolute maximum voltage of this IC is 85 V. This IC realizes the reduction of chip area by using power devices of low on-resistance for the output circuit and making isolation regions slim and also the low power consumption and high-speed operation by using the 1microm rule and improving the circuitry. This paper gives an outline of this IC and its device and process technologies.


Auto-Focus module with a High Optical Quality IC Package
Sachiaki Komatsu
Recently film cameras require the higher performance and more compact size. In it, range finders, which are called as auto-focus (AF), are the key components. Moreover superior range finders are also indispensable for digital still cameras (DSCs). Fuji Electric has developed the smaller and better performance AF module, which contains the new sensor with analog output and the high optical quality package for film camera and DSC. This paper describes its configuration and features.


Automotive Pressure Sensor with Digital Trimming
Katsumichi Ueyanagi, Mutsuo Nishikawa, Katsuyuki Uematsu
This paper introduces the automotive pressure sensor with digital trimming that uses an EPROM (erasable programmable read-only memory) based on the CMOS (complementary metal oxide semiconductor) process. With a piezoelectric resistance type pressure sensor, the sensor part design on the crystal face (100) used for the CMOS, circuitry configuration using an EPROM and a D-A (digital to analog) circuit, immunity to noise and surge required for automotive use, and reliability design were investigated. As the result of these investigations into designing details, a high-precision pressure sensor with high reliability for automotive use was realized.


New 700 V One-Chip Power IC Technology
Yoshio Tsuruta, Gen Tada, Masaru Saitou
AC adapters and battery chargers used in portable electronic equipment are strongly required to be of small size, light weight and low power consumption. To meet these requirements, Fuji Electric has developed high-reliability power IC (integrated circuit) technology for switching power supply with a 700 V power MOSFET (metal-oxide-semiconductor field-effect transistor) and a control IC integrated on one chip. This paper describes the high-reliability power MOSFET technology that uses double-metal-field-plate structure and the planar process, the control circuit technology that realizes smaller size and higher precision, and examples of IC products that utilize this technology.


Low On-Resistance Trench Lateral Power MOS Technology
Akio Sugi, Mutsumi Sawada, Naoto Fujishima
Power supply ICs (integrated circuits) and driver ICs in portable electronic and communicative equipment integrate power MOSFETs (metal-oxide-semiconductor field-effect transistors) as switching devices. Lower on-resistance and higher switching speed for these power MOSFETs become of greater importance. Fuji Electric has developed a high-density, low on-resistance trench lateral power MOS FET (TLPM / S). The TLPM / S sttains 60% of the on-resistance of planar MOSFETs by increasing channel density and reducing device pitch. Also it realizes excellent switching characteristics by reducing Miller and channel capacitance.

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