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FUJI ELECTRIC JOURNAL 2000 Vol.73-No.8
Present Status and Prospects for Fuji Electric's IC Technology and Products
Toshio Komori
Fuji Electric has developed ICs (integrated circuits), under the keywords of power semiconductor, intelligence and CMOS (complementary metal-oxide semiconductor) analog, and has mainly concentrated its efforts on ICs for power supply units characterized by high voltage, high precision and low power consumption. We have also developed products using our original sensor technology such as autofocus ICs for cameras and pressure sensors for automobiles. This paper gives an outline of Fuji Electric's IC technology and products, focusing on ICs for power supply units using CMOS analog technology.
PWM Control IC with Power-Saving Function for Light Load
Hiroshi Maruyama, Hironobu Shiroyama
Recently, to meet the global environmental problem, energy saving has been taken seriously, and standby power consumption in each product is being standardized. To reduce power consumption, Fuji Electric is promoting replacement of former products using bipolar process with new ones using high-voltage CMOS (complementary metal-oxide semiconductor) process. From among the new products, this paper gives an outline of the newly developed PWM (pulse-width modulation) control IC (integrated circuit) with power-saving function using CMOS.
1-Channel CMOS Control ICs for DC-DC Converters
Ichiro Nomura
Having the advantage of small size, light weight and high efficiency, DC-DC converters are widely used for stable DC power supply systems. Because of growing concern for the protection of environment, still higher efficiency is required. To meet the requirement, Fuji Electric has attained the following: (1) low operating current of 1.2 mA, and standby current of 40µA using CMOS (complementary metal-oxide semiconductor) (2) direct driving circuit with low output on-resistance (high side: 12
, low side: 5) for external MOSFET
(metal-oxide semiconductor field-effect transistor) (3) TSSOP-8 package
and less external parts (9 min.) available for small power supply.
Control IC for a 6-Channel Switching DC-DC Converter Compatible with Synchronous Rectifiers
Kazuya Endo
Portable electronic appliances such as video cameras require small size, light weight and long operation with batteries. To meet these requirements, power supply systems for these appliances are required to be small and light, of low current consumption and of high efficiency. Fuji Electric has developed a control IC for 6-channel switching power supply suitable for multiple output configuration and partly compatible with synchronous rectifier systems to improve power supply efficiency. This paper describes the ratings, features and application examples of this control IC.
Power Supply IC for Cellular Phones
Isao Sano, Hiroaki Kamo, Jun Yabuzaki
Cellular phones with the advantage of convenience at any time, at any place and to any place have attained the present high diffusion as the result of improvements in size, price and power dissipation, Fuji Electric has marketed a newly developed control IC (integrated circuit) for cellular phone power supply. This IC of a 48-pin package incorporates 8 LDO regulators, a negative voltage regulator for power amplifier gate bias and an operational amplifier.
IC Technology for High-Frequency Switching DC-DC Converters
Zenchi Hayashi, Yasushi Katayama, Satoshi Sugahara
To meet the tendency of portable electronic equipment toward small size, thinness and light weight, Fuji Electric has developed a control IC for small and thin switching DC-DC converters for lithium ion secondary batteries. The IC can perform high-frequency PWM (pulse-width modulation) control up to 10 MHz (switching frequency can be set at 1 to 6 MHz), and includes built-in 30 V high-speed switching MOSFET (metal-oxide semiconductor field-effect transistor). Constructions of single output back converter or boost converter are possible, driving in a synchronous rectifying system is also possible. Decreasing the number of external compornents necessary has reduced the size of DC-DC converter circuits.
Mixed Analog-Digital IC Technology for Power Supply
Shigeru Kamiya, Tomomi Sano, Masahiro Sasaki
Improvement in IC (integrated circuit) integration has realized a system on a chip, including analog and digital functions. Fuji Electric has developed technology for an intelligent power supply IC by mounting a microcomputer on the chip of a power supply analog circuit. This paper gives an outline of a lithium ion battery charging IC capable of high-accuracy control on final battery voltage. The IC with a voltage reference of
0.5% accuracy attained high-accuracy final
battery voltage control within a final voltage error of0.7%.
High-Precision Analog Circuit Technology for Power Supply Integrated Circuits
Akira Nakamori, Takeshi Suzuki, Kimiyoshi Mizoe
With the recent rapid spread of portable electronic appliances, specification requirements such as compact power supply and long operation with batteries have become severer. Power supply ICs (integrated circuits) are required to reduce power consumption in the circuit and perform high-precision control. To meet these requirements, Fuji Electric develops high-precision CMOS (complementary metal-oxide semiconductor) analog technology. This paper describes three analog circuit technologies of a voltage reference, an operational amplifier and a comparator as circuit components particularly important for the precision of power supply ICs.
CMOS Analog Integrated Circuit Design Technology
Hidetoshi Fujimoto Akira Fujisawa
In the field of the LSI (large scale integrated circuit) in rapid progress toward high integration and advanced functions, CAD (computer-aided design) technology has become indispensable to LSI development within a short period. Fuji Electric has developed design technologies and automatic design system to develop high-quality analog ICs (integrated circuits), including power supply ICs, within a short period. This paper describes CMOS (complementary metal-oxide semiconductor) analog macro cell, circuit simulation, automatic routing, and backannotation technologies.
Analog C/DMOS Device-Process Technology
Akio Kitamura, Osamu Sasaki
In the field of power supply ICs (integrated circuits), there are strong demands for small size, light weight, low power consumption and high precision. Accordingly, requirements to devices become severer than before. This paper describes high-precision 1µm-rule analog C/DMOS (complementary/diffused metal-oxide semiconductor) device-process technology developed to meet these requirements.
IC Packages for Power Supply Systems
Takafumi Kouda
As high-density mounting has realized small, light, and advanced-function electron devices recently, IC (integrated circuit) mounting technologies including packaging technology have successively been developed. This paper outlines Fuji Electric's IC packages and mounting technology, and describes plastic package for power supply ICs. In addition, it refers to its development of lead-free IC packages for power supply systems, a current topic of conversation.
Small, Wide-Angle Autofocus Modules
Akio Izumi
Compact cameras are improving in performance, size and weight by introducing a zoom function. The performance of compact cameras greatly depends on the autofocus system. Fuji Electric has developed a small, low-priced autofocus module capable of wide-angle distance measurement. This module with an analog data output type sensor and a new optical system can be used for digital cameras and compact cameras with the
2-class zoom lens. This paper describes the configuration,
structure and features of the module.
EMI-Prevention Pressure Sensor
Kazuyuki Katoh, Shigeru Shinoda
Semiconductor pressure sensors are widely used in automobiles, medical service and measurement. In the automobile field, there is a growing demand for high precision, low-priced pressure sensors particularly with immunity to EMI (electromagnetic interference) strictly required in recent years. Fuji Electric has marketed small, high-reliability, low-priced pressure sensors which integrate on a chip the sensing part, the amplifier and adjuster circuit, and further, the preventive measure against EMI, formerly a main cause of cost increase. This paper outlines the features, design, characteristics and specifications of this EMI-prevention pressure sensor.
