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Infineon adds RoHs-complaint chips to NovalithIC line

Posted: 24 Apr 2008 ?? ?Print Version ?Bookmark and Share

Keywords:highly integrated driver ICs? motor drive applications? power electronics?

Infineon Technologies AG has announced new members to its NovalithIC family of highly integrated driver ICs for motor drive applications, adding RoHs-compliant and faster-switching versions.

The NovalithIC combines three ICs in one small package, using latest chip-by-chip as well as chip-on-chip technologies. This device cuts by half the space needed on a PCB for power electronics driving motor applications with industry leading currents of up to 70A.

Auto and other apps
The NovalithIC is ideal for use in motor drive applications like automotive heating, ventilation air-conditioning systems, seat belt systems and fuel pumps as well as in industrial applications such as battery driven power drillers and grinding machines. With the latest version, the BTN7971B, Infineon achieved to double the switching speed of the previous devices, further reducing the switching losses by 50 percent.

�With our new �green? and faster versions of NovalithIC, designed for a broad range of automobile applications in the area of safety, body & comfort we help to increase the energy efficiency of electrical motor applications and of automobiles in general,? said Georg Lipperer, Senior Director and Head of Marketing at the Automotive Power Business Unit at Infineon Technologies. �Infineon uses state-of-the-art chip-by-chip and chip-on-chip package technologies which make the NovalithICs extremely robust while offering it in a lead-free package. This is how we understand automotive excellence.?

IC architecture
The family of NovalithIC presents a fully integrated high current half bridge for motor drive applications. A NovalithIC chip contains one p-channel highside MOSFET and one n-channel lowside MOSFET with an integrated driver IC in one package. As the on state resistance is typically just 16m? and the quiescent current just 7?A the device has a very energy efficient footprint marking another benefit of this device. The architecture eliminates the need for a charge pump thus minimizing EMI.

As a motor driver IC with logic level inputs, diagnosis with current sense, over- and undervoltage and many other features has been integrated into the NovalithIC the interfacing with a microcontroller doesn�t require additional efforts. Since the NovalithIC supports applications up to 70A new applications like seatbelt pretensioner can be realised for the first time with such a highly integrated device.

Today a mid-range car uses up to 50 small electrical motors. They are used to change the position of seats, to lift windows and to operate the sun roof. In the premium car segment this number already grows up to 70 motors. But not all motor drive applications make use of PWM technology, reducing the energy required for the desired features significantly.

Air-conditioning fans in many vehicles are already fitted as standard with a PWM control unit. However a substantial proportion of fans on the market still use a linearly driven MOSFET as an external resistance between fan and motor, turning between 80W and 130W of power into waste heat. For example a mean reduction in heat loss of around 80W would equal a saving of 1.9g CO2/km or 0.08l gasoline per 100km. The additional expense of installing a PWM fan controlled by a NovalithIC would pay for itself in just half a year, or after just 8,000km.

According to independent market analysts this will lead to an increased demand for NovalithIC and its kind. The motor drive market is expected to grow stronger than the automotive market in general and will reach a CAGR (2008-2013) over 10 percent.

Availability, packaging and price
Available immediately are the green versions of the NovalithIC BTN7930, BTN7960, BTN7970. The model BTN7930 is earmarked for electrical motors driving currents up to typically 32A, whilst the version BTN7960 drives currents of up to typically 47A and the BTN7970 up to typically 70A. All mentioned NovalithICs are suitable for PWM applications with frequencies of up to 25kHz.

The new BTN7971 comes with improved switching behaviour. With the same PWM application and the same current the switching losses will be reduced by 50 percent. Engineering samples of the BTN7971 are available now. In quantities of 100,000, the BTN 7960 in a Pb-free TO-263 package is priced at approximately $2.80.

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