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National Semiconductor beefs up analog portfolio

Posted: 27 Oct 2008 ?? ?Print Version ?Bookmark and Share

Keywords:analog? LED powertrain?

National Semiconductor Corp. unveils a series of innovative, energy-efficient automotive products that enable emerging applications in LED lighting, powertrain, safety and infotainment systems.

To prevent severe battery drain when a car is parked for extended periods of time, National's LM26003 switching regulator features a low-current sleep mode to maintain efficiency under light-load conditions and current-mode control for accurate regulation over a wide input voltage range of 4.0V to 38V. Available now in a 20-pin TSSOP package, the LM26003 switching regulator is priced at $3.90 each in 1,000-unit quantities.

For powering automotive systems where the supply can vary both above and below the output voltage, National's PowerWise LM5118 DC/DC regulator controller features a unique buck-boost control that ensures seamless control from the electronic modules even when battery voltage falls momentarily down from 4V. Available now in a 20-pin thermally enhanced TSSOP package, the LM5118 is priced at $2.92 each in 1,000-unit quantities.

Meanwhile, National's family of PowerWise LED drivers power 1W to 5W high-brightness LEDs. These LED drivers provide a wide input voltage range, constant current to regulate LED brightness, a low-feedback voltage to minimize power dissipation and zero shutdown current to maximize efficiency. Dimming, protection and thermal control features are suitable for a wide range of lighting applications.

For exterior lighting such as headlights, day time running lights, fog lights and rear combination lamps as well as interior lighting such as dome lighting and instrumentation, National's PowerWise LM3421 and LM3423 high-voltage LED drivers drive three or more LEDs per string. Offered in a small TSSOP package, the LM3421 is priced at $1.55 each and the LM3423 is $1.75 in 1,000-unit quantities.

As for space-critical infotainment backlighting, National's PowerWise LM3431 3-channel, constant-current LED driver includes an integrated boost controller and features dimming frequencies up to 25kHz with a contrast ratio of 100:1. The LM3431 in a 28-pin TSSOP package is priced at $2.05 each in 1,000-unit quantities.

Thermal performance
Under-the-hood automotive electronic control systems demand the highest thermal performance from electronic systems at temperatures beyond 150C.

National's new PowerWise LM95172Q digital temperature sensor monitors automotive system temperature up to 175C and delivers 1C accuracy between 130C and 160C. The device meets AEC-Q100 Grade 0 qualification requirements. The LM95172Q's pinpoint accuracy at high temperatures permits lower system guard bands. System engineers now can develop a reliable electronic control unit (ECU) that consistently runs at higher temperatures, allowing for optimal oil viscosity, smaller system form factor and lower weight. These elements enable increased fuel efficiency. Packaged in die form for mounting on hybrid circuit boards, the LM95172Q is priced at $1.25 each in 1,000-unit quantities.

For controlling fuel injection performance, National's new LMP8601Q 60V current sensing amp offers guaranteed temperature coefficients of 100 percent test (from -40C to 125C). Available now in an 8-pin SOIC narrow package, the LMP8601Q is priced at $1.96 each in 1,000-unit quantities.

A/V fusion
Infotainment systems continue to evolve with the convergence of multiple audio and video streams, camera imaging systems and navigation into a single sophisticated system that includes real-time road and driver alerts. Keeping audio and video crisp despite multiple sources and multiple streams presents unique challenges.

National's DS90UR124Q and DS90UR241Q serializer/deserializers (SerDes) and low-jitter crosspoint switches provide an efficient and cost-effective way to route and switch video content to single or multiple displays in the driver and passenger compartments. Combined with National's LM49350 and LM49370 Boomer audio amplifier subsystems, the DS90UR124Q and DS90UR241Q deliver audio and video over a single high-speed LVDS lane, thereby minimizing cables and weight while improving the ease of design and the ability to drive cables up to 10 meters. Available now in a 64-pin and 48-pin TQFP package respectively, the DS90UR124Q and DS90UR241Q are priced at $5.30 each in 1,000-unit quantities. They are AEC-Q100 Grade 2 qualified for operation between -40C and 105C.

Safety first
Safety combined with convenience is emerging as a top feature among automotive customers. Today, multiple systems work together to actively alert the driver of potential road hazards. National's new LM48100Q single-supply, mono bridge-tied load amplifier with I2C-compatible volume control amplifies warning and alert tones in these automobile driver warning systems. This Boomer audio power amplifier is AEC-Q100 Grade 2 qualified and includes a comprehensive output fault detection system that senses the load conditions, protecting the device during short circuit events, as well as detecting open circuit conditions. Operating from a single 5V supply, the LM48100Q delivers 1.3W of continuous output power to an 8? load with less than 1 percent total harmonic distortion plus noise (THD+N). Available now in a 14-pin TSSOP package, the LM48100Q audio power amplifier is priced at $1.50 each in 1,000-unit quantities.

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