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Automotive smart power switches replace relays, handle higher currents

Automotive smart power switches replace relays, handle higher currents

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By Graham Prophet



Using its SMART7 manufacturing flow for automotive applications such as body control modules or power distribution centres, Infineon has designed power ICs to drive, diagnose and protect loads in applications such as heating, power distribution, air-conditioning, exterior and interior lighting, seat and mirror adjustment. They also provide a cost-effective and robust replacement for electromechanical relays and fuses. SMART7 is based on thin-wafer technology that reduces power losses and chip sizes.

 

The PROFET+2 family was developed for automotive 12V lighting load applications and capacitive loads. These comprise, for example, halogen bulbs in external lighting control, interior lighting and dimming, as well as LED lighting. PROFET+2 devices provide diagnostics and protection features. They maintain pin-out compatibility with their predecessor family PROFET+ for zero-cost migration. There is no ECU layout change needed, if single-channel devices are replaced by dual-channel variants and vice versa. Compared to their predecessor family, the PROFET+2 devices are up to 40% smaller in package size and improve energy efficiency with 50% lower current consumption. The lowest ohmic PROFET+2 device is the 8 mΩ dual-channel switch BTS7008-2EPA with protection functions and diagnosis.

 

The High Current PROFETs extend the flexible family approach of PROFET+2 to on-state resistances RDS(ON) from 8 mΩ down to 2 mΩ in the same TSDSO-14 package. A High Current PROFET in a TSDSO-14 package with pin pitch of 0.65 mm offers today’s lowest-available RDS(ON) in a monolithic switch. Compared to established smart power switches in the DPAK package, the footprint of the TSDSO-14 is 50% smaller. Compared to D²PAK, it is 80% smaller. The family enables very efficient driving of high current loads and reduces power losses in control modules, up to 60%. With its optimized feature set for 12V high current loads, including diagnosis and protection, the family addresses a range of heating and power distribution applications such as glow plug controller, PTC (Positive Temperature Coefficient) heater, starter relay, horn, trailer node, and auxiliary power outlet.

 

Both families, PROFET+2 and High Current PROFET, are pin-compatible and share the main feature set. Their on-state resistance RDS(ON) scales from 2 mΩ to 200 mΩ. Their load current sense accuracy (k ILIS) below 5% at a nominal current is benchmark in the market. Their protection features comprise current tripping, over temperature, overvoltage, load dump and reverse battery capability ReverSave. Infineon says it is first in the market to implement reverse battery capability in a monolithic chip. A further benchmark feature is a cranking voltage capability able to work down to 3.1 V.

 

The PROFET+2 device BTS7008-2EPA with 2 x 8 mΩ is released for mass production. Engineering samples of further switches in both families are available. Their mass production is planned to start as of Q4 2017 and later. All high-side switches will be qualified in accordance with AEC Q100.

 

Infineon; www.infineon.com/switches and at www.infineon.com/profet+2

 

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