Smartphone and tablet charger applications

Product portfolio for smartphone and tablet charger

Package options for smartphone and tablet charger

Chargers for smartphones and tablets as well as other mobile applications demand for a growing output power at same or smaller form factors, leading to increasing power density, and stringent requirements on thermal management, EMI emissions and overall system cost. For example, many OEMs request a device temperature less than 90°C with an open case and close case temperature less than 50°C.

Infineon recommends its series of 700V CoolMOS™ CE superjunction MOSFETs for this application, which are used by leading charger OEMs and design houses in their charger applications. Compared to planar MOSFETs the 700V CoolMOS™ CE offers reduced switching and thus higher efficiency while passing EMI standards and ringing requirements. Several reference designs have been developed by Infineon to help customers to simplify charger design and thus providing fast time-to-market (see reference design selection table at end of section).

Value proposition of 700V CoolMOS™ CE

• High efficiency, meeting application requirements
• More than enough safety margin in thermals, for 10W-25W chargers
• Good EMI performance - meets the EMI EN55022B standard without extra design-in effort
• Easy to use product due to good controllability via gate resistor
• Large breakdown voltage of nominal 700V (and additional guard band typical) for safety on voltage spikes

Infineon CoolMOS™ CE offers higher efficiency and better thermals than planar MOSFETs: when replacing a 1.6Ω planar MOSFET with an Infineon 2.0Ω CoolMOS™ CE in a 15W QC 2.0 charger we measured ≥0.2 percent efficiency improvement. At the same time, the MOSFET temperature was 7°C cooler, showing a clear benefit of using CoolMOS™ CE for charger applications.

Also for 24W quick chargers CoolMOS™ CE offers excellent efficiency, e.g., with the IPAW70R950CE. Besides efficiency it passes other spec requirements. The board is orderable through Infineon’s sample center.

The figure shows the CoolMOS™ CE EMI performance in 10W and 15W charger applications. Maximum EMI limits are indicated in the figure. CoolMOS™ CE could meet the EMI requirement thus offering design in flexibilities.

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Larger package with better thermal performance than IPAK short lead for more than 20W charger application. The package carries higher cost yet saves efforts in heat sinking.

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700V CoolMOS™ CE in I²PAK

Standard packages used in chargers today with excellent reliability and wide usage in the industry.

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500V/600V/650V/700V/800V CoolMOS™ CE in IPAK Short Lead and DPAK

Innovative package for charger applications providing a defined standoff between package and PBC.

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700V CoolMOS™CE in IPAK Short Lead with ISO Standoff

Very flat package (0.8mm height) package targeting slim charger solutions. Bottom side cooling is applied by many customers, but heat sinking through the top side is also possible.

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CoolMOS™ in ThinPAK 5x6

Highly cost optimized surface-mount package with small footprint. The SOT-223 shows slightly worse thermal performance than DPAK, however this can be compensated with little effort by offering a slightly larger copper area (~15mm²) around the package for heatsinking on the PCB.

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500V/600V/650V/700V CoolMOS™ CE in SOT-223

The TO-220 FullPAK Wide Creepage increases the creepage distance to 4.25mm compared to 2.54mm for a standard TO-220 package. It fully meets requirements of the EN60664-1 standard that requires at least 3.6mm for open frame electrical power supplies which are often found in LED TV, PC power or industrial power supplies.

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600V CoolMOS™ CE in TO-220 FullPAK Wide Creepage