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DC/DC converters cut part count, BOM cost

Posted: 27 Jan 2012 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converter? synchronous? WLAN?

ZMD AG (ZMDI) has released a family of 1, 2, and 3A current-mode synchronous buck DC/DC converter ICs that claim to deliver ease of design, quick product development and low BOM costs. The ICs are designed to operate from -40C to 125C.

The 1MHz ZMDI ZSPM401x product line includes three families and 18 products: the ZSPM4011 1A family, the ZSPM4012 2A family and the ZSPM4013 3A family. The ICs require only four external devicesthree capacitors and one inductor. Each family comes in fixed-output voltage options of 1.5, 1.8, 2.5, 3.3 and 5V to reduce external part counts, while allowing for quick part selection and easy design, noted ZMDI. An input voltage range of 6-24V (3A option is 6-20V) lets designers target more applications with one basic 'cookie-cutter' design technique, said the firm.


The buck converters come in 1.5, 1.8, 2.5, 3.3 and 5V options.

Each family offers a variable output voltage option of 0.9-5V for maximum part flexibility. At 5Vin and 1.8Vout, the parts offer 90 percent efficiency, said the company. At 6Vin and 3.3Vout, efficiency increases to 93 percent. The efficiency of the design eliminates the need for any external thermal protection. Additional features are input supply undervoltage lockout, soft-start for controlled startup with no overshoot, and full protection for overcurrent, overtemperature, and Vout overvoltage, added ZMDI.

Synchronous switching at 1MHz (10 percent) and internal compensation minimizes the number and size of external parts, minimizing board real estate. A typical, low standby mode of 5?A maximizes energy efficiency while reducing the application's power budget, indicated the company.

Target applications for these devices include notebooks, tablets, smartphones, portable GPS systems, printers, cable modems, VOIP phones and wireless access points based on the IEEE802.11 WLAN standard.

The ZSPM4011, ZSPM4012 and ZSPM4013 ICs come in 3 x 3mm 16-pin PQFN package.

Available in sample quantities now, the families are priced at $1.81 for 1Ku for the ZSPM4011, $1.84 for 1Ku for the ZSPM4012 and $1.89 for 1Ku for the ZSPM4013. Evaluation kits consisting of an evaluation board and user manual are available from ZMDI, along with white papers and application notes.

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