ZMDI (Dresden, Germany) has introduced a family of 1, 2, and 3A current-mode synchronous buck DC/DC converter integrated circuits (ICs) tailored for ease of design, quick product development, and low bill of materials (BOM) costs. The 1MHz ZMDI ZSPM401x product line comprises three families and 18 products: the ZSPM4011 1A family, the ZSPM4012 2A family, and the ZSPM4013 3A family. The ICs require only four external devices - three capacitors and one inductor.

Each family comes in fixed-output voltage options of 1.5, 1.8, 2.5, 3.3, and 5 volts to reduce external part counts, while allowing for quick part selection and easy design. An input voltage range of 6 V — 24 V (3A option is 6 V to 20 V) lets designers target more applications with one basic design technique.

Each family also offers a variable output voltage option of 0.9 V to 5 V. At 5-V in and 1.8-V out, the parts offer 90% efficiency. At 6-V in and 3.3-V out, efficiency increases to 93%. The high efficiency of the design eliminates the need for any external thermal protection. Additional features are input supply under-voltage lockout, soft-start for controlled startup with no overshoot, and full protection for over-current, over-temperature, and Vout over-voltage.


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