High-efficiency non-isolated SMT switching regulator — up to 95 % efficiency in ultra-thin and open-frame variants
500 mA Output Current, 95 % Efficiency, 4.75–36 V Input Range, 2 M h MTBF, SMT Package
The new LMTO78 series is a non-isolated, high-efficiency DC/DC switching regulator in an SMT package,
developed for modern, energy-efficient electronic assemblies where efficiency, reliability, and compactness are equally critical. The series is available in two mechanical variants: the LMTO78_0.5R in an ultra-thin SMT housing of just 3.5 mm height (12.50 x 13.50 x 3.50 mm) and the LMTO78_0.5R1 in an open-frame design (12 x 12 x 4.5 mm). Both variants deliver 500 mA output current and are available across a broad output-voltage range from 3.3 to 15 VDC
With an efficiency of up to 95 % at full load, the LMTO78 series minimises power dissipation and operates
entirely without external heatsinks — a decisive advantage for densely populated PCBs and compact
enclosures. The no-load input current is as low as 0.2 mA, further reducing energy consumption in stand-by. Depending on the output version, the input voltage range extends from 4.75 to 36 VDC, reliably covering standard 24 V industrial buses with wide voltage-tolerance bands.
Engineered for outstanding reliability, the LMTO78 series achieves an impressive MTBF of 2,000,000 hours
(MIL-HDBK-217F @ 25 °C) and operates stably across a temperature range of -40 °C to +85 °C (with derating from 71 °C). The integrated continuous short-circuit protection with automatic recovery safeguards the system even under fault conditions. The LMTO78_0.5R additionally features a remote on/off input (Ctrl) and meets MSL Level 1 for unlimited floor life under standard conditions.
Both variants comply with CISPR32/EN 55032 Class B (using the recommended external circuit) and meet the relevant immunity requirements, including ESD up to ±4 kV (contact) and surge up to ±1 kV. With a switching frequency of 500 kHz (LMTO78_0.5R) and 1.2 MHz (LMTO78_0.5R1), the series can be flexibly tailored to different filter-design and component-size requirements. The LMTO78 series is fully RoHS-compliant, underlining GAPTEC’s commitment to environmentally friendly and high-quality power-supply solutions
Typical fields of application include distributed power-supply systems, industrial automation, measurement and test equipment, IoT and communication electronics, and any design that demands high efficiency in a confined space.
GAPTEC Electronic is a leading supplier of innovative power-supply solutions, serving the growing demands of engineers and industry worldwide. Driven by a commitment to excellence and innovation, GAPTEC Electronic supports developers with state-of-the-art technologies to bring their projects to life.
GAPTEC Electronic guarantees the shortest possible lead times. Product warranty is three years. For further information, please contact GAPTEC Electronic directly.