CUI Inc. has added two isolated DC-DC converter families for industrial, test and measurement, and telecommunication applications. The rugged and compact PQMC3-S and PQM3-M families increase total efficiency across the entire load curve and give improved performance at light and no loads. The converters are ideal for battery-powered applications where power draw under these conditions are a concern.

Rated at 3 W, the PQMC3-S series is available with input ranges of 4.5 - 9, 9 - 18, 18 - 36, or 36 - 75 VDC while the PQM3-M series offers input ranges of 9 - 18, 18 - 36, or 36 - 75 VDC. Both families come equipped with an operating temperature range of -40°C to + 85°C at 100% load, allowing the DC-DC converters to work reliably in harsh environments. The PQMC3-S series is housed in a compact 8-pin SIP package measuring 0.86 x 0.37 x 0.47 in. (22 x 9.5 x 12 mm) and the PQM3-M series is housed in a 16-pin SMT package measuring 0.94 x 0.54 x 0.30 in. (23.86 x 13.70 x 7.50 mm).

Both families are available in single-output voltages of 5, 12, or 15 VDC while the SIP version PQMC3-S is also available in dual-output voltages of ±5, ±12, or ±15 VDC. Outputs are fully regulated to within ±0.2% (typ.) for all line and load conditions. Input to output isolation of 1,500 VDC is provided across the range of models. Protections include continuous short-circuit and over-current. The DC-DC converters meet CISPR22/EN55022 class B standards with limited external components.

• 3 W isolated output
• Single/dual regulated output
• Continuous short-circuit, over-current protections
• Remote on/off control
• -40°C to +105°C temperature range
• Low no-load power consumption
• Efficiency up to 84%