Efficiency up to 94%, no need for heatsinks Features Pin compatible with LM78XX linears Low profile (L/W/H=11.5 x 7.55 x 10.2mm) DC/DC Converter Wide input range Switching Short circuit protection, thermal shutdown Low ripple and noise Regulator R-78-1.0 IEC/EN60950-1 certified Description 1.0 Amp The R-78xx-1.0 series switching regulators are ideally suited to replace 1 Amp 78xx linear regulators SIP3 and are pin compatible. Efficiencies of up to 94% mean that very little energy is wasted as heat so there is no need for any heat sinks with their additional space and mounting costs. Single Output Selection Guide Part Input Output Output Efficiency Number Voltage Range Voltage Current min Vin max. Vin VDC VDC A % % R-781.8-1.0 4.75 - 18 1.8 1.0 82 76 R-782.5-1.0 4.75 - 18 2.5 1.0 87 81 R-783.3-1.0 4.75 - 18 3.3 1.0 90 84 R-785.0-1.0 6.5 - 18 5.0 1.0 94 89 Model Numbering R-78 -1.0 Output Voltage Output Current IEC/EN60950-1 certified EN55032 compliant Specifications (measured Ta= 25C, 10% minimum load, unless otherwise stated) BASIC CHARACTERISTICS Parameter Condition Min. Typ. Max. Quiescent Current Vin = min. to max. at 0% load 5mA 7mA Internal Power Dissipation 0.4W (1) Minimum Load 0% Internal Operating Frequency 280kHz 350kHz 430kHz Output Ripple and Noise measured at 20MHz BW 20mVp-p 30mVp-p Absolute Maximum 1 second start up, no external components 220F Capacitive Load <1 second start up + diode protection circuit 6800F Notes: Note1: Operation under no load will not harm the converter, but specifications may not be met A minimum load of 10mA is recommended continued on next page www.recom-power.com REV.: 4/2019 I-1R-78xx-1.0 DC/DC Converter Series Specifications (measured Ta= 25C, 10% minimum load, unless otherwise stated) Ripple vs. Vin (full load) Efficiency vs. Vin (full load) 100 50 5Vout 3.3Vout 90 45 2.5Vout 80 40 1.8Vout 70 35 60 30 50 25 40 20 30 15 5Vout 3.3Vout 20 10 2.5Vout 10 1.8Vout 5 0 0 5 7 9 11 13 15 17 18 5 7 9 11 13 15 17 18 Input Voltage VDC Input Voltage VDC Efficiency vs. Load (max. Vin) Ripple vs. Load (max. Vin) 100 50 5Vout 3.3Vout 90 45 2.5Vout 80 40 1.8Vout 70 35 60 30 50 25 40 20 30 15 5Vout 3.3Vout 20 10 2.5Vout 10 5 1.8Vout 0 0 0 10 20 30 40 50 60 70 80 90 100 0 10 20 30 40 50 60 70 80 90 100 Output Load % Output Load % Efficiency vs. Load (min. Vin) Ripple vs. Load (min. Vin) 50 100 5Vout 3.3Vout 45 90 2.5Vout 40 1.8Vout 80 35 70 30 60 25 50 40 20 15 30 5Vout 3.3Vout 20 10 2.5Vout 5 10 1.8Vout 0 0 0 10 20 30 40 50 60 70 80 90 100 0 10 20 30 40 50 60 70 80 90 100 Output Load % Output Load % www.recom-power.com REV.: 4/2019 I-2 Efficiency % Efficiency % Efficiency % Ripple mV Ripple mV Ripple mV