Efficiency up to 97%, no heatsinks required Pin compatible with LM78XX linears Features Low profile (L/W/H=11.5 x 8.5 x 17.5mm) DC/DC Converter Wide input range Short circuit protection, thermal shutdown Switching Low ripple and noise L version with 90 pins Regulator R-78B-1.0(L) Positive to negative converter Description 1.0 Amp The R-78Bxx-1.0 series high efficiency switching regulators are ideally suited to replace 78xx SIP3 linear regulators and are pin compatible. The efficiency of up to 97% means that very little energy is wasted as heat so there is no need for any heat sinks with their additional space and mounting costs. The L-Version with 90 pins allows direct replacement for laid-flat regulators where component height Single Output is at a premium. Low ripple and noise figures and a short circuit input current of typically only 10mA round off the specifications of this versatile converter series. Selection Guide Part Input Output Output Efficiency Number Voltage Range Voltage Current min Vin max. Vin VDC VDC A % % (1) R-78B1.5-1.0 4.75 - 26 1.5 1.0 77 71 (1) R-78B1.8-1.0 4.75 - 26 1.8 1.0 80 74 (1) R-78B2.5-1.0 4.75 - 32 2.5 1.0 85 78 (1) R-78B3.3-1.0 4.75 - 32 3.3 1.0 89 83 (1) R-78B5.0-1.0 6.5 - 32 5.0 1.0 93 88 (1) R-78B6.5-1.0 9.0 - 32 6.5 1.0 94 90 (1) R-78B9.0-1.0 12 - 32 9.0 1.0 95 93 (1) R-78B12-1.0 16 - 32 12 1.0 96 95 (1) R-78B15-1.0 20 - 32 15 1.0 97 96 Model Numbering R-78B -1.0(L) Output Voltage Pinning Output Current Notes: Note1: add suffix L for 90 bent pins, e.g. R-78B5.0-1.0L EN55032 compliant IEC/EN60950-1 certified Specifications (measured Ta= 25C, 10% minimum load, unless otherwise stated) BASIC CHARACTERISTICS Parameter Condition Min. Typ. Max. 1.5Vout , 1.8Vout 26VDC Absolute Maximum Input Voltage 2.5Vout to 15Vout 34VDC Quiescent Current nom. Vin= 24VDC 5mA 7mA Internal Power Dissipation Vout= 1.5VDC 0.65W Internal Operating Frequency nom. Vin= 24VDC 280kHz 330kHz 380kHz (2) Minimum Load 0% 1.5Vout to 6.5Vout 15mVp-p 20mVp-p (3) Output Ripple and Noise 20MHz BW 9Vout to 15Vout 25mVp-p 35mVp-p Ref. Back Ripple Current 150mA 200mAp-p Absolute Maximum 1 second start up, no external components 470F Capacitive Load <1 second start up + diode protection circuit 6800F Notes: Note2: Operation under no load will not harm the converter, but specifications may not be met A minimum load of 10mA is recommended Note3: Output Ripple and Noise is tested from 10% to 100% load continued on next page www.recom-power.com REV.: 4/2019 I-1R-78Bxx-1.0(L) DC/DC Converter Series Specifications (measured Ta= 25C, 10% minimum load, unless otherwise stated) Efficiency vs. Vin (full load) Ripple vs. Vin (full load) 50 100 15Vout 3.3Vout 12, 9Vout 2.5Vout 90 45 6.5Vout 1.8, 1.5Vout 40 5Vout 80 35 70 30 60 25 50 20 40 15 15Vout 3.3Vout 30 12Vout 2.5Vout 10 20 9Vout 1.8Vout 6.5Vout 1.5Vout 5 10 5Vout 0 0 4.75 9 13 17 21 25 29 32 4.75 9 13 17 21 25 29 32 Input Voltage VDC Input Voltage VDC Efficiency vs. Load (max. Vin) Ripple vs. Load (max. Vin) 100 50 15Vout 3.3Vout 12, 9Vout 2.5Vout 90 45 6.5Vout 1.8, 1.5Vout 5Vout 80 40 70 35 60 30 50 25 40 20 15Vout 3.3Vout 30 15 12Vout 2.5Vout 20 9Vout 1.8Vout 10 6.5Vout 1.5Vout 10 5 5Vout 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 % Ripple vs. Load (min. Vin) Efficiency vs. Load (min. Vin) 100 50 15, 12, 9Vout 6.5Vout 90 45 2.5, 3.3, 5Vout 80 40 1.5, 18Vout 70 35 60 30 50 25 40 20 30 15 15Vout 3.3Vout 20 10 12Vout 2.5Vout 9, 6.5Vout 1.8Vout 10 5 5Vout 1.5Vout 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