Features * * * * * * Switching Regulator Efficiency up to 94%, no need for heatsinks High reflow temperature SMD package Adjustable output voltage buck converter Short circuit protection, thermal shutdown Remote on/off control Very low shutdown current Description The R-78AAxx-1.0SMD series are adjustable output non-isolated buck converters that meet the requirements for RoHS 10/10 as well as the reflow soldering temperatures associated with vapor phase soldering, making these high efficiency switching regulators ideally suited to modern pick-and-place mass production. The efficiency of up to 97% means that very little energy is wasted as heat. The additional features of remote on/off control, continuous short circuit protection and adjustable output voltages will find many uses in the battery-powered, industrial, medical and automotive markets. DC/DC Converter R-78AA-1.0 1.0 Amp SMD Single Output Selection Guide Part Number Input Voltage Range [VDC] R-78AA1.5-1.0SMD 4.75 - 18 R-78AA1.8-1.0SMD 4.75 - 18 R-78AA2.5-1.0SMD 4.75 - 18 R-78AA3.3-1.0SMD 4.75 - 18 R-78AA5.0-1.0SMD 6.5 - 18 Output Voltage [VDC] 1.5 1.8 2.5 3.3 5.0 Vout Adjust Range [VDC] fixed 1.5 - 3.0 1.5 - 3.0 3.0 - 5.5 3.0 - 5.5 OutputEfficiency Current @ min Vin @ max. Vin [mA] [%][%] 1.0 77 73 1.0 82 76 1.0 87 81 1.0 90 84 1.0 94 89 Notes: Note1: Input voltage ranges valid for nominal output voltages Vin must be higher than Vout including adjust range and dropout voltage Model Numbering EN60950-1 certified IEC60950-1 certified R-78AA__-1.0SMD-_ nom. Output Voltage Output Current Packaging (2) Package Notes: Note2: add suffix -R for tape & reel packaging Ordering Examples: R-78AA5.0-1.0SMD-R = 5.0VDC Output Volage, 1.0A, SMD, tape and reel packaging R-78AA2.5-1.0SMD = 2.5VDC Output Volage, 1.0A, SMD, tube www.recom-power.com REV.: 5/2019 I-1 R-78AA-1.0 DC/DC Converter Series Specifications (measured @ Ta= 25C, 10% minimum load, unless otherwise stated) BASIC CHARACTERISTICS Parameter Condition Quiescent Current Min. Vin= min. to max. Typ. Max. 5mA 7mA 0.4W Internal Power Dissipation see calculation Output Voltage Adjustability 0% Minimum Load (2) Start-up time ON/OFF CTRL ON/OFF CTRL DC-DC ON DC-DC OFF Input Current of CTRL Pin DC-DC OFF 50ms Open or 2.8VDC<Vr<5VDC GND or 0VDC<Vr<0.8VDC 1.8A 20A 35A 2.6VDC 2.8VDC Standby Current 2.4VDC CTRL Thereshold Voltage 250mV CTRL Voltage Hysterese Internal Operating Frequency 335kHz Output Ripple and Noise 20MHz BW Maximum Capacitive Load 385kHz 435kHz 20mVp-p 30mVp-p with normal start-up time, no external components 470F with <1 second start-up time + diode protection circuit 6800F Notes: Note3: Operation under no load will not harm the converter, but specifications may not be met. A minimum load of 10mA is recommended Output Voltage Adjustability Adjustment Resistor Values R1 10K 22K 16.9K 30.9K 1.8V 2.5V 3.3V 5.0V Trim down R2 21K 21K 10K 10K Rdown = Trim up Rup = R3 5.6K 5.6K 5.6K 10K +VIN Vref(V) 1.23 1.23 1.23 1.23 +VOUT Controlled IC R2 R2(R1 + R3) x (Vref - Vo) + Vref x R1R3 GND Vref R2R3 (Vref - Vo) + Vref R1 (R2 + R3) R2 (Vo - Vref) - Vref R1 90 45 80 40 Ripple [mV] Efficiency [%] Ripple vs. Vin (full load) 50 70 60 50 10 0 4.75 7 9 35 30 25 15 10 5 11 13 Input Voltage [VDC] www.recom-power.com 5Vout 3.3Vout 2.5Vout 1.8Vout 1.5Vout 20 5Vout 3.3Vout 2.5Vout 1.8Vout 1.5Vout 20 Rup GND 100 30 Vadj R3 R2Vo - Vref (R1 + R2) Efficiency vs. Vin (full load) 40 Rdown R1 15 17 18 0 4.75 continued on next page REV.: 5/2019 7 9 11 13 15 17 18 Input Voltage [VDC] I-2 R-78AA-1.0 DC/DC Converter Series Specifications (measured @ Ta= 25C, 10% minimum load, unless otherwise stated) Ripple vs. Load (max. Vin) 100 50 90 45 80 40 70 35 Ripple [mV] Efficiency [%] Efficiency vs. Load (max. Vin) 60 50 30 25 20 40 5Vout 3.3Vout 2.5Vout 1.8Vout 1.5Vout 30 20 10 0 5Vout 3.3Vout 2.5Vout 1.8Vout 1.5Vout 0 10 20 30 15 10 5 40 50 60 70 80 90 0 100 0 10 20 30 Efficiency vs. Load (min. Vin) 60 70 80 90 100 80 90 100 Ripple vs. Load (min. Vin) 100 50 90 45 80 40 Ripple [mV] Efficiency [%] 50 Output Load [%] Output Load [%] 70 60 50 40 5Vout 3.3Vout 2.5Vout 1.8Vout 1.5Vout 35 30 25 20 30 5Vout 3.3Vout 2.5Vout 1.8Vout 1.5Vout 20 10 0 40 0 10 20 30 15 10 5 40 50 60 70 80 90 0 100 0 10 20 Output Load [%] 30 40 50 60 70 Output Load [%] REGULATIONS Parameter Condition Value Output Accuracy full load Line Regulation low line to high line, full load 0.2% typ. / 0.4% max. Load Regulation 10% to 100% load 0.7% typ. / 1.0% max. Transient Response www.recom-power.com 25mA/s 100% <-> 50% load REV.: 5/2019 2.0% typ. / 3.0% max. 85mV typ. / 100mV max. I-3 R-78AA-1.0 DC/DC Converter Series Specifications (measured @ Ta= 25C, 10% minimum load, unless otherwise stated) PROTECTIONS Parameter Condition Value Short Circuit Protection (SCP) +Vin Short Circuit Input Current nom. Vin= 12VDC CTRL Optional Protection 1: The diode can either be fitted across the device if the source is low impedance or fitted in series with the output (recommended). R-78AAxx +Vout continuous, automatic recovery -1.0SMD 120mA max. +Vout CTRL GND Optional Diode Protection Circuit Add a blocking diode to Vout if current can flow backwards into the output, as this can damage the converter when it is powered down. +Vin GND Protection 2: Optional +Vin +Vin +Vin R-78AAxx -1.0SMD +Vout +Vout GND GND +Vin +Vin R-78AAxx -1.0SMD CTRL GND +Vout R-78AAxx -1.0SMD CTRL GND CTRL GND CTRL +Vin CTRL GND GND +Vout +Vout Vadj Trim output voltage up 1 diode drop GND +Vout Vadj Trim output voltage up 1 diode drop CTRL GND GND ENVIRONMENTAL Parameter Condition Operating Temperature Range Value with derating (see graph) -40C to +85C Maximum Case Temperature +100C Temperature Coefficient 0.015%/C Thermal Impedance 0.1m/s, horizontal 70C/W Operating Altitude 2000m Operating Humidity non-condensing 5% - 95% RH max. Pollution Degree PD2 MTBF according to MIL-HDBK-217F, G.B. Derating Graph +25C + 71C 13338 - 21070 x 103 hours 3880 - 6769 x 103 hours 100 90 Output Load [%] 80 70 60 50 40 30 20 10 0 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 85 Ambient Temperature [C] www.recom-power.com REV.: 5/2019 I-4 R-78AA-1.0 DC/DC Converter Series Specifications (measured @ Ta= 25C, 10% minimum load, unless otherwise stated) SAFETY AND CERTIFICATIONS Certificate Type (Safety) Report / File Number Information Technology Equipment, General Requirements for Safety Standard IEC60950-1:2005, 2nd Edition + AM 2:2013 EN60950-1:2006 + AM 2:2013 1603123 EAC RU-AT.49.09571 TP TC 004/2011 TP TC 004/2011 RoHS 2+ RoHS 2011/65/EU + AM2015/863 EMC Compliance Condition Electromagnetic compatibility of multimedia equipment Emission requirements Standard / Criterion with external filter ESD Electrostatic discharge immunity test EN55032, Class B Air 8kV; Contact 4kV EN61000-4-2 3V/m EN61000-4-3 Radiated, radio-frequency, electromagnetic field immunity test DIMENSION AND PHYSICAL CHARACTERISTICS Parameter Type Value Material case PCB non-conductive black plastic, (UL94 V-2) FR4, (UL94 V-1) Dimension (LxWxH) 15.3 x 9.6 x 8.8mm Weight 1.7g typ. Dimension Drawing (mm) 9.6 15.3 Pinning information Pin # 1,2 3,7,8,9 4,5 6 10 9.4 8.8 9.24 15.0 0.500.05 2.54 x 4 Recommended Footprint Details 2.54 www.recom-power.com 1.30 13.00 Top View 1 2 3 4 5 1.80 Bottom View 10 9 8 7 6 Tolerance: xx.x= 0.5mm xx.xx= 0.25mm 10 9 8 7 6 12.35 1 2 3 4 5 Single +Vin GND +Vout Vadj CTRL REV.: 5/2019 1.20 I-5 R-78AA-1.0 DC/DC Converter Series Specifications (measured @ Ta= 25C, 10% minimum load, unless otherwise stated) PACKAGING INFORMATION Parameter Packaging Dimension (LxWxH) Packaging Quantity Type tube tape and reel (carton) tube tape and reel Tape Width Value 530.0 x 17.0 x 13.0mm 355.0 x 342.0 x 36.0mm 33pcs 250pcs 24mm Storage Temperature Range -55C to +125C Storage Humidity 95% RH max. The product information and specifications may be subject to changes even without prior written notice.The product has been designed for various applications; its suitability lies in the responsibility of each customer. The products are not authorized for use in safety-critical applications without RECOM's explicit written consent. A safety-critical application is an application where a failure may reasonably be expected to endanger or cause loss of life, inflict bodily harm or damage property. The applicant shall indemnify and hold harmless RECOM, its affiliated companies and its representatives against any damage claims in connection with the unauthorized use of RECOM products in such safety-critical applications. www.recom-power.com REV.: 5/2019 I-6