Features Switching Regulator RoHS / conform (% lead free) High reflow temperature SMD package Adjustable output voltage Short circuit protection, thermal shutdown Remote ON/OFF control very low shutdown current DC/DC Converter R-78AA-1. Description The R-78AAxx-1.SMD series are manufactured without lead and meet the requirements for RoHS / as well as the increased reflow soldering temperatures associated with vapor phase soldering, making these high efficiency switching regulators ideally suited to modern pick-andplace mass production. The efficiency of up to 94% means that very little energy is wasted as heat. The additional features of remote on/off control and adjustable output voltages will find many uses in the battery-powered, industrial, medical and automotive markets. 1. Amp SMD Single Output Selection Guide Part Input Output Vout Output Efficiency Number Voltage Range Voltage Adjust Range Current @ min Vin @ max. Vin [VDC] [VDC] [VDC] [ma] [%] [%] R-78AA1.5-1.SMD 4.75-18 1.5 fixed 1. 77 73 R-78AA1.8-1.SMD 4.75-18 1.8 1.5-3. 1. 82 76 R-78AA2.5-1.SMD 4.75-18 2.5 1.5-3. 1. 87 81 R-78AA3.3-1.SMD 4.75-18 3.3 3. - 5.5 1. 9 84 R-78AA5.-1.SMD 6.5-18 5. 3. - 5.5 1. 94 89 Model Numbering nom. Output Voltage R-78AA -1.SMD-_ Output Current Packaging (1) Package EN69-1 certified IEC69-1 certified Notes: Note1: add suffix -R for tape & reel packaging Ordering Examples: R-78AA5.-1.SMD-R = 5.VDC Output Volage, 1.A, SMD, tape and reel packaging R-78AA2.5-1.SMD = 2.5VDC Output Volage, 1.A, SMD, tube www.recom-power.com REV.: 3/218 I-1
Specifications (measured @ Ta= 25 C, % minimum load, unless otherwise stated) R-78AA-1. BASIC CHARACTERISTICS Parameter Condition Min. Typ. Max. Quiescent Current Vin= min. to max. 5mA 7mA Internal Power Dissipation.4W Trimming Minimum Load (2) % Start-up time ON/OFF ms ON/OFF DC-DC ON DC-DC OFF Input Current of Pin DC-DC OFF 1.8µA see calculation Open or 2.8VDC<Vr<5VDC or VDC<Vr<.8VDC Standby Current 2µA 35µA thereshold voltage 2.4VDC 2.6VDC 2.8VDC voltage hysterese Internal Operating Frequency 335kHz 385kHz 435kHz Output Ripple and Noise 2MHz BW 2mVp-p 3mVp-p Maximum Capacitive Load with normal start-up time, no external components 47µF Trimming Adjustment Resistor Values R1 R2 R3 Vref(V) 1.8V KΩ 21KΩ 5.6KΩ 1.23 2.5V 22KΩ 21KΩ 5.6KΩ 1.23 3.3V 16.9KΩ KΩ 5.6KΩ 1.23 5.V 3.9KΩ KΩ KΩ 1.23 2mV with <1 second start-up time + diode protection circuit 68µF Notes: Note2: Operation under no load will not harm the converter, but specifications may not be met. A minimum load of ma is recommended Controlled IC R1 R2 R3 V adj R down R up Trim down Rdown = R2(R1 + R2) x (Vref - V) + Vref x R1R3 R2V - Vref (R1 + R2) Vref Trim up Rup = R2R3 (Vref - V) + Vref R1 (R2 + R3) R2 (V - Vref) - Vref R1 Efficiency [%] 9 8 7 6 3 2 Efficiency vs. Vin (full load) 4.75 7 9 11 13 15 17 18 Input Voltage [VDC] continued on next page 4.75 7 9 11 13 15 17 18 www.recom-power.com REV.: 3/218 I-2 Ripple [mv] 45 35 3 25 2 15 5 Ripple vs. Vin (full load) Input Voltage [VDC]
Specifications (measured @ Ta= 25 C, % minimum load, unless otherwise stated) R-78AA-1. Efficiency vs. Load (max. Vin) Ripple vs. Load (max. Vin) Efficiency [%] 9 8 7 6 3 2 2 3 6 7 8 9 Ripple [mv] 45 35 3 25 2 15 5 2 3 6 7 8 9 Efficiency vs. Load (min. Vin) Ripple vs. Load (min. Vin) Efficiency [%] 9 8 7 6 Ripple [mv] 45 35 3 25 2 3 2 2 3 6 7 8 9 15 5 2 3 6 7 8 9 REGULATIONS Parameter Condition Value Output Accuracy full load ±2.% typ. / ±3.% max. Line Regulation low line to high line, full load ±.2% typ. / ±.4% max. Load Regulation % to % load ±.7% typ. / ±1.% max. Transient Response 25mA/µs % <-> % load ±85mV typ. / ±mv max. www.recom-power.com REV.: 3/218 I-3
Specifications (measured @ Ta= 25 C, % minimum load, unless otherwise stated) R-78AA-1. PROTECTIONS Parameter Condition Value Short Circuit Protection (SCP) continuous, automatic recovery Short Circuit Input Current nom. Vin= 12VDC 12mA max. Optional Diode Protection Circuit Optional Protection 1: Optional Protection 2: 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. 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 -1.SMD R-78AAxx -1.SMD Trim output voltage up 1 diode drop ENVIRONMENTAL Parameter Condition Value Operating Temperature Range with derating (see graph) - C to +85 C Maximum Case Temperature Temperature Coefficient + C ±.15%/ C Thermal Impedance.1m/s, horizontal 7 C/W Operating Altitude Operating Humidity non-condensing 5% - 95% RH max. Pollution Degree MTBF Derating Graph according to MIL-HDBK-217F, G.B. +25 C + 71 C 2m PD2 13338-27 x 3 hours 388-6769 x 3 hours 9 8 7 6 3 2 - -3-2 - 2 3 6 7 8 9 Ambient Temperature [ C] 85 www.recom-power.com REV.: 3/218 I-4
Specifications (measured @ Ta= 25 C, % minimum load, unless otherwise stated) R-78AA-1. SAFETY AND CERTIFICATIONS Certificate Type (Safety) Report / File Number Standard Information Technology Equipment, General Requirements for Safety 163123 IEC69-1:25, 2nd Edition + AM 2:213 EN69-1:26 + AM 2:213 EAC RU-AT.49.9571 TP TC 4/211 TP TC 4/211 RoHs 2+ RoHS 211/65/EU + AM215/863 EMC Compliance Condition Standard / Criterion Electromagnetic compatibility of multimedia equipment - Emission requirements with external filter EN532, Class B ESD Electrostatic discharge immunity test Air ±8kV; Contact ±4kV EN6-4-2 Radiated, radio-frequency, electromagnetic field immunity test 3V/m EN6-4-3 DIMENSION AND PHYSICAL CHARACTERISTICS Parameter Type Value Material Package Dimension (LxWxH) Package Weight Dimension Drawing (mm) 15.3 case PCB non-conductive black plastic, (UL94 V-2) FR4, (UL94 V-1) 15.3 x 9.6 x 8.8mm 1.7g typ. 9.6 15.. ±.5 2.54 x 4 8.8 9.4 9.24 Recommended Footprint Details Pinning information Pin # Single 1,2 +Vin 3,7,8,9 4,5 +Vout 6 V adj Tolerance: xx.x=.5mm xx.xx= ±.25mm 1 2 3 4 5 Bottom View 9 8 7 6 12.35 9 8 7 6 Top View 1 2 3 4 5 13. 2.54 1.3 1.2 1.8 www.recom-power.com REV.: 3/218 I-5
Specifications (measured @ Ta= 25 C, % minimum load, unless otherwise stated) R-78AA-1. INSTALLATION AND APPLICATION Standard Application Circuit +V 1,2 4,5 IN R-78AAxx-1.SMD 3,7,8,9 6 R UP R DOWN 3.3V/5V Selectable 1A Power Supply = 3.3V R-78AA3.3-1.SMD or 5.V @ 1A 6.8kΩ 3.3V/5V Select (TTL) 4.7kΩ Driving a High Capactive Load R-78AAxx -1.SMD 68µF PACKAGING INFORMATION Parameter Type Value Packaging Dimension (LxWxH) Packaging Quantity Tape Width Storage Temperature Range Storage Humidity tube tape and reel (carton) tube tape and reel 53. x 17. x 13.mm 355. x 342. x 36.mm 33pcs 2pcs 24mm -55 C to +125 C 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.: 3/218 I-6