UNR Series www.murata-ps.com Single Output, Non-Isolated, 12V-to-5V 5 Amp, DC/DC Converters OBSOLETE PRODUCT Features ■ No external I/O filtering required ■ +10.8V to +13.6V input ■ +5V (±50mV), 5 Amp output ■ Synchronous-rectifier topology ■ 300kHz switching frequency ■ Low output noise, 60mVp-p ■ Quick transient response, 30µsec ■ High efficiency, 91% ■ –40 to +70°C operation with no derating ■ On/off control; Undervoltage shutdown ■ Output trim capability (3.3V to 6V) ■ 1" x 2" metal package; EMC compliant ■ IEC950/EN60950/UL1950 pending ■ Modifications and customs for OEM’s When you’re faced with upgrading your system’s +5V power supply because your new, high-speed, 5V electronics simply demand too much current, consider tapping into your +12V line with one of Murata Power Solutions’ new, low-cost, 12V-to-5V DC/DC converters. These non-isolated buck regulators deliver up to 5 Amps of clean (60mVp-p noise), rapidly responding (30µsec step response) 5V current. They are housed in standard 1" x 2" metal packages and require absolutely no external filtering to achieve specified performance. The UNR-5/5-D12 achieves its high power density (25W/in3) through circuit topology and packaging. Its 91% efficient, fixed-frequency (300kHz), synchronousrectifier design is packaged, with thermally conductive potting compound, in a heatradiating, black metal case. It achieves low cost and high reliability through its use of proven, fully automated, SMT-on-pcb assembly techniques. Consequently, every 1 Amp of 12V current gives you 2.2 Amps of additional 5V current at an incremental cost. The impressively efficient UNR-5/5-D12 delivers it full rated 25W output power over the –40 to +70°C ambient temperature range without heat sinking or forced-air cooling. Units derate to +100°C ambient. Devices are fully line (±0.25% max.) and load (±0.5% max.) regulated and feature user-optional remote on/off control and output-voltage trim capabilities (from 3.3 to 6 Volts). If you need more 5V current and you’ve already rejected the use of inefficient, step-down, linear regulators, take a look at one of Murata Power Solutions' "switchers." Their high efficiency and ease of use may surprise you. Safety agency approvals and full EMI/EMC characterization tests are currently in progress. Last time buy: 3 March 2014 Click here for more information. +V +VIN UT UTPUT RETURN INPUT RETURN +V UNDERV TA E SHUTD WN CURRENT IMITIN S.C. SHUTD WN PWM C NTR ER N/ C NTR TRIM UT 10-20k9 5-10 Turns UTPUT RETURN RE ERENCE ERR R AMP TRIM (3.3 to 6V) Figure 1. Simplified Schematic Typical topology is shown. For full details go to www.murata-ps.com/rohs www.murata-ps.com/support UNR25-50W.C01 Page 1 of 2 UNR Series Single Output, Non-Isolated, 12V-to-5V 5 Amp, DC/DC Converters Performance/Functional Specifications Typical @ TA = +25°C under nominal line voltage and full-load conditions, with no external I/O filtering, unless noted. ➀ Absolute Maximum Ratings Input Input Voltage Range 10.8-13.6 Volts (12V nominal) Input Voltage 15 Volts Input Current ➁ 40/2290mA Output Current Input Filter Type Capacitive Overvoltage Protection None Current limited. Devices can withstand a sustained output short circuit without damage. Reverse-Polarity Protection None Storage Temperature –40 to +105°C Start-Up Threshold ➂ 10.2V typical, 10.4V maximum Lead Temperature (soldering, 10 sec.) +300°C Undervoltage Shutdown ➂ 9.6V typical, 8.2V minimum On/Off Control (Pin 3) ➃ TTL high (or open) = on, low = off Output VOUT Accuracy (50% load) ±1% (±50mV) maximum Temperature Coefficient ±0.02% per °C Ripple/Noise (20MHz BW) ➄ 60mVp-p typical, 85mVp-p maximum Line/Load Regulation ±0.25% maximum/±0.5% maximum Efficiency 91% typical, 87% minimum Current Limiting ➅ Auto-recovery Dynamic Characteristics Transient Response (50% load step) 30µsec to ±1% of final value Switching Frequency 300kHz (±30kHz) Environmental Operating Temperature (Ambient): Without Derating With Derating –40 to +70°C to +100°C ( Straight line to 0 Watts) Storage Temperature –40 to +105°C These are stress ratings. Exposure of devices to any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifications Table is not implied. On/Off Control Functionality The On/Off Control pin has an internal 10k pull-up resistor to +VIN. It can be driven with any logic circuit capable of meeting the following drive requirements. Logic "0" = 0 to +0.8V. Logic "1" = +2.0V to +VIN. IIH (@VIN = +2.0V) = –1.2mA. IIL (@VIN = 0V) = –1.4mA. Open collector logic or a single NPN drive transistor can be used. The drive circuit should be rated for more than 13.6V. Applying a voltage to pin 3 when no input power is applied to the converter can cause permanent damage to the converter. M E C H A N I C A L 2.00 (50.80) Case C13 METAL CASE 0.48 (12.19) 2" x 1" x 0.48" (51 x 25 x 12.2mm) Shielding 5-sided Case Connection Pin 2 (Input Return) Case Material Corrosion resistant steel with non-conductive, epoxy-based, black enamel finish and plastic baseplate Pin Material 1.6 ounces (45.4 grams) Flammability UL 94V-0 1.800 (45.72) 0.10 (2.54) 4 1 0.600 (15.24) 2 5 0.400 (10.16) 3 6 0.400 (10.16) 1.00 0.800 (20.32) (25.40) BOTTOM VIEW 0.10 (2.54) 0.10 (2.54) DIMENSIONS ARE IN INCHES (MM) I/O Connections RoHS: Gold plate over copper alloy Non-RoHS: Pure tin over copper alloy Weight INSULATED BASE 0.040 ±0.002 DIA. (1.016 ±0.051) 0.20 MIN (5.08) Physical Dimensions S P E C I F I C A T I O N S Pin 1 2 3 4 5 6 Function P21 +Input Input Return On/Off Control +Output Output Return Trim Note: The case is connected to pin 2 (Input Return). O R D E R I N G I N F O R M AT I O N UNR-5/5-D12 UNR-5/5-D12-C Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. ISO 9001 and 14001 REGISTERED Non-Isolated, 12V-to-5V, 25 Watt, DC/DC Converter RoHS version This product is subject to the following operating requirements and the Life and Safety Critical Application Sales Policy: Refer to: http://www.murata-ps.com/requirements/ Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. © 2013 Murata Power Solutions, Inc. www.murata-ps.com/support UNR25-50W.C01 Page 2 of 2