Details, datasheet, quote on part number: UNR-2.5/12-D5
CategoryPower Management => DC-DC Converters => Single Output
DescriptionSingle Output Unr Series Non-isolated, 5v-to-2.5v 12 Amp, DC/DC Converters
CompanyDatel, Inc.
DatasheetDownload UNR-2.5/12-D5 datasheet
Find where to buy


Features, Applications


Low cost! to +5.5V input (25mV), 12 Amp output 200kHz, synchronous-rectifier topology High efficiency, 87% Low output noise, 40mVp-p Quick transient response, to +50C operation with no derating Highly reliable, 100% SMT construction Remote on/off control Output short-circuit protection x 2" metal package; EMC compliant IEC950/EN60950/UL1950 pending Modifications and customs for OEM's

As supply voltages trend lower and load currents increase, centralized power becomes more impractical. The tight accuracy, low noise and quick transient response demanded by today's low-voltage CPU's, ASIC's and DSP's make power processing at the "point of use" the only viable solution. As voltages decrease much below 3.3V, the task of designing your own circuit to efficiently derive low-voltage power from higher-voltage buses 12V, 48V, etc.) becomes significantly more challenging. When you are designing power-hungry 2.5V partitions or boards, consider DATEL's new UNR-2.5/12-D5. This non-isolated, 5V-to-2.5V DC/DC delivers a full 12 Amps at an impressive 87% efficiency. Packaged x 0.44" metal case, the converter exploits synchronous rectification, planar magnetics and 100% automatic SMT assembly to bring you an incomparable 30 Watts of 2.5V power. The UNR-2.5/12-D5 delivers full power over the to +50C temperature range without heat sinking or forced-air cooling. It is fully line (0.1%) and load (0.5%) regulated and features low noise (40mVp-p) and quick (30sec) transient response. The unit offers remote on/off control, and it can withstand a sustained output short circuit with full recovery to rated accuracy. Designing your own 2.5V step-down buck regulator may be practical for lowpower applications. When you need 12 Amps, the task becomes significantly more time consuming. Consider that the high efficiency, ease-of-use, and overall cost effectiveness of DATEL's new 2.5V UNR Series make the quick solution the best solution.


Signals applied to the On/Off Control are referenced to Logic Ground which is internally connected to Input/Output Return. The Logic Ground pin is not designed to carry heavy current. Do not install units with the Return pins open or connected via high-impedance runs.

DATEL, Inc., Mansfield, MA 02048 (USA) Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 Email: Internet:

Typical = +25C under nominal line voltage and full-load conditions, unless noted.

Input Voltage Output Current 7 Volts Current limited. Devices can withstand a sustained output short circuit without damage. +105C +300C

Input Voltage Range Input Current Input Filter Type Overvoltage Protection Reverse-Polarity Protection On/Off Control (Pin 2) VOUT Accuracy (50% load) Temperature Coefficient Ripple/Noise (20MHz BW) Line/Load Regulation Efficiency Current Limiting Transient Response (50% load step) Switching Frequency Operating Temperature (Ambient): Without Derating With Derating Storage Temperature Dimensions Shielding Case Connection Case Material 4.75-5.5 Volts (5V nominal) 0.15/6.9 Amps Capacitive None TTL high (or open) = on, low = off

Storage Temperature Lead Temperature (soldering, 10 sec.)

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.

1% (25mV) maximum 0.02% per C 40mVp-p typical, 80mVp-p maximum 0.1% maximum/0.5% maximum 87% typical, 84% minimum Auto-recovery

The On/Off Control pin has an internal 5kW pull-up resistor to +VIN. It can be driven with any logic circuit capable of meeting the following drive requirements. Logic to +0.8V. Logic +2.0V to +VIN. IIH (@VIN = 0.7mA. IIL (@VIN = 1.1mA. Open collector logic or a single NPN drive transistor can be used. The drive circuit should be rated for more than 5.5V. Applying a voltage to pin 2 when no input power is applied to the converter can cause permanent damage to the converter.

11.2mm) 5-sided Pin 5 (Input Return) Corrosion resistant steel with non-conductive, epoxy-based, black enamel finish and plastic baseplate Brass, solder coated 1.6 ounces (45.4 grams)

These devices have no minimum load requirements and will regulate under no-load conditions. Achieving specified performance requires the installation of an external 470F input capacitor with an ESR of 20mW and an rms ripple current rating of 6 Amps, as well as an external 22F output capacitor with an ESR 200mW or less. No-load/full-load conditions. When the unit is off, the input "standby" current is typically 10mA. See On/Off Control Functionality. Output noise may be reduced by installing additional external capacitors across the output terminals. Caps should be selected for low ESR (typically 60mW) and located as close to the unit as possible. Current limiting initiates at approximately 30% above rated load. Under short-circuit conditions, output current folds back to approximately 1A and remains there until the short is removed.

I/O Connections Pin Function P9 Logic Ground On/Off Control +Output Output Return Input Return +Input

DATEL, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 Tel: Fax: (508) 339-6356 Internet: Email: Data Sheet Fax Back: (508) 261-2857

DATEL (UK) LTD. Tadley, England Tel: (01256)-880444 DATEL S.A.R.L. Montigny Le Bretonneux, France Tel: 01-34-60-01-01 DATEL GmbH Mnchen, Germany Tel: 89-544334-0 DATEL KK Tokyo, Japan Tel: 3-3779-1031, Osaka Tel: 6-354-2025

DATEL 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. The DATEL logo is a registered DATEL, Inc. trademark.

UNR, 5W UNR, 20/25W UNR, 20/25W UNR, 20/25W UNR, 20/25W UNR, 30W Contact DATEL

Listed specifications are typical = +25C under nominal line voltage and full-load conditions, unless noted. See individual product data sheets for mechanical specifications and pinouts. Ripple/Noise is specified over a 20MHz bandwidth. Listed specifications for these products are preliminary. 10-pin SIP package. 10-pin DIP package. Listed specification is a typical. Output voltage is user adjustable from to 6V. Output voltage is user adjustable from to 3.6V. Industry-standard, 11-pin SIP package.

Data sheet fax back: (508)261-2857 Visit us on the internet:

DATEL, Inc., Mansfield, MA, USA Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 Email:


Some Part number from the same manufacture Datel, Inc.
UNR-2.5/15-D5 DC/DC Power Converters
UNR-3.3/10-D5 Single Output Unr Series Non-isolated, 5v-to-3.3v 8 And 10 Amp, DC/DC Converters
UNR-3.3/10-D5SM DC/DC Power Converters
UNR-3.3/12-D5 Non-isolated, 5v-to-3.3v 12 Amp, DC/DC Converters
UNR-3.3/12000-D5 3.3V Non-isolated, 8-40W, Single Output DC/DC Converter
UNR-3.3/15-D5 DC/DC Power Converters
UNR-3.3/2500-D12 3.3V Non-isolated, 8-40W, Single Output DC/DC Converter
UNR-3.3/3-D12 DC/DC Power Converters
UNR-3.3/3000-D5 3.3V Non-isolated, 8-40W, Single Output DC/DC Converter
UNR-3.3/8-D12SM DC/DC Power Converters
UNR-3.3/8-D5 Single Output Unr Series Non-isolated, 5v-to-3.3v 8 And 10 Amp, DC/DC Converters
UNR-3.3/8-D5SM DC/DC Power Converters
UNR-3.3/8000-D5 3.3V Non-isolated, 8-40W, Single Output DC/DC Converter
UNR-5/10-D12 DC/DC Power Converters
UNR25-50W DC/DC Power Converters

ADS-941 : 1mhz Sampling ADC: 14-bit

DM-31-1 : Digital Panel Meters Digital Panel Meters

DMS-20PC-1 : Digital Panel Meters

DMS-20PC-1-FM : Segment Displays

DVME-691A/D : Boards->Data Acquisition

LSN-3.3/10-D5 : DC/DC Power Converters

TWR-5/1000-12/210-D24A : 5V 8-11W, Triple Output DC/DC Converter

ULQ-1.2/15-D48 : DC/DC Power Converters

UNR-3.3/12-D5 : Non-isolated, 5v-to-3.3v 12 Amp, DC/DC Converters

UWP-5/500SERIES : 3w, DC/DC Converter

UWR-15/335-D24 : 12V Miniature, 5W, DC/DC Converter

Same catergory

5962-0051401QPA : MOSFET and Power Drivers. ti UC1708, Non-inverting High Speed Power Drivers.

AMS1085 : 3a Low Dropout Voltage Regulator. Three Terminal Adjustable or Fixed Voltages 3.3V, 3.5V and 5.0V Output Current of 3A Operates Down to 1V Dropout Load Regulation: 0.1% Line Regulation: TO-220, TO-263 and TO-252 packages available APPLICATIONS High Efficiency Linear Regulators Post Regulators for Switching Supplies Microprocessor Supply Battery Chargers Constant Current Regulators Notebook/Personal.

L295 : Power Controllers & Motor Drivers. Dual Switch-mode Solenoid Driver. HIGH CURRENT CAPABILITY (up to 2.5A per channel) HIGH VOLTAGE OPERATION (up to 46V for power stage) HIGH EFFICIENCY SWITCHMODE OPERATION REGULATED OUTPUT CURRENT (adjustable) FEW EXTERNAL COMPONENTS SEPARATE LOGIC SUPPLY THERMAL PROTECTION trolled by means of a switch-ing technique allowing very efficient operation. Furthermore, it includes an enable.

LT1004-1.2 : Micropower Integrated Voltage References. Initial Accuracy 4 mV for 20 mV for LT1004-2.5 Micropower Operation Operates 20 mA Very Low Reference Impedance Applications: Portable Meter Reference Portable Test Instruments Battery-Operated Systems Current-Loop Instrumentation No internal connection Terminals 6 and 8 are internally connected. LP PACKAGE (TOP VIEW) The LT1004 micropower.

LT1019ACN8-10 : 10V. LT1019ACN8-10, Precision References. Tight Initial Output Voltage: < 0.05% Ultralow Drift: 3ppm/C Typical Series or Shunt Operation Curvature Corrected Ultrahigh Line Rejection: 0.5ppm/V Low Output Impedance: 0.02 Plug-In Replacement for Present References Available 4.5V, 5V, and 10V 100% Noise Tested Temperature Output Industrial Temperature Range in SO-8 The is a third generation.

LT1585A : 5a Low Dropout Fast Response Positive Adjustable And Fixed Voltage Regulator.

PKM4000CR1A : DC/DC Converter. New Industry Standard Footprint and Pin-Out with option for or 4 output pins Low profile, x 0.34 in) Cost efficient open-frame with optional baseplate High Efficiency, 89% typical at 1.8V out 2,250 Vdc isolation and meets isolation requirements equivalent to Basic Insulation according to IEC/EN/UL 60950 The New PKM 4000C series of high power high efficiency.

PT5110 : Non-Isolated DC-DC Converters. 90%+ Efficiency Internal Short-Circuit Protection Pin-Compatible with 3-Terminal Linear Regulators Laser-Trimmed Output Voltage Over-Temperature Protection Small Footprint Wide Input Range 5-Pin Mount Option (Suffixes & M) The PT5100 modules are a series of economical, easy-to-use 1-A positive step-down, Integrated Switching Regulators (ISRs). These.

TL851 : Digital Intergrated Circuit.

TPS2046A : . 80-m High-Side MOSFET Switch 250 mA Continuous Current Per Channel Independent Thermal and Short-Circuit Protection With Overcurrent Logic Output Operating Range. 5.5 V CMOS- and TTL-Compatible Enable Inputs 2.5-ms Typical Rise Time Undervoltage Lockout 10 A Maximum Standby Supply Current for Single and Dual (20 A for Triple and Quad) Bidirectional.

UCC2580D-3 : Soft Switching. ti UCC2580-3, Single Ended Active Clamp/reset PWM. Provides Auxiliary Switch Activation Complementary to Main Power Switch Drive Programmable deadtime (Turn-on Delay) Between Activation of Each Switch Voltage Mode Control with Feedforward Operation Programmable Limits for Both Transformer Volt- Second Product and PWM Duty Cycle High Current Gate Driver for Both Main and Auxiliary Outputs Multiple Protection.

UCC28085D : Current Mode. ti UCC28085, Current Mode Push-pull PWM With Programmable Slope Compensation.

UCC28220D : Current Mode. ti UCC28220, Dual Interleaved PWM Controller With Programmable Max Duty Cycle.

CM3004 : 1.0 Amp Dual Mode Low-Dropout CMOS Regulator The CM3004 is a very-low-dropout regulator that offers both fixed output and fixed/adjustable operating modes. When the Adjust control pin (ADJ) is grounded, this device automatically enters a fixed voltage mode delivering 2.5V out at 1.0A. When the Adjust pin is connected to an external resistor network.

CAT3647 : 3-Channel Ultra High Efficiency Quad-Mode?? LED Driver With 32 Dimming Levels The CAT3647 is a high efficiency quad-mode fractional charge pump that can drive up to three LEDs programmable by a one wire digital interface. The inclusion of a 1.33x fractional charge pump mode increases device efficiency by up to 10% over traditional 1.5x charge pumps.

AS1362 : 300mA 9 Vrms Ultra-Low-Noise, 92dB High-PSRR LDO With Power-Ok The AS1361/AS1362 are ultra-low-noise, low-dropout linear regulators specifically designed to deliver up to 150/300mA continuous output current, and can achieve a low 140mV dropout for 300mA load current. The LDOs are designed and optimized to work with low-cost, small-capacitance ceramic.

PT7M7343JTA : P Supervisor Circuits The PT7M7xxx family microprocessor (P) supervisory circuits are targeted to improve reliability and accuracy of power-supply circuitry in P systems. These devices reduce the complexity and number of components required to monitor power-supply and battery functions..

MAX6332 : 3-Pin, Ultra-Low-Voltage, Low-Power P Reset Circuits The MAX6332/MAX6333/MAX6334 microprocessor (P) supervisory circuits monitor the power supplies in 1.8V to 3.3V P and digital systems. They increase circuit reliability and reduce cost by eliminating external components and adjustments. These devices perform a single function: they assert a reset.

0-C     D-L     M-R     S-Z