Details, datasheet, quote on part number: UNR-3.3/12000-D5
CategoryPower Management => DC-DC Converters
Description3.3V Non-isolated, 8-40W, Single Output DC/DC Converter
CompanyDatel, Inc.
DatasheetDownload UNR-3.3/12000-D5 datasheet
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Features, Applications


Low cost or 12V inputs 3.3V±1% (±33mV) outputs ±0.25% (±8mV) max. line regulation ±0.5% (±17mV) max. load regulation Guaranteed efficiencies to 86% Power densities to 29W/in3 High output current... small packages: x 1" package) x 1" package) No heat sinks required to +100oC operating temperatures On/off/sync control UL, CSA, IEC safety approvals

New low-voltage microprocessor and memory chips are driving the migration from centralized to distributed power processing in modern telecommunication and computer systems. Powering these new chips requires local, on-board power converters that rapidly source large amounts of current while maintaining accurate voltages with minimal ripple and noise. The distribution losses, unpredictable regulation and poor transient response of traditional centralized power systems are no longer acceptable. Power processing at the "point-of-use" is frequently the only way to achieve desired performance. DATEL's new UNR Series of non-isolated, 3.3V output, or 12V input, switching DC/DC converters were specifically designed for on-board usage in today's mixedlogic 5V/3.3V systems. They also support those systems that are already drawing maximum current from their 5V buses and must resort to their 12V buses. These low-cost, extremely efficient (typically 90%) power converters are capable of delivering full rated output currents (2.5-12 Amps) while maintaining low case temperatures without the need for heat sinks or any auxiliary cooling. UNR Series devices combine proven circuit architectures, contemporary SMT-on-ceramic and SMT-on-pcb assembly techniques, and a new thermally-conductive potting compound to achieve high output power in the smallest packages possible. DATEL is currently developing UNR Series devices that incorporate active load sharing with output current/voltage-sensing capabilities. We can also quickly modify existing devices for application-specific output voltages from to 5 Volts. Please contact us with your unique requirements... we may already have the product you need. DATEL also makes a complete line of isolated 3.3V DC/DC converters that operate from wide-range input voltages from to 72V.

DATEL, Inc., 11 Cabot Boulevard, Mansfield, MA 02048 (U.S.A.) Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 Email:

Typical = +25°C under nominal line voltage and full load conditions unless otherwise noted. These devices require external input and output capacitors for normal operation. 20MHz bandwidth. Specified with external I/O capacitors. See Technical Notes. to 100% load. Nominal line voltage, no load/full load conditions. Model is no longer available. Use DATEL model UNR-3.3/12-D5 for replacement.

Output Configuration: U = Unipolar Non-Isolated Nominal Output Voltage: 3.3 Volts Maximum Output Current in mA Input Voltage Range: = 4.75-5.5 Volts (5V nominal) = 10.8-13.2 Volts (12V nominal)

I/O Connections Function P9 Function P10 Logic Gnd. Do Not Connect On/Off Control No Connect +Output Output Rtn. Output Rtn. Input Rtn. Input Rtn. +Input

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

Input Voltage Range: "D5" Models "D12" Models Input Current Input Filter Type Overvoltage Shutdown Reverse-Polarity Protection On/Off (Sync.) Control (Pin 2) 4.75-5.5 Volts (5V nominal) 10.8-13.2 Volts (12V nominal) See Ordering Guide None Yes (Instantaneous, 10A maximum) TTL high = off, low (or open) = on Output VOUT Accuracy (50% load) Temperature Coefficient Ripple/Noise (20MHz BW) Line/Load Regulation Efficiency Current Limiting ±1% ±0.02% per °C See Ordering Guide See Ordering Guide See Ordering Guide Auto-recovery Dynamic Characteristics Transient Response (25% load step) Switching Frequency: "D5" Models "D12" Models ±1.5% of final value

Absolute Maximum Ratings 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. Storage temperatures have been verified for 168 hours.

Input Voltage: "D5" Models "D12" Models Input Reverse-Polarity Protection Output Overvoltage Protection Output Current

7 Volts 15 Volts Current must be <10A. Brief duration. Fusing recommended. None Current limited. Max. current and short-circuit duration model dependent. +105°C +300°C

Operating Temperature (ambient): Without Derating: 8A "D5" Models 12A "D5" and 2.5A "D12" Models With Derating Storage Temperature

Physical Dimensions: 3A "D5" and 2.5A "D12" Models 8A "D5" Model Shielding Case Connection Case Material Pin Material Weight: 3A "D5" and 2.5A "D12" Models 8A "D5" Model 11.4mm) 5-sided Pin 4 (Output Return) Corrosion resistant steel with epoxy-based enamel finish Brass, solder coated 1 ounce (28.4 grams) 1.5 ounces (42.5 grams)

These power converters require a minimum 10% loading to maintain specified regulation. Operation under no-load conditions will not damage these devices, however, they may not meet all listed specifications. These power converters do not have internal input filters and do require external input and output capacitors to achieve rated specifications. Application-specific internal input/ output filtering can be added upon request. Contact DATEL for details. On/Off Control pins are included on "D5" models only. See Technical Notes for details. Applying a voltage to the Control pin when no input power is applied to the converter can cause permanent damage to the converter. Cases can be provided with 6-sided shielding. Contact DATEL for details.


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