Details, datasheet, quote on part number: UNR-1.5/20-D5
CategoryPower Management => DC-DC Converters
DescriptionDC/DC Power Converters
CompanyDatel, Inc.
DatasheetDownload UNR-1.5/20-D5 datasheet
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Features, Applications


Output: Non-isolated @ 20 Amps or 20 Amps Input Voltage: 4.75-5.5V (5V nominal) Package: x 0.49" open-frame with attached heat sink Full synchronous-rectifier topology Efficiencies as high as 91% Noise as low as 75mVp-p Stable no-load operation Excellent thermal derating Output short-circuit protection On/off control, trim and sense functions UL60950/EN60950 certified Qual tested, HALT tested, EMI tested

DATEL's 30-66W UNR Series deliver an excellent solution to situations in which users of modern DSP's and CPLD's requiring to 20 Amps of "low-voltage" (1.5-3.3V) current are constrained to drawing that power from a legacy 5V bus. These are non-isolated DC/DC converters that deliver to 20 Amps of 1.5-3.3V current from a 5V input. Combining a modern, fully synchronous buck topology with a unique, integrated-metal-technology (IMT) package, the automatically assembled 30-66W UNR's deliver high efficiency (to 91%), excellent thermal performance (to +70C with 100lfm air flow), and low cost. These converters require no compromises. They are fully line (0.1%) and load (0.5%) regulated and feature low noise (typically 75mVp-p) and quick step response (50msec). Their feature set includes VOUT trim capability, an on/off control function, output remote-sense pins, and output overcurrent detection and shortcircuit protection ("hiccup" technique with auto-recovery). Their unique package integrates an anodized aluminum heat sink with the circuit's thermal-clad aluminum baseplate. With minimal air flow (100lfm), all models deliver full output power/current to +65C. All UNR 30-66W Open-Frame DC/DC Converters are UL1950/EN60950 certified. Safety certifications, EMC compliance test reports, and qualification (including HALT) test reports are available upon request.


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 otherwise noted. All models are tested and specified with a 22F output capacitor with a 200m ESR and a 4000F input capacitor with 9.75Arms ripple-current rating and 20m ESR. See I/O Filtering and Noise Reduction for more details.

Ripple/Noise (R/N) is tested/specified over a 20MHz bandwidth. Output noise may be further reduced by installing additional external output caps. See I/O Filtering and Noise Reduction. These devices have no minimum-load requirements and will regulate under no-load conditions. Nominal line voltage, no-load/full-load conditions.

Output Configuration: U = Unipolar Non-Isolated Nominal Output Voltage: or 3.3 Volts Maximum Rated Output Current in Amps Input Voltage Range: to 5.5 Volts (5V nominal)

I/O Connections Pin Function P26 Trim Sense +Sense +Output Output Return On/Off Control +Input Input Return

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

Input Voltage: Continuous Transient (100msec) Input Reverse-Polarity Protection Input/Output Overvoltage Protection Output Current

Input Voltage Range Input Current: Normal Operating Conditions Standby/Off Mode Input Ripple Current: UNR-3.3/15-D5 UNR-3.3/20-D5 Input Filter Type Overvoltage Protection Reverse-Polarity Protection On/Off Control (Pin to 5.5 Volts (5V nominal) See Ordering Guide TBD 100mAp-p 150mAp-p Capacitive (74F) None On = open +4V to +VIN; IIN = TBD Off to 1V; IIN = TBD

5 Volts 7 Volts None Current limited. Devices can withstand a sustained output short circuit without damage. +105C +300C

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.

VOUT Accuracy (50% load) VOUT Trim Range (3.3VOUT models): Trim pin tied to +Output Trim pin tied to Output Return Minimum Loading Temperature Coefficient Ripple/Noise (20MHz BW) Line/Load Regulation Efficiency Overcurrent Protection: Technique 15 Amp Models 20 Amp Models Average Output Current Transient Response to 75% step) Start-Up Time: VIN to VOUT On/Off to VOUT Switching Frequency Operating Temperature (Ambient): Without Derating With Derating Storage Temperature Dimensions Shielding Attached Heatsink Circuit Board Pin Material Weight 1% maximum VOUT = <1.53 Volts VOUT = >3.6 Volts No load 0.02% per C See Ordering Guide See Ordering Guide See Ordering Guide "Hiccup" with auto-recovery 173% (160% typical) 130% (120% typical) 1 Amp typical, 3 Amps maximum

Return Current Paths These are non-isolated DC/DC converters. The Input Return and Output Return pins are connected to each other internally. To the extent possible, all input and load currents should be returned through the Input Return and Output Return, respectively (via low-impedance runs). Any control signals applied to the On/Off Control pin should be referenced to Input/Output Return.

All models in the UNR 30-66W Series are tested and specified with an external 22F output capacitor (200m ESR) and a 4000F input capacitor with a 9.75Arms ripple-current rating. External input capacitance is required and must be rated to handle the input ripple current as follows:

(The large value of the input capacitor is due mainly to output characteristics of DATEL's outgoing ATE test system. Ripple current rating is an important consideration for the end user.) In critical applications, input/output ripple/ noise may be further reduced by installing additional I/O caps. External input capacitors serve primarily as energy-storage elements. They should be selected for bulk capacitance (at appropriate frequencies), low ESR, and high rms-ripple-current ratings. The switching nature of modern DC/DC converters requires that dc input voltage sources have low ac impedance, and highly inductive source impedances can affect system stability. Your specific system configuration may necessitate additional considerations. Output ripple/noise (also referred to as periodic and random deviations or PARD) can be reduced below specified limits using filtering techniques, the simplest of which is the installation of additional external output capacitors. Output capacitors function as true filter elements and should be selected for bulk capacitance, low ESR, and appropriate frequency response. Any scope measurements of PARD should be made directly at the DC/DC output pins with scope probe ground less than 0.5" in length.

x 12.45mm) Open-frame Black anodized aluminum Single-layer conductors on aluminum base Brass, solder dip alloy 1.7 ounces (48.2 grams)

All models are tested and specified with a 22F output capacitor with a 200m ESR and a 4000F input capacitor with 9.75Arms ripple-current rating and 20m ESR. See I/O Filtering and Noise Reduction for more details. These devices have no minimum-load requirements and will regulate under no-load conditions. See Output Overcurrent Detection for details. See On/Off Control for details. See Output Voltage Trimming for details. See Start-Up Time for details. See Temperature Derating for details.


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