|Category||Power Management => DC-DC Converters => Single Output|
|Description||Non-isolated, 5v-to-3.3v 12 Amp, DC/DC Converters|
|Datasheet||Download UNR-3.3/12-D5 datasheet
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 +50°C 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 +50°C 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 (30µsec) 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: email@example.com Internet: www.datel.comTypical = +25°C 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. +105°C +300°C
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 Overcurrent Detection Point 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 = offStorage 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 ±1% of final value 200kHz (±20kHz)
The On/Off Control pin has an internal 5k 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 470µF input capacitor with an ESR of 20m and an rms ripple current rating of 6 Amps, as well as an external 22µF output capacitor with an ESR 200m 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. Overcurrent detection initiates at approximately 30% above rated load, where the output current "hiccups" at an overage current of 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
Low cost! to +5.5V input (±33mV), 12 Amp output 200kHz, synchronous-rectifier topology High efficiency, 90% Low output noise, 40mVp-p Quick transient response, to +50°C 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'st
As 3.3V CPU's, DSP's and PLD's proliferate and low-voltage currents increase, the shortcomings of both traditional centralized power architectures and the recently introduced 3.3V outputs on AC/DC converters become more apparent. The solution is to locally derive 3.3V power from buses of higher voltage 12V, 48V, etc.). "Point-of-use" power processing is the only way to guarantee the tight accuracy, low noise, and quick transient response required by these new devices. If you are designing power-hungry 3.3V partitions or boards, consider DATEL's new UNR-3.3/12-D5. These non-isolated, 5V-to-3.3V DC/DC's deliver to 12 Amps. Packaged x 0.44" metal cases, these converters use synchronous rectification, planar magnetics, and 100% automatic SMT assembly to bring you the most cost-effective 3.3V power. The 90% efficient UNR-3.3/12-D5 delivers its full 40W output power from to +50°C without heat sinking or forced-air cooling. It is fully line (±0.1% max.) and load (±0.5% max.) regulated and features a TTL-compatible on/off control. These devices can withstand a sustained output short circuit and automatically recover to rated accuracy. Designing your own 3.3V step-down buck regulator may be practical for lowpower applications. When you need 12 Amps, the task becomes significantly more challenging and time consuming. It's time to consider the high efficiency, ease-ofuse, and overall cost effectiveness of DATEL's UNR Series. Safety agency approvals and full EMI characterizations are currently in progress.
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