|Category||Power Management => DC-DC Converters|
|Description||DC/DC Power Converters|
|Datasheet||Download UNR-1.8/10-D3SM datasheet
3.0-3.6V input range; Non-isolated or 2.5V output x 1" through-hole or SMT package Gull-wing leads/standard reflow for SMT Full synchronous-rectifier topology 300kHz switching; Planar magnetics High efficiency, to 89% Low noise, 80mVp-p Quick transient response, 25µsec VOUT user-trimmable from to +50/55°C ambient operation with no derating Remote on/off control; Output overcurrent detection IEC950/EN60950/UL1950 pending EMC compliant
If your DSP and CPLD core logic are demanding more or 2.5V current from your 3.3V system, don't pay to derive more isolated power from your intermediate dc bus. DATEL's new, 3.3V-input, UNR "D3" models derive 10 Amps of low-voltage current right from your 3.3V supply. These non-isolated power converters exploit full synchronous rectification, planar magnetics, and 100% automated assembly to deliver high efficiencies (to 89%), low noise (typically 80mVp-p), and low costs. Housed x 2" shielded metal cases, UNR D3's offer standard through-hole ("T" models) or SMT ("SM" models) packaging. The new "gull-wing" SMT packages (with metal shells and non-conductive plastic baseplates) weigh less than 40 grams and can withstand peak temperatures to +235°C. They are compatible with most contemporary pick-and-place and solder-reflow processes. These versatile DC/DC's are fully line (±0.1% max.) and load (±0.5% max.) regulated. They feature quick transient response (25µsec), user-optional on/off control (for power sequencing), and output overcurrent detection and shutdown ("hiccup" technique with auto-recovery). Their impressive guaranteed efficiencies enable them to deliver fully rated output power from to +50/55°C (ambient) without supplemental cooling. If your high current requirements have made the use of inefficient linear regulators impractical, take a look at one of DATEL's new switching buck regulators. Their high efficiency, ease-of-use, long-term reliability, and overall cost effectiveness will impress you. Safety agency approvals and EMC characterizations are currently in progress.
DATEL, Inc., Mansfield, MA 02048 (USA) Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 Email: firstname.lastname@example.org Internet: www.datel.com
Typical = +25°C under nominal line voltage and full-load conditions, unless otherwise noted. All models are tested and specified with an external 470µF input capacitor with a 20m ESR and a 6Arms ripple-current rating, as well a 22µF output capacitor with a 200m 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.INSULATED BASE BOTTOM VIEW DIMENSIONS IN INCHES (MM) 0.10 (2.54) METAL CASE
I/O Connections Pin Function P23 Logic Ground On/Off Control +Output Trim Output Return Input Return +Input No Pin No Pin Function P25 Logic Ground On/Off Control N.C. +Output Trim Output Return Input Return +Input
Output Configuration: U = Unipolar Non-Isolated Nominal Output Voltage: or 2.5 Volts Packaging: T = Through-Hole Package SM = Surface-Mount Package Input Voltage Range: to 3.6 Volts (3.3V nominal)See Temperature Derating section in Technical Notes for more details.
Typical = +25°C under nominal line voltage and full-load conditions unless noted.
Input Voltage Range Input Current: Normal Operating Conditions Standby/Off Mode Output Short Circuited Input Ripple Current: UNR-1.8/10-D3 UNR-2.5/10-D3 Input Filter Type Overvoltage Protection Reverse-Polarity Protection On/Off Control to 3.6 Volts (3.3V nominal) See Ordering Guide 3.6mA typical, 8mA maximum 500mA typical, 700mA maximum 150mAp-p 50mAp-p Capacitive None On = open 2V to +VIN; IIN = 800µA max. Off = 0-0.8V; IIN = 1.2mA max.
All models are tested and specified with an external 470µF input capacitor with a 20m ESR and a 6Arms ripple-current rating, as well a 22µF output capacitor with a 200m 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. Listed specifications apply for both "T" and "SM" models as appropriate. See Output Overcurrent Detection for details. See On/Off Control for details. See Output Voltage Trimming for details. For all models, output noise can be further reduced with the installation of additional external output capacitors. See I/O Filtering and Noise Reduction for details. Output overcurrent detection initiates at approximately 40% above rated load (14 Amps). Under overload or short-circuit conditions, output current "hiccups" at approximately 1 Amp average and remains at that level until the overload is removed. See Output Overcurrent Detection. See Start-Up Time for details. See Temperature Derating for details.
Input Voltage: Continuous Transient (100msec) Input Reverse-Polarity Protection Input/Output Overvoltage Protection Output Current
5 Volts 6.3 Volts None Current limited. Devices can withstand a sustained output short circuit without damage. +105°C +300°C
VOUT Accuracy (50% load): UNR-1.8/10-D3 UNR-2.5/10-D3 VOUT Trim Range Trim pin tied to +Output: UNR-1.8/10-D3 UNR-2.5/10-D3 Trim pin tied to Output Return Temperature Coefficient Ripple/Noise (20MHz BW) Line/Load Regulation Efficiency Overcurrent Protection: Technique Overcurrent Detection Point Average Output Current Transient Response (50%-75% step) Start-Up Time: VIN to VOUT On/Off to VOUT Switching Frequency Operating Temperature (Ambient): Without Derating With Derating Storage Temperature Dimensions: Through-Hole Models Surface-Mount Models Shielding Case Connection Case Material ±1% (±15mV) maximum ±1% (±18mV) maximum ±1% (±25mV) maximum
Storage Temperature Lead Temperature (Soldering, 10 sec.) VOUT = 1.28 Volts or less VOUT = 1.52 Volts or less VOUT = 3.0 Volts or greater ±0.02% per °C See Ordering Guide See Ordering Guide See Ordering Guide "Hiccup" with auto-recovery 140% of rated current 1 Amp typical, 3 Amps maximum ±2.5% of final value 25/30msec (1.8/2.5VOUT models) 25/30msec (1.8/2.5VOUT models) 300kHz (±30kHz)
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.
Return Current Paths These are non-isolated DC/DC converters. The Input Return, Output Return and Logic Ground pins are all connected together 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 Logic Ground. The internal trace leading to Logic Ground is not designed to carry high current. Consequently, devices should never be installed in a manner that results in high current flow through Logic Ground (i.e., the Input/Output Return pins should never be left open or connected via high-impedance paths).
10.9mm) 5 sided Input/Output Return Corrosion-resistant steel with non-conductive,epoxy-based,black enamelfinishandplasticbaseplate Copper, tin plated 1.4 ounces (39.7 grams)
All UNR 15-25W Series converters are tested and specified with external 470µF input capacitors (20m ESR, 6Arms ripple-current rating) and external 22µF output capacitors (200m ESR). External input capacitance is required and must be rated to handle the input ripple current as follows:
In critical applications, input/output ripple/noise may be further reduced by installing additional I/O caps.
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